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<?xml version="1.0" encoding="utf-8" ?>
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<title>Core</title>
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<div class="document" id="core">
<div id="container">
<div id="headerNav">
<ul>
<li class="first"><a href="/">Home</a></li>
<li><a href="../../products.html">Products</a></li>
<li><a href="../../contact.html">Contact</a></li>
</ul>
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<div id="main">
<h1 class="title">Core</h1>
<table class="docinfo" frame="void" rules="none">
<col class="docinfo-name" />
<col class="docinfo-content" />
<tbody valign="top">
<tr><th class="docinfo-name">Author:</th>
<td>Arvid Norberg, <a class="last reference external" href="mailto:arvid&#64;rasterbar.com">arvid&#64;rasterbar.com</a></td></tr>
<tr><th class="docinfo-name">Version:</th>
<td>1.0.0</td></tr>
</tbody>
</table>
<div class="contents topic" id="table-of-contents">
<p class="topic-title first">Table of contents</p>
<ul class="simple">
<li><a class="reference internal" href="#disk-buffer-holder" id="id166">disk_buffer_holder</a></li>
<li><a class="reference internal" href="#peer-info" id="id167">peer_info</a></li>
<li><a class="reference internal" href="#peer-request" id="id168">peer_request</a></li>
<li><a class="reference internal" href="#block-info" id="id169">block_info</a></li>
<li><a class="reference internal" href="#partial-piece-info" id="id170">partial_piece_info</a></li>
<li><a class="reference internal" href="#torrent-handle" id="id171">torrent_handle</a></li>
<li><a class="reference internal" href="#torrent-status" id="id172">torrent_status</a></li>
<li><a class="reference internal" href="#announce-entry" id="id173">announce_entry</a></li>
<li><a class="reference internal" href="#torrent-info" id="id174">torrent_info</a></li>
</ul>
</div>
<a name="disk_buffer_holder"></a><div class="section" id="disk-buffer-holder">
<h1>disk_buffer_holder</h1>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/disk_buffer_holder.hpp">libtorrent/disk_buffer_holder.hpp</a>&quot;</p>
<p>The disk buffer holder acts like a <tt class="docutils literal">scoped_ptr</tt> that frees a disk buffer
when it's destructed, unless it's released. <tt class="docutils literal">release</tt> returns the disk
buffer and transferres ownership and responsibility to free it to the caller.</p>
<p>A disk buffer is freed by passing it to <tt class="docutils literal"><span class="pre">session_impl::free_disk_buffer()</span></tt>.</p>
<p><tt class="docutils literal">buffer()</tt> returns the pointer without transferring responsibility. If
this buffer has been released, <tt class="docutils literal">buffer()</tt> will return 0.</p>
<pre class="literal-block">
struct disk_buffer_holder
{
<strong>disk_buffer_holder</strong> (disk_buffer_pool&amp; disk_pool, char* buf);
<strong>~disk_buffer_holder</strong> ();
char* <strong>release</strong> ();
char* <strong>get</strong> () const;
void <strong>reset</strong> (char* buf = 0);
void <strong>swap</strong> (disk_buffer_holder&amp; h);
};
</pre>
<a name="disk_buffer_holder()"></a><div class="section" id="id2">
<h2>disk_buffer_holder()</h2>
<pre class="literal-block">
<strong>disk_buffer_holder</strong> (disk_buffer_pool&amp; disk_pool, char* buf);
</pre>
<p>construct a buffer holder that will free the held buffer
using a disk buffer pool directly (there's only one
disk_buffer_pool per <a class="reference external" href="reference-Session.html#session">session</a>)</p>
<a name="~disk_buffer_holder()"></a></div>
<div class="section" id="id4">
<h2>~disk_buffer_holder()</h2>
<pre class="literal-block">
<strong>~disk_buffer_holder</strong> ();
</pre>
<p>frees any unreleased disk buffer held by this object</p>
<a name="release()"></a></div>
<div class="section" id="release">
<h2>release()</h2>
<pre class="literal-block">
char* <strong>release</strong> ();
</pre>
<p>return the held disk buffer and clear it from the
holder. The responsibility to free it is passed on
to the caller</p>
<a name="get()"></a></div>
<div class="section" id="get">
<h2>get()</h2>
<pre class="literal-block">
char* <strong>get</strong> () const;
</pre>
<p>return a pointer to the held buffer</p>
<a name="reset()"></a></div>
<div class="section" id="reset">
<h2>reset()</h2>
<pre class="literal-block">
void <strong>reset</strong> (char* buf = 0);
</pre>
<p>set the holder object to hold the specified buffer
(or NULL by default). If it's already holding a
disk buffer, it will first be freed.</p>
<a name="swap()"></a></div>
<div class="section" id="swap">
<h2>swap()</h2>
<pre class="literal-block">
void <strong>swap</strong> (disk_buffer_holder&amp; h);
</pre>
<p>swap pointers of two disk buffer holders.</p>
<a name="peer_info"></a></div>
</div>
<div class="section" id="peer-info">
<h1>peer_info</h1>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/peer_info.hpp">libtorrent/peer_info.hpp</a>&quot;</p>
<p>holds information and statistics about one peer
that libtorrent is connected to</p>
<pre class="literal-block">
struct peer_info
{
enum peer_flags_t
{
interesting,
choked,
remote_interested,
remote_choked,
supports_extensions,
local_connection,
handshake,
connecting,
queued,
on_parole,
seed,
optimistic_unchoke,
snubbed,
upload_only,
endgame_mode,
holepunched,
i2p_socket,
utp_socket,
ssl_socket,
rc4_encrypted,
plaintext_encrypted,
};
enum peer_source_flags
{
tracker,
dht,
pex,
lsd,
resume_data,
incoming,
};
enum bw_state
{
bw_idle,
bw_limit,
bw_network,
bw_disk,
};
enum connection_type_t
{
standard_bittorrent,
web_seed,
http_seed,
};
boost::uint32_t flags;
int source;
char read_state;
char write_state;
tcp::endpoint ip;
int up_speed;
int down_speed;
int payload_up_speed;
int payload_down_speed;
size_type total_download;
size_type total_upload;
peer_id pid;
bitfield pieces;
int upload_limit;
int download_limit;
time_duration last_request;
time_duration last_active;
time_duration download_queue_time;
int queue_bytes;
int request_timeout;
int send_buffer_size;
int used_send_buffer;
int receive_buffer_size;
int used_receive_buffer;
int num_hashfails;
char country[2];
std::string inet_as_name;
int inet_as;
size_type load_balancing;
int download_queue_length;
int timed_out_requests;
int busy_requests;
int requests_in_buffer;
int target_dl_queue_length;
int upload_queue_length;
int failcount;
int downloading_piece_index;
int downloading_block_index;
int downloading_progress;
int downloading_total;
std::string client;
int connection_type;
int remote_dl_rate;
int pending_disk_bytes;
int send_quota;
int receive_quota;
int rtt;
int num_pieces;
int download_rate_peak;
int upload_rate_peak;
int progress_ppm;
int estimated_reciprocation_rate;
tcp::endpoint local_endpoint;
};
</pre>
<a name="peer_flags_t"></a><div class="section" id="enum-peer-flags-t">
<h2>enum peer_flags_t</h2>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/peer_info.hpp">libtorrent/peer_info.hpp</a>&quot;</p>
<table border="1" class="docutils">
<colgroup>
<col width="24%" />
<col width="10%" />
<col width="65%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">name</th>
<th class="head">value</th>
<th class="head">description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>interesting</td>
<td>1</td>
<td><strong>we</strong> are interested in pieces from this peer.</td>
</tr>
<tr><td>choked</td>
<td>2</td>
<td><strong>we</strong> have choked this peer.</td>
</tr>
<tr><td>remote_interested</td>
<td>4</td>
<td>the peer is interested in <strong>us</strong></td>
</tr>
<tr><td>remote_choked</td>
<td>8</td>
<td>the peer has choked <strong>us</strong>.</td>
</tr>
<tr><td>supports_extensions</td>
<td>16</td>
<td>means that this peer supports the
<a class="reference external" href="extension_protocol.html">extension protocol</a>.</td>
</tr>
<tr><td>local_connection</td>
<td>32</td>
<td>The connection was initiated by us, the peer has a
listen port open, and that port is the same as in the
address of this peer. If this flag is not set, this
peer connection was opened by this peer connecting to
us.</td>
</tr>
<tr><td>handshake</td>
<td>64</td>
<td>The connection is opened, and waiting for the
handshake. Until the handshake is done, the peer
cannot be identified.</td>
</tr>
<tr><td>connecting</td>
<td>128</td>
<td>The connection is in a half-open state (i.e. it is
being connected).</td>
</tr>
<tr><td>queued</td>
<td>256</td>
<td>The connection is currently queued for a connection
attempt. This may happen if there is a limit set on
the number of half-open TCP connections.</td>
</tr>
<tr><td>on_parole</td>
<td>512</td>
<td>The peer has participated in a piece that failed the
hash check, and is now &quot;on parole&quot;, which means we're
only requesting whole pieces from this peer until
it either fails that piece or proves that it doesn't
send bad data.</td>
</tr>
<tr><td>seed</td>
<td>1024</td>
<td>This peer is a seed (it has all the pieces).</td>
</tr>
<tr><td>optimistic_unchoke</td>
<td>2048</td>
<td>This peer is subject to an optimistic unchoke. It has
been unchoked for a while to see if it might unchoke
us in return an earn an upload/unchoke slot. If it
doesn't within some period of time, it will be choked
and another peer will be optimistically unchoked.</td>
</tr>
<tr><td>snubbed</td>
<td>4096</td>
<td>This peer has recently failed to send a block within
the request timeout from when the request was sent.
We're currently picking one block at a time from this
peer.</td>
</tr>
<tr><td>upload_only</td>
<td>8192</td>
<td>This peer has either explicitly (with an extension)
or implicitly (by becoming a seed) told us that it
will not downloading anything more, regardless of
which pieces we have.</td>
</tr>
<tr><td>endgame_mode</td>
<td>16384</td>
<td>This means the last time this peer picket a piece,
it could not pick as many as it wanted because there
were not enough free ones. i.e. all pieces this peer
has were already requested from other peers.</td>
</tr>
<tr><td>holepunched</td>
<td>32768</td>
<td>This flag is set if the peer was in holepunch mode
when the connection succeeded. This typically only
happens if both peers are behind a NAT and the peers
connect via the NAT holepunch mechanism.</td>
</tr>
<tr><td>i2p_socket</td>
<td>65536</td>
<td>indicates that this socket is runnin on top of the
I2P transport.</td>
</tr>
<tr><td>utp_socket</td>
<td>131072</td>
<td>indicates that this socket is a uTP socket</td>
</tr>
<tr><td>ssl_socket</td>
<td>262144</td>
<td>indicates that this socket is running on top of an SSL
(TLS) channel</td>
</tr>
<tr><td>rc4_encrypted</td>
<td>1048576</td>
<td>this connection is obfuscated with RC4</td>
</tr>
<tr><td>plaintext_encrypted</td>
<td>2097152</td>
<td>the handshake of this connection was obfuscated
with a diffie-hellman exchange</td>
</tr>
</tbody>
</table>
<a name="peer_source_flags"></a></div>
<div class="section" id="enum-peer-source-flags">
<h2>enum peer_source_flags</h2>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/peer_info.hpp">libtorrent/peer_info.hpp</a>&quot;</p>
<table border="1" class="docutils">
<colgroup>
<col width="18%" />
<col width="10%" />
<col width="72%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">name</th>
<th class="head">value</th>
<th class="head">description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>tracker</td>
<td>1</td>
<td>The peer was received from the tracker.</td>
</tr>
<tr><td>dht</td>
<td>2</td>
<td>The peer was received from the kademlia DHT.</td>
</tr>
<tr><td>pex</td>
<td>4</td>
<td>The peer was received from the peer exchange
extension.</td>
</tr>
<tr><td>lsd</td>
<td>8</td>
<td>The peer was received from the local service
discovery (The peer is on the local network).</td>
</tr>
<tr><td>resume_data</td>
<td>16</td>
<td>The peer was added from the fast resume data.</td>
</tr>
<tr><td>incoming</td>
<td>32</td>
<td>we received an incoming connection from this peer</td>
</tr>
</tbody>
</table>
<a name="bw_state"></a></div>
<div class="section" id="enum-bw-state">
<h2>enum bw_state</h2>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/peer_info.hpp">libtorrent/peer_info.hpp</a>&quot;</p>
<table border="1" class="docutils">
<colgroup>
<col width="16%" />
<col width="10%" />
<col width="74%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">name</th>
<th class="head">value</th>
<th class="head">description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>bw_idle</td>
<td>0</td>
<td>The peer is not waiting for any external events to
send or receive data.</td>
</tr>
<tr><td>bw_limit</td>
<td>1</td>
<td>The peer is waiting for the rate limiter.</td>
</tr>
<tr><td>bw_network</td>
<td>2</td>
<td>The peer has quota and is currently waiting for a
network read or write operation to complete. This is
the state all peers are in if there are no bandwidth
limits.</td>
</tr>
<tr><td>bw_disk</td>
<td>4</td>
<td>The peer is waiting for the disk I/O thread to catch
up writing buffers to disk before downloading more.</td>
</tr>
</tbody>
</table>
<a name="connection_type_t"></a></div>
<div class="section" id="enum-connection-type-t">
<h2>enum connection_type_t</h2>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/peer_info.hpp">libtorrent/peer_info.hpp</a>&quot;</p>
<table border="1" class="docutils">
<colgroup>
<col width="28%" />
<col width="9%" />
<col width="62%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">name</th>
<th class="head">value</th>
<th class="head">description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>standard_bittorrent</td>
<td>0</td>
<td>Regular bittorrent connection over TCP</td>
</tr>
<tr><td>web_seed</td>
<td>1</td>
<td>HTTP connection using the <a class="reference external" href="http://bittorrent.org/beps/bep_0019.html">BEP 19</a> protocol</td>
</tr>
<tr><td>http_seed</td>
<td>2</td>
<td>HTTP connection using the <a class="reference external" href="http://bittorrent.org/beps/bep_0017.html">BEP 17</a> protocol</td>
</tr>
</tbody>
</table>
<a name="flags"></a><dl class="docutils">
<dt>flags</dt>
<dd>tells you in which state the peer is in. It is set to
any combination of the <a class="reference external" href="reference-Core.html#peer_flags_t">peer_flags_t</a> enum.</dd>
</dl>
<a name="source"></a><dl class="docutils">
<dt>source</dt>
<dd>a combination of flags describing from which sources this peer
was received.</dd>
</dl>
<a name="read_state"></a>
<a name="write_state"></a><dl class="docutils">
<dt>read_state write_state</dt>
<dd>bitmasks indicating what state this peer is in with regards to sending
and receiving data. The states are declared in the <a class="reference external" href="reference-Core.html#bw_state">bw_state</a> enum.</dd>
</dl>
<a name="ip"></a><dl class="docutils">
<dt>ip</dt>
<dd>the IP-address to this peer. The type is an asio endpoint. For
more info, see the <a class="reference external" href="http://asio.sourceforge.net/asio-0.3.8/doc/asio/reference.html">asio</a> documentation.</dd>
</dl>
<a name="up_speed"></a>
<a name="down_speed"></a><dl class="docutils">
<dt>up_speed down_speed</dt>
<dd>the current upload and download speed we have to and from this peer
(including any protocol messages). updated about once per second</dd>
</dl>
<a name="payload_up_speed"></a>
<a name="payload_down_speed"></a><dl class="docutils">
<dt>payload_up_speed payload_down_speed</dt>
<dd>The transfer rates of payload data only updated about once per second</dd>
</dl>
<a name="total_download"></a>
<a name="total_upload"></a><dl class="docutils">
<dt>total_download total_upload</dt>
<dd>the total number of bytes downloaded from and uploaded to this peer.
These numbers do not include the protocol chatter, but only the
payload data.</dd>
</dl>
<a name="pid"></a><dl class="docutils">
<dt>pid</dt>
<dd>the peer's id as used in the bit torrent protocol. This id can be used
to extract 'fingerprints' from the peer. Sometimes it can tell you
which client the peer is using. See identify_client()_</dd>
</dl>
<a name="pieces"></a><dl class="docutils">
<dt>pieces</dt>
<dd>a <a class="reference external" href="reference-Utility.html#bitfield">bitfield</a>, with one bit per piece in the torrent.
Each bit tells you if the peer has that piece (if it's set to 1)
or if the peer miss that piece (set to 0).</dd>
</dl>
<a name="upload_limit"></a>
<a name="download_limit"></a><dl class="docutils">
<dt>upload_limit download_limit</dt>
<dd>the number of bytes per second we are allowed to send to or receive
from this peer. It may be -1 if there's no local limit on the peer.
The global limit and the torrent limit may also be enforced.</dd>
</dl>
<a name="last_request"></a>
<a name="last_active"></a><dl class="docutils">
<dt>last_request last_active</dt>
<dd>the time since we last sent a request
to this peer and since any transfer occurred with this peer</dd>
</dl>
<a name="download_queue_time"></a>
<a name="queue_bytes"></a><dl class="docutils">
<dt>download_queue_time queue_bytes</dt>
<dd>the time until all blocks in the request
queue will be d</dd>
</dl>
<a name="request_timeout"></a><dl class="docutils">
<dt>request_timeout</dt>
<dd>the number of seconds until the current front piece request will time
out. This timeout can be adjusted through
<tt class="docutils literal"><span class="pre">session_settings::request_timeout</span></tt>.
-1 means that there is not outstanding request.</dd>
</dl>
<a name="send_buffer_size"></a>
<a name="used_send_buffer"></a><dl class="docutils">
<dt>send_buffer_size used_send_buffer</dt>
<dd>the number of bytes allocated
and used for the peer's send buffer, respectively.</dd>
</dl>
<a name="receive_buffer_size"></a>
<a name="used_receive_buffer"></a><dl class="docutils">
<dt>receive_buffer_size used_receive_buffer</dt>
<dd>the number of bytes
allocated and used as receive buffer, respectively.</dd>
</dl>
<a name="num_hashfails"></a><dl class="docutils">
<dt>num_hashfails</dt>
<dd>the number of pieces this peer has participated in
sending us that turned out to fail the hash check.</dd>
</dl>
<a name="country[2]"></a><dl class="docutils">
<dt>country[2]</dt>
<dd>the two letter <a class="reference external" href="http://www.iso.org/iso/en/prods-services/iso3166ma/02iso-3166-code-lists/list-en1.html">ISO 3166 country code</a> for the country the peer is
connected from. If the country hasn't been resolved yet, both chars
are set to 0. If the resolution failed for some reason, the field is
set to &quot;--&quot;. If the resolution service returns an invalid country
code, it is set to &quot;!!&quot;. The <tt class="docutils literal">countries.nerd.dk</tt> service is used to
look up countries. This field will remain set to 0 unless the torrent
is set to resolve countries, see <a class="reference internal" href="#resolve-countries">resolve_countries()</a>.</dd>
</dl>
<a name="inet_as_name"></a><dl class="docutils">
<dt>inet_as_name</dt>
<dd>the name of the AS this peer is located in. This might be
an empty string if there is no name in the geo ip database.</dd>
</dl>
<a name="inet_as"></a><dl class="docutils">
<dt>inet_as</dt>
<dd>the AS number the peer is located in.</dd>
</dl>
<a name="load_balancing"></a><dl class="docutils">
<dt>load_balancing</dt>
<dd>a measurement of the balancing of free download (that we get) and free
upload that we give. Every peer gets a certain amount of free upload,
but this member says how much <em>extra</em> free upload this peer has got.
If it is a negative number it means that this was a peer from which we
have got this amount of free download.</dd>
</dl>
<a name="download_queue_length"></a><dl class="docutils">
<dt>download_queue_length</dt>
<dd>this is the number of requests
we have sent to this peer
that we haven't got a response
for yet</dd>
</dl>
<a name="timed_out_requests"></a><dl class="docutils">
<dt>timed_out_requests</dt>
<dd>the number of block requests that have
timed out, and are still in the download
queue</dd>
</dl>
<a name="busy_requests"></a><dl class="docutils">
<dt>busy_requests</dt>
<dd>the number of busy requests in the download
queue. A budy request is a request for a block
we've also requested from a different peer</dd>
</dl>
<a name="requests_in_buffer"></a><dl class="docutils">
<dt>requests_in_buffer</dt>
<dd>the number of requests messages that are currently in the
send buffer waiting to be sent.</dd>
</dl>
<a name="target_dl_queue_length"></a><dl class="docutils">
<dt>target_dl_queue_length</dt>
<dd>the number of requests that is
tried to be maintained (this is
typically a function of download speed)</dd>
</dl>
<a name="upload_queue_length"></a><dl class="docutils">
<dt>upload_queue_length</dt>
<dd>the number of piece-requests we have received from this peer
that we haven't answered with a piece yet.</dd>
</dl>
<a name="failcount"></a><dl class="docutils">
<dt>failcount</dt>
<dd>the number of times this peer has &quot;failed&quot;. i.e. failed to connect or
disconnected us. The failcount is decremented when we see this peer in
a tracker response or peer exchange message.</dd>
</dl>
<a name="downloading_piece_index"></a>
<a name="downloading_block_index"></a>
<a name="downloading_progress"></a>
<a name="downloading_total"></a><dl class="docutils">
<dt>downloading_piece_index downloading_block_index downloading_progress downloading_total</dt>
<dd>You can know which piece, and which part of that piece, that is
currently being downloaded from a specific peer by looking at these
four members. <tt class="docutils literal">downloading_piece_index</tt> is the index of the piece
that is currently being downloaded. This may be set to -1 if there's
currently no piece downloading from this peer. If it is &gt;= 0, the
other three members are valid. <tt class="docutils literal">downloading_block_index</tt> is the
index of the block (or sub-piece) that is being downloaded.
<tt class="docutils literal">downloading_progress</tt> is the number of bytes of this block we have
received from the peer, and <tt class="docutils literal">downloading_total</tt> is the total number
of bytes in this block.</dd>
</dl>
<a name="client"></a><dl class="docutils">
<dt>client</dt>
<dd>a string describing the software at the other end of the connection.
In some cases this information is not available, then it will contain
a string that may give away something about which software is running
in the other end. In the case of a web seed, the server type and
version will be a part of this string.</dd>
</dl>
<a name="connection_type"></a><dl class="docutils">
<dt>connection_type</dt>
<dd>the kind of connection this peer uses. See <a class="reference external" href="reference-Core.html#connection_type_t">connection_type_t</a>.</dd>
</dl>
<a name="remote_dl_rate"></a><dl class="docutils">
<dt>remote_dl_rate</dt>
<dd>an estimate of the rate this peer is downloading at, in
bytes per second.</dd>
</dl>
<a name="pending_disk_bytes"></a><dl class="docutils">
<dt>pending_disk_bytes</dt>
<dd>the number of bytes this peer has pending in the disk-io thread.
Downloaded and waiting to be written to disk. This is what is capped
by <tt class="docutils literal"><span class="pre">session_settings::max_queued_disk_bytes</span></tt>.</dd>
</dl>
<a name="send_quota"></a>
<a name="receive_quota"></a><dl class="docutils">
<dt>send_quota receive_quota</dt>
<dd>the number of bytes this peer has been assigned to be allowed to send
and receive until it has to request more quota from the bandwidth
manager.</dd>
</dl>
<a name="rtt"></a><dl class="docutils">
<dt>rtt</dt>
<dd>an estimated round trip time to this peer, in milliseconds. It is
estimated by timing the the tcp <tt class="docutils literal">connect()</tt>. It may be 0 for
incoming connections.</dd>
</dl>
<a name="num_pieces"></a><dl class="docutils">
<dt>num_pieces</dt>
<dd>the number of pieces this peer has.</dd>
</dl>
<a name="download_rate_peak"></a>
<a name="upload_rate_peak"></a><dl class="docutils">
<dt>download_rate_peak upload_rate_peak</dt>
<dd>the highest download and upload rates seen on this connection. They
are given in bytes per second. This number is reset to 0 on reconnect.</dd>
</dl>
<a name="progress_ppm"></a><dl class="docutils">
<dt>progress_ppm</dt>
<dd>indicates the download progress of the peer in the range [0, 1000000]
(parts per million).</dd>
</dl>
<a name="estimated_reciprocation_rate"></a><dl class="docutils">
<dt>estimated_reciprocation_rate</dt>
<dd>this is an estimation of the upload rate, to this peer, where it will
unchoke us. This is a coarse estimation based on the rate at which
we sent right before we were choked. This is primarily used for the
bittyrant choking algorithm.</dd>
</dl>
<a name="local_endpoint"></a><dl class="docutils">
<dt>local_endpoint</dt>
<dd>the IP and port pair the socket is bound to locally. i.e. the IP
address of the interface it's going out over. This may be useful for
multi-homed clients with multiple interfaces to the internet.</dd>
</dl>
<a name="peer_request"></a></div>
</div>
<div class="section" id="peer-request">
<h1>peer_request</h1>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/peer_request.hpp">libtorrent/peer_request.hpp</a>&quot;</p>
<p>represents a byte range within a piece. Internally this is
is used for incoming piece requests.</p>
<pre class="literal-block">
struct peer_request
{
bool <strong>operator==</strong> (peer_request const&amp; r) const;
int piece;
int start;
int length;
};
</pre>
<a name="operator==()"></a><div class="section" id="operator">
<h2>operator==()</h2>
<pre class="literal-block">
bool <strong>operator==</strong> (peer_request const&amp; r) const;
</pre>
<p>returns true if the right hand side <a class="reference external" href="reference-Core.html#peer_request">peer_request</a> refers to the same
range as this does.</p>
<a name="piece"></a><dl class="docutils">
<dt>piece</dt>
<dd>the index of the piece in which the range starts.</dd>
</dl>
<a name="start"></a><dl class="docutils">
<dt>start</dt>
<dd>the offset within that piece where the range starts.</dd>
</dl>
<a name="length"></a><dl class="docutils">
<dt>length</dt>
<dd>the size of the range, in bytes.</dd>
</dl>
<a name="block_info"></a></div>
</div>
<div class="section" id="block-info">
<h1>block_info</h1>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/torrent_handle.hpp">libtorrent/torrent_handle.hpp</a>&quot;</p>
<p>holds the state of a block in a piece. Who we requested
it from and how far along we are at downloading it.</p>
<pre class="literal-block">
struct block_info
{
void <strong>set_peer</strong> (<a class="reference external" href="tcp::endpoint">tcp::endpoint</a> const&amp; ep);
<a class="reference external" href="tcp::endpoint">tcp::endpoint</a> <strong>peer</strong> () const;
enum block_state_t
{
none,
requested,
writing,
finished,
};
unsigned bytes_progress:15;
unsigned block_size:15;
unsigned state:2;
unsigned num_peers:14;
};
</pre>
<a name="set_peer()"></a>
<a name="peer()"></a><div class="section" id="set-peer-peer">
<h2>set_peer() peer()</h2>
<pre class="literal-block">
void <strong>set_peer</strong> (<a class="reference external" href="tcp::endpoint">tcp::endpoint</a> const&amp; ep);
<a class="reference external" href="tcp::endpoint">tcp::endpoint</a> <strong>peer</strong> () const;
</pre>
<p>The peer is the ip address of the peer this block was downloaded from.</p>
<a name="block_state_t"></a></div>
<div class="section" id="enum-block-state-t">
<h2>enum block_state_t</h2>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/torrent_handle.hpp">libtorrent/torrent_handle.hpp</a>&quot;</p>
<table border="1" class="docutils">
<colgroup>
<col width="13%" />
<col width="8%" />
<col width="79%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">name</th>
<th class="head">value</th>
<th class="head">description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>none</td>
<td>0</td>
<td>This block has not been downloaded or requested form any peer.</td>
</tr>
<tr><td>requested</td>
<td>1</td>
<td>The block has been requested, but not completely downloaded yet.</td>
</tr>
<tr><td>writing</td>
<td>2</td>
<td>The block has been downloaded and is currently queued for being
written to disk.</td>
</tr>
<tr><td>finished</td>
<td>3</td>
<td>The block has been written to disk.</td>
</tr>
</tbody>
</table>
<a name="bytes_progress"></a><dl class="docutils">
<dt>bytes_progress</dt>
<dd>the number of bytes that have been received for this block</dd>
</dl>
<a name="block_size"></a><dl class="docutils">
<dt>block_size</dt>
<dd>the total number of bytes in this block.</dd>
</dl>
<a name="state"></a><dl class="docutils">
<dt>state</dt>
<dd>the state this block is in (see <a class="reference external" href="reference-Core.html#block_state_t">block_state_t</a>)</dd>
</dl>
<a name="num_peers"></a><dl class="docutils">
<dt>num_peers</dt>
<dd>the number of peers that is currently requesting this block. Typically
this is 0 or 1, but at the end of the torrent blocks may be requested
by more peers in parallel to speed things up.</dd>
</dl>
<a name="partial_piece_info"></a></div>
</div>
<div class="section" id="partial-piece-info">
<h1>partial_piece_info</h1>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/torrent_handle.hpp">libtorrent/torrent_handle.hpp</a>&quot;</p>
<p>This class holds information about pieces that have outstanding requests
or outstanding writes</p>
<pre class="literal-block">
struct partial_piece_info
{
enum state_t
{
none,
slow,
medium,
fast,
};
int piece_index;
int blocks_in_piece;
int finished;
int writing;
int requested;
block_info* blocks;
state_t piece_state;
};
</pre>
<a name="state_t"></a><div class="section" id="enum-state-t">
<h2>enum state_t</h2>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/torrent_handle.hpp">libtorrent/torrent_handle.hpp</a>&quot;</p>
<table border="1" class="docutils">
<colgroup>
<col width="29%" />
<col width="25%" />
<col width="46%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">name</th>
<th class="head">value</th>
<th class="head">description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>none</td>
<td>0</td>
<td>&nbsp;</td>
</tr>
<tr><td>slow</td>
<td>1</td>
<td>&nbsp;</td>
</tr>
<tr><td>medium</td>
<td>2</td>
<td>&nbsp;</td>
</tr>
<tr><td>fast</td>
<td>3</td>
<td>&nbsp;</td>
</tr>
</tbody>
</table>
<a name="piece_index"></a><dl class="docutils">
<dt>piece_index</dt>
<dd>the index of the piece in question. <tt class="docutils literal">blocks_in_piece</tt> is the number
of blocks in this particular piece. This number will be the same for
most pieces, but
the last piece may have fewer blocks than the standard pieces.</dd>
</dl>
<a name="blocks_in_piece"></a><dl class="docutils">
<dt>blocks_in_piece</dt>
<dd>the number of blocks in this piece</dd>
</dl>
<a name="finished"></a><dl class="docutils">
<dt>finished</dt>
<dd>the number of blocks that are in the finished state</dd>
</dl>
<a name="writing"></a><dl class="docutils">
<dt>writing</dt>
<dd>the number of blocks that are in the writing state</dd>
</dl>
<a name="requested"></a><dl class="docutils">
<dt>requested</dt>
<dd>the number of blocks that are in the requested state</dd>
</dl>
<a name="blocks"></a><dl class="docutils">
<dt>blocks</dt>
<dd><p class="first">this is an array of <tt class="docutils literal">blocks_in_piece</tt> number of
items. One for each block in the piece.</p>
<div class="warning last">
<p class="first admonition-title">Warning</p>
<p class="last">This is a pointer that points to an array
that's owned by the <a class="reference external" href="reference-Session.html#session">session</a> object. The next time
<a class="reference external" href="reference-Core.html#get_download_queue()">get_download_queue()</a> is called, it will be invalidated.</p>
</div>
</dd>
</dl>
<a name="piece_state"></a><dl class="docutils">
<dt>piece_state</dt>
<dd><p class="first">the download speed class this piece falls into.
this is used internally to cluster peers of the same
speed class together when requesting blocks.</p>
<p class="last">set to either <tt class="docutils literal">fast</tt>, <tt class="docutils literal">medium</tt>, <tt class="docutils literal">slow</tt> or <tt class="docutils literal">none</tt>. It tells
which download rate category the peers downloading this piece falls
into. <tt class="docutils literal">none</tt> means that no peer is currently downloading any part of
the piece. Peers prefer picking pieces from the same category as
themselves. The reason for this is to keep the number of partially
downloaded pieces down. Pieces set to <tt class="docutils literal">none</tt> can be converted into
any of <tt class="docutils literal">fast</tt>, <tt class="docutils literal">medium</tt> or <tt class="docutils literal">slow</tt> as soon as a peer want to
download from it.</p>
</dd>
</dl>
<a name="torrent_handle"></a></div>
</div>
<div class="section" id="torrent-handle">
<h1>torrent_handle</h1>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/torrent_handle.hpp">libtorrent/torrent_handle.hpp</a>&quot;</p>
<p>You will usually have to store your torrent handles somewhere, since it's
the object through which you retrieve information about the torrent and
aborts the torrent.</p>
<div class="warning">
<p class="first admonition-title">Warning</p>
<p class="last">Any member function that returns a value or fills in a value has to be
made synchronously. This means it has to wait for the main thread to
complete the query before it can return. This might potentially be
expensive if done from within a GUI thread that needs to stay
responsive. Try to avoid quering for information you don't need, and
try to do it in as few calls as possible. You can get most of the
interesting information about a torrent from the
torrent_handle::status() call.</p>
</div>
<p>The default constructor will initialize the handle to an invalid state.
Which means you cannot perform any operation on it, unless you first
assign it a valid handle. If you try to perform any operation on an
uninitialized handle, it will throw <tt class="docutils literal">invalid_handle</tt>.</p>
<div class="warning">
<p class="first admonition-title">Warning</p>
<p class="last">All operations on a torrent_handle may throw libtorrent_exception
exception, in case the handle is no longer refering to a torrent.
There is one exception is_valid() will never throw. Since the torrents
are processed by a background thread, there is no guarantee that a
handle will remain valid between two calls.</p>
</div>
<pre class="literal-block">
struct torrent_handle
{
<strong>torrent_handle</strong> ();
void <strong>add_piece</strong> (int piece, char const* data, int flags = 0) const;
void <strong>read_piece</strong> (int piece) const;
bool <strong>have_piece</strong> (int piece) const;
void <strong>get_peer_info</strong> (std::vector&lt;peer_info&gt;&amp; v) const;
torrent_status <strong>status</strong> (boost::uint32_t flags = 0xffffffff) const;
void <strong>get_download_queue</strong> (std::vector&lt;partial_piece_info&gt;&amp; queue) const;
void <strong>reset_piece_deadline</strong> (int index) const;
void <strong>set_piece_deadline</strong> (int index, int deadline, int flags = 0) const;
void <strong>set_priority</strong> (int prio) const;
void <strong>file_progress</strong> (std::vector&lt;size_type&gt;&amp; progress, int flags = 0) const;
void <strong>clear_error</strong> () const;
std::vector&lt;announce_entry&gt; <strong>trackers</strong> () const;
void <strong>replace_trackers</strong> (std::vector&lt;announce_entry&gt; const&amp;) const;
void <strong>add_tracker</strong> (announce_entry const&amp;) const;
void <strong>add_url_seed</strong> (std::string const&amp; url) const;
void <strong>remove_url_seed</strong> (std::string const&amp; url) const;
std::set&lt;std::string&gt; <strong>url_seeds</strong> () const;
void <strong>add_http_seed</strong> (std::string const&amp; url) const;
void <strong>remove_http_seed</strong> (std::string const&amp; url) const;
std::set&lt;std::string&gt; <strong>http_seeds</strong> () const;
void <strong>add_extension</strong> (
boost::function&lt;boost::shared_ptr&lt;torrent_plugin&gt;(torrent*, void*)&gt; const&amp; ext
, void* userdata = 0);
bool <strong>set_metadata</strong> (char const* metadata, int size) const;
bool <strong>is_valid</strong> () const;
void <strong>pause</strong> (int flags = 0) const;
void <strong>resume</strong> () const;
void <strong>set_upload_mode</strong> (bool b) const;
void <strong>set_share_mode</strong> (bool b) const;
void <strong>flush_cache</strong> () const;
void <strong>apply_ip_filter</strong> (bool b) const;
void <strong>force_recheck</strong> () const;
void <strong>save_resume_data</strong> (int flags = 0) const;
bool <strong>need_save_resume_data</strong> () const;
void <strong>auto_managed</strong> (bool m) const;
void <strong>queue_position_down</strong> () const;
void <strong>queue_position_top</strong> () const;
int <strong>queue_position</strong> () const;
void <strong>queue_position_bottom</strong> () const;
void <strong>queue_position_up</strong> () const;
void <strong>resolve_countries</strong> (bool r);
bool <strong>resolve_countries</strong> () const;
void <strong>set_ssl_certificate</strong> (std::string const&amp; certificate
, std::string const&amp; private_key
, std::string const&amp; dh_params
, std::string const&amp; passphrase = &quot;&quot;);
storage_interface* <strong>get_storage_impl</strong> () const;
boost::intrusive_ptr&lt;torrent_info const&gt; <strong>torrent_file</strong> () const;
void <strong>use_interface</strong> (const char* net_interface) const;
void <strong>piece_availability</strong> (std::vector&lt;int&gt;&amp; avail) const;
int <strong>piece_priority</strong> (int index) const;
void <strong>piece_priority</strong> (int index, int priority) const;
void <strong>prioritize_pieces</strong> (std::vector&lt;int&gt; const&amp; pieces) const;
std::vector&lt;int&gt; <strong>piece_priorities</strong> () const;
int <strong>file_priority</strong> (int index) const;
void <strong>prioritize_files</strong> (std::vector&lt;int&gt; const&amp; files) const;
void <strong>file_priority</strong> (int index, int priority) const;
std::vector&lt;int&gt; <strong>file_priorities</strong> () const;
void <strong>force_reannounce</strong> (int seconds = 0, int tracker_index = -1) const;
void <strong>force_dht_announce</strong> () const;
void <strong>scrape_tracker</strong> () const;
int <strong>upload_limit</strong> () const;
int <strong>download_limit</strong> () const;
void <strong>set_upload_limit</strong> (int limit) const;
void <strong>set_download_limit</strong> (int limit) const;
void <strong>set_sequential_download</strong> (bool sd) const;
void <strong>connect_peer</strong> (<a class="reference external" href="tcp::endpoint">tcp::endpoint</a> const&amp; adr, int source = 0) const;
int <strong>max_uploads</strong> () const;
void <strong>set_max_uploads</strong> (int max_uploads) const;
int <strong>max_connections</strong> () const;
void <strong>set_max_connections</strong> (int max_connections) const;
void <strong>set_tracker_login</strong> (std::string const&amp; name
, std::string const&amp; password) const;
void <strong>move_storage</strong> (std::string const&amp; save_path, int flags = 0) const;
void <strong>rename_file</strong> (int index, std::string const&amp; new_name) const;
void <strong>super_seeding</strong> (bool on) const;
sha1_hash <strong>info_hash</strong> () const;
bool <strong>operator!=</strong> (const torrent_handle&amp; h) const;
bool <strong>operator&lt;</strong> (const torrent_handle&amp; h) const;
bool <strong>operator==</strong> (const torrent_handle&amp; h) const;
boost::shared_ptr&lt;torrent&gt; <strong>native_handle</strong> () const;
enum flags_t
{
overwrite_existing,
};
enum status_flags_t
{
query_distributed_copies,
query_accurate_download_counters,
query_last_seen_complete,
query_pieces,
query_verified_pieces,
query_torrent_file,
query_name,
query_save_path,
};
enum deadline_flags
{
alert_when_available,
};
enum file_progress_flags_t
{
piece_granularity,
};
enum pause_flags_t
{
graceful_pause,
};
enum save_resume_flags_t
{
flush_disk_cache,
save_info_dict,
};
};
</pre>
<a name="torrent_handle()"></a><div class="section" id="id26">
<h2>torrent_handle()</h2>
<pre class="literal-block">
<strong>torrent_handle</strong> ();
</pre>
<p>constructs a torrent handle that does not refer to a torrent.
i.e. <a class="reference external" href="reference-Core.html#is_valid()">is_valid()</a> will return false.</p>
<a name="add_piece()"></a></div>
<div class="section" id="add-piece">
<h2>add_piece()</h2>
<pre class="literal-block">
void <strong>add_piece</strong> (int piece, char const* data, int flags = 0) const;
</pre>
<p>This function will write <tt class="docutils literal">data</tt> to the storage as piece <tt class="docutils literal">piece</tt>,
as if it had been downloaded from a peer. <tt class="docutils literal">data</tt> is expected to
point to a buffer of as many bytes as the size of the specified piece.
The data in the buffer is copied and passed on to the disk IO thread
to be written at a later point.</p>
<p>By default, data that's already been downloaded is not overwritten by
this buffer. If you trust this data to be correct (and pass the piece
hash check) you may pass the overwrite_existing flag. This will
instruct libtorrent to overwrite any data that may already have been
downloaded with this data.</p>
<p>Since the data is written asynchronously, you may know that is passed
or failed the hash check by waiting for <a class="reference external" href="reference-Alerts.html#piece_finished_alert">piece_finished_alert</a> or
hash_failed_alert.</p>
<a name="read_piece()"></a></div>
<div class="section" id="read-piece">
<h2>read_piece()</h2>
<pre class="literal-block">
void <strong>read_piece</strong> (int piece) const;
</pre>
<p>This function starts an asynchronous read operation of the specified
piece from this torrent. You must have completed the download of the
specified piece before calling this function.</p>
<p>When the read operation is completed, it is passed back through an
<a class="reference external" href="reference-Alerts.html#alert">alert</a>, <a class="reference external" href="reference-Alerts.html#read_piece_alert">read_piece_alert</a>. Since this <a class="reference external" href="reference-Alerts.html#alert">alert</a> is a reponse to an explicit
call, it will always be posted, regardless of the <a class="reference external" href="reference-Alerts.html#alert">alert</a> mask.</p>
<p>Note that if you read multiple pieces, the read operations are not
guaranteed to finish in the same order as you initiated them.</p>
<a name="have_piece()"></a></div>
<div class="section" id="have-piece">
<h2>have_piece()</h2>
<pre class="literal-block">
bool <strong>have_piece</strong> (int piece) const;
</pre>
<p>Returns true if this piece has been completely downloaded, and false
otherwise.</p>
<a name="get_peer_info()"></a></div>
<div class="section" id="get-peer-info">
<h2>get_peer_info()</h2>
<pre class="literal-block">
void <strong>get_peer_info</strong> (std::vector&lt;peer_info&gt;&amp; v) const;
</pre>
<p>takes a reference to a vector that will be cleared and filled with one
<a class="reference external" href="reference-Bencoding.html#entry">entry</a> for each peer connected to this torrent, given the handle is
valid. If the <a class="reference external" href="reference-Core.html#torrent_handle">torrent_handle</a> is invalid, it will throw
<a class="reference external" href="reference-Error_Codes.html#libtorrent_exception">libtorrent_exception</a> exception. Each <a class="reference external" href="reference-Bencoding.html#entry">entry</a> in the vector contains
information about that particular peer. See <a class="reference external" href="reference-Core.html#peer_info">peer_info</a>.</p>
<a name="status()"></a></div>
<div class="section" id="status">
<h2>status()</h2>
<pre class="literal-block">
torrent_status <strong>status</strong> (boost::uint32_t flags = 0xffffffff) const;
</pre>
<p><tt class="docutils literal">status()</tt> will return a structure with information about the status
of this torrent. If the <a class="reference external" href="reference-Core.html#torrent_handle">torrent_handle</a> is invalid, it will throw
<a class="reference external" href="reference-Error_Codes.html#libtorrent_exception">libtorrent_exception</a> exception. See <a class="reference external" href="reference-Core.html#torrent_status">torrent_status</a>. The <tt class="docutils literal">flags</tt>
argument filters what information is returned in the <a class="reference external" href="reference-Core.html#torrent_status">torrent_status</a>.
Some information in there is relatively expensive to calculate, and if
you're not interested in it (and see performance issues), you can
filter them out.</p>
<p>By default everything is included. The flags you can use to decide
what to <em>include</em> are defined in the <a class="reference external" href="reference-Core.html#status_flags_t">status_flags_t</a> enum.</p>
<a name="get_download_queue()"></a></div>
<div class="section" id="get-download-queue">
<h2>get_download_queue()</h2>
<pre class="literal-block">
void <strong>get_download_queue</strong> (std::vector&lt;partial_piece_info&gt;&amp; queue) const;
</pre>
<p><tt class="docutils literal">get_download_queue()</tt> takes a non-const reference to a vector which
it will fill with information about pieces that are partially
downloaded or not downloaded at all but partially requested. See
<a class="reference external" href="reference-Core.html#partial_piece_info">partial_piece_info</a> for the fields in the returned vector.</p>
<a name="reset_piece_deadline()"></a>
<a name="set_piece_deadline()"></a></div>
<div class="section" id="reset-piece-deadline-set-piece-deadline">
<h2>reset_piece_deadline() set_piece_deadline()</h2>
<pre class="literal-block">
void <strong>reset_piece_deadline</strong> (int index) const;
void <strong>set_piece_deadline</strong> (int index, int deadline, int flags = 0) const;
</pre>
<p>This function sets or resets the deadline associated with a specific
piece index (<tt class="docutils literal">index</tt>). libtorrent will attempt to download this
entire piece before the deadline expires. This is not necessarily
possible, but pieces with a more recent deadline will always be
prioritized over pieces with a deadline further ahead in time. The
deadline (and flags) of a piece can be changed by calling this
function again.</p>
<p>The <tt class="docutils literal">flags</tt> parameter can be used to ask libtorrent to send an <a class="reference external" href="reference-Alerts.html#alert">alert</a>
once the piece has been downloaded, by passing alert_when_available.
When set, the <a class="reference external" href="reference-Alerts.html#read_piece_alert">read_piece_alert</a> <a class="reference external" href="reference-Alerts.html#alert">alert</a> will be delivered, with the piece
data, when it's downloaded.</p>
<p>If the piece is already downloaded when this call is made, nothing
happens, unless the alert_when_available flag is set, in which case it
will do the same thing as calling <a class="reference external" href="reference-Core.html#read_piece()">read_piece()</a> for <tt class="docutils literal">index</tt>.</p>
<p><tt class="docutils literal">deadline</tt> is the number of milliseconds until this piece should be
completed.</p>
<p><tt class="docutils literal">reset_piece_deadline</tt> removes the deadline from the piece. If it
hasn't already been downloaded, it will no longer be considered a
priority.</p>
<a name="set_priority()"></a></div>
<div class="section" id="set-priority">
<h2>set_priority()</h2>
<pre class="literal-block">
void <strong>set_priority</strong> (int prio) const;
</pre>
<p>This sets the bandwidth priority of this torrent. The priority of a
torrent determines how much bandwidth its peers are assigned when
distributing upload and download rate quotas. A high number gives more
bandwidth. The priority must be within the range [0, 255].</p>
<p>The default priority is 0, which is the lowest priority.</p>
<p>To query the priority of a torrent, use the
<tt class="docutils literal"><span class="pre">torrent_handle::status()</span></tt> call.</p>
<p>Torrents with higher priority will not nececcarily get as much
bandwidth as they can consume, even if there's is more quota. Other
peers will still be weighed in when bandwidth is being distributed.
With other words, bandwidth is not distributed strictly in order of
priority, but the priority is used as a weight.</p>
<p>Peers whose Torrent has a higher priority will take precedence when
distributing unchoke slots. This is a strict prioritization where
every interested peer on a high priority torrent will be unchoked
before any other, lower priority, torrents have any peers unchoked.</p>
<a name="file_progress()"></a></div>
<div class="section" id="file-progress">
<h2>file_progress()</h2>
<pre class="literal-block">
void <strong>file_progress</strong> (std::vector&lt;size_type&gt;&amp; progress, int flags = 0) const;
</pre>
<p>This function fills in the supplied vector with the the number of
bytes downloaded of each file in this torrent. The progress values are
ordered the same as the files in the <a class="reference external" href="reference-Core.html#torrent_info">torrent_info</a>. This operation is
not very cheap. Its complexity is <em>O(n + mj)</em>. Where <em>n</em> is the number
of files, <em>m</em> is the number of downloading pieces and <em>j</em> is the
number of blocks in a piece.</p>
<p>The <tt class="docutils literal">flags</tt> parameter can be used to specify the granularity of the
file progress. If left at the default value of 0, the progress will be
as accurate as possible, but also more expensive to calculate. If
<tt class="docutils literal"><span class="pre">torrent_handle::piece_granularity</span></tt> is specified, the progress will
be specified in piece granularity. i.e. only pieces that have been
fully downloaded and passed the hash check count. When specifying
piece granularity, the operation is a lot cheaper, since libtorrent
already keeps track of this internally and no calculation is required.</p>
<a name="clear_error()"></a></div>
<div class="section" id="clear-error">
<h2>clear_error()</h2>
<pre class="literal-block">
void <strong>clear_error</strong> () const;
</pre>
<p>If the torrent is in an error state (i.e. <tt class="docutils literal"><span class="pre">torrent_status::error</span></tt> is
non-empty), this will clear the error and start the torrent again.</p>
<a name="add_tracker()"></a>
<a name="replace_trackers()"></a>
<a name="trackers()"></a></div>
<div class="section" id="add-tracker-replace-trackers-trackers">
<h2>add_tracker() replace_trackers() trackers()</h2>
<pre class="literal-block">
std::vector&lt;announce_entry&gt; <strong>trackers</strong> () const;
void <strong>replace_trackers</strong> (std::vector&lt;announce_entry&gt; const&amp;) const;
void <strong>add_tracker</strong> (announce_entry const&amp;) const;
</pre>
<p><tt class="docutils literal">trackers()</tt> will return the list of trackers for this torrent. The
announce <a class="reference external" href="reference-Bencoding.html#entry">entry</a> contains both a string <tt class="docutils literal">url</tt> which specify the
announce url for the tracker as well as an int <tt class="docutils literal">tier</tt>, which is
specifies the order in which this tracker is tried. If you want
libtorrent to use another list of trackers for this torrent, you can
use <tt class="docutils literal">replace_trackers()</tt> which takes a list of the same form as the
one returned from <tt class="docutils literal">trackers()</tt> and will replace it. If you want an
immediate effect, you have to call <a class="reference external" href="reference-Core.html#force_reannounce()">force_reannounce()</a>. See
announce_entry.</p>
<p><tt class="docutils literal">add_tracker()</tt> will look if the specified tracker is already in the
set. If it is, it doesn't do anything. If it's not in the current set
of trackers, it will insert it in the tier specified in the
announce_entry.</p>
<p>The updated set of trackers will be saved in the resume data, and when
a torrent is started with resume data, the trackers from the resume
data will replace the original ones.</p>
<a name="url_seeds()"></a>
<a name="add_url_seed()"></a>
<a name="remove_url_seed()"></a></div>
<div class="section" id="url-seeds-add-url-seed-remove-url-seed">
<h2>url_seeds() add_url_seed() remove_url_seed()</h2>
<pre class="literal-block">
void <strong>add_url_seed</strong> (std::string const&amp; url) const;
void <strong>remove_url_seed</strong> (std::string const&amp; url) const;
std::set&lt;std::string&gt; <strong>url_seeds</strong> () const;
</pre>
<p><tt class="docutils literal">add_url_seed()</tt> adds another url to the torrent's list of url
seeds. If the given url already exists in that list, the call has no
effect. The torrent will connect to the server and try to download
pieces from it, unless it's paused, queued, checking or seeding.
<tt class="docutils literal">remove_url_seed()</tt> removes the given url if it exists already.
<tt class="docutils literal">url_seeds()</tt> return a set of the url seeds currently in this
torrent. Note that urls that fails may be removed automatically from
the list.</p>
<p>See <a class="reference external" href="manual-ref.html#http-seeding">http seeding</a> for more information.</p>
<a name="http_seeds()"></a>
<a name="remove_http_seed()"></a>
<a name="add_http_seed()"></a></div>
<div class="section" id="http-seeds-remove-http-seed-add-http-seed">
<h2>http_seeds() remove_http_seed() add_http_seed()</h2>
<pre class="literal-block">
void <strong>add_http_seed</strong> (std::string const&amp; url) const;
void <strong>remove_http_seed</strong> (std::string const&amp; url) const;
std::set&lt;std::string&gt; <strong>http_seeds</strong> () const;
</pre>
<p>These functions are identical as the <tt class="docutils literal">*_url_seed()</tt> variants, but
they operate on <a class="reference external" href="http://bittorrent.org/beps/bep_0017.html">BEP 17</a> web seeds instead of <a class="reference external" href="http://bittorrent.org/beps/bep_0019.html">BEP 19</a>.</p>
<p>See <a class="reference external" href="manual-ref.html#http-seeding">http seeding</a> for more information.</p>
<a name="add_extension()"></a></div>
<div class="section" id="add-extension">
<h2>add_extension()</h2>
<pre class="literal-block">
void <strong>add_extension</strong> (
boost::function&lt;boost::shared_ptr&lt;torrent_plugin&gt;(torrent*, void*)&gt; const&amp; ext
, void* userdata = 0);
</pre>
<p>add the specified extension to this torrent. The <tt class="docutils literal">ext</tt> argument is
a function that will be called from within libtorrent's context
passing in the internal torrent object and the specified userdata
pointer. The function is expected to return a shared pointer to
a <a class="reference external" href="reference-Plugins.html#torrent_plugin">torrent_plugin</a> instance.</p>
<a name="set_metadata()"></a></div>
<div class="section" id="set-metadata">
<h2>set_metadata()</h2>
<pre class="literal-block">
bool <strong>set_metadata</strong> (char const* metadata, int size) const;
</pre>
<p><tt class="docutils literal">set_metadata</tt> expects the <em>info</em> section of metadata. i.e. The
buffer passed in will be hashed and verified against the info-hash. If
it fails, a <tt class="docutils literal">metadata_failed_alert</tt> will be generated. If it passes,
a <tt class="docutils literal">metadata_received_alert</tt> is generated. The function returns true
if the metadata is successfully set on the torrent, and false
otherwise. If the torrent already has metadata, this function will not
affect the torrent, and false will be returned.</p>
<a name="is_valid()"></a></div>
<div class="section" id="is-valid">
<h2>is_valid()</h2>
<pre class="literal-block">
bool <strong>is_valid</strong> () const;
</pre>
<p>Returns true if this handle refers to a valid torrent and false if it
hasn't been initialized or if the torrent it refers to has been
aborted. Note that a handle may become invalid after it has been added
to the <a class="reference external" href="reference-Session.html#session">session</a>. Usually this is because the storage for the torrent is
somehow invalid or if the filenames are not allowed (and hence cannot
be opened/created) on your filesystem. If such an error occurs, a
<a class="reference external" href="reference-Alerts.html#file_error_alert">file_error_alert</a> is generated and all handles that refers to that
torrent will become invalid.</p>
<a name="pause()"></a>
<a name="resume()"></a></div>
<div class="section" id="pause-resume">
<h2>pause() resume()</h2>
<pre class="literal-block">
void <strong>pause</strong> (int flags = 0) const;
void <strong>resume</strong> () const;
</pre>
<p><tt class="docutils literal">pause()</tt>, and <tt class="docutils literal">resume()</tt> will disconnect all peers and reconnect
all peers respectively. When a torrent is paused, it will however
remember all share ratios to all peers and remember all potential (not
connected) peers. Torrents may be paused automatically if there is a
file error (e.g. disk full) or something similar. See
file_error_alert.</p>
<p>To know if a torrent is paused or not, call
<tt class="docutils literal"><span class="pre">torrent_handle::status()</span></tt> and inspect <tt class="docutils literal"><span class="pre">torrent_status::paused</span></tt>.</p>
<p>The <tt class="docutils literal">flags</tt> argument to pause can be set to
<tt class="docutils literal"><span class="pre">torrent_handle::graceful_pause</span></tt> which will delay the disconnect of
peers that we're still downloading outstanding requests from. The
torrent will not accept any more requests and will disconnect all idle
peers. As soon as a peer is done transferring the blocks that were
requested from it, it is disconnected. This is a graceful shut down of
the torrent in the sense that no downloaded bytes are wasted.</p>
<p>torrents that are auto-managed may be automatically resumed again. It
does not make sense to pause an auto-managed torrent without making it
not automanaged first. Torrents are auto-managed by default when added
to the <a class="reference external" href="reference-Session.html#session">session</a>. For more information, see <a class="reference external" href="manual-ref.html#queuing">queuing</a>.</p>
<a name="set_upload_mode()"></a></div>
<div class="section" id="set-upload-mode">
<h2>set_upload_mode()</h2>
<pre class="literal-block">
void <strong>set_upload_mode</strong> (bool b) const;
</pre>
<p>Explicitly sets the upload mode of the torrent. In upload mode, the
torrent will not request any pieces. If the torrent is auto managed,
it will automatically be taken out of upload mode periodically (see
<tt class="docutils literal"><span class="pre">session_settings::optimistic_disk_retry</span></tt>). Torrents are
automatically put in upload mode whenever they encounter a disk write
error.</p>
<p><tt class="docutils literal">m</tt> should be true to enter upload mode, and false to leave it.</p>
<p>To test if a torrent is in upload mode, call
<tt class="docutils literal"><span class="pre">torrent_handle::status()</span></tt> and inspect
<tt class="docutils literal"><span class="pre">torrent_status::upload_mode</span></tt>.</p>
<a name="set_share_mode()"></a></div>
<div class="section" id="set-share-mode">
<h2>set_share_mode()</h2>
<pre class="literal-block">
void <strong>set_share_mode</strong> (bool b) const;
</pre>
<p>Enable or disable share mode for this torrent. When in share mode, the
torrent will not necessarily be downloaded, especially not the whole
of it. Only parts that are likely to be distributed to more than 2
other peers are downloaded, and only if the previous prediction was
correct.</p>
<a name="flush_cache()"></a></div>
<div class="section" id="flush-cache">
<h2>flush_cache()</h2>
<pre class="literal-block">
void <strong>flush_cache</strong> () const;
</pre>
<p>Instructs libtorrent to flush all the disk caches for this torrent and
close all file handles. This is done asynchronously and you will be
notified that it's complete through <a class="reference external" href="reference-Alerts.html#cache_flushed_alert">cache_flushed_alert</a>.</p>
<p>Note that by the time you get the <a class="reference external" href="reference-Alerts.html#alert">alert</a>, libtorrent may have cached
more data for the torrent, but you are guaranteed that whatever cached
data libtorrent had by the time you called
<tt class="docutils literal"><span class="pre">torrent_handle::flush_cache()</span></tt> has been written to disk.</p>
<a name="apply_ip_filter()"></a></div>
<div class="section" id="apply-ip-filter">
<h2>apply_ip_filter()</h2>
<pre class="literal-block">
void <strong>apply_ip_filter</strong> (bool b) const;
</pre>
<p>Set to true to apply the <a class="reference external" href="reference-Session.html#session">session</a> global IP filter to this torrent
(which is the default). Set to false to make this torrent ignore the
IP filter.</p>
<a name="force_recheck()"></a></div>
<div class="section" id="force-recheck">
<h2>force_recheck()</h2>
<pre class="literal-block">
void <strong>force_recheck</strong> () const;
</pre>
<p><tt class="docutils literal">force_recheck</tt> puts the torrent back in a state where it assumes to
have no resume data. All peers will be disconnected and the torrent
will stop announcing to the tracker. The torrent will be added to the
checking queue, and will be checked (all the files will be read and
compared to the piece hashes). Once the check is complete, the torrent
will start connecting to peers again, as normal.</p>
<a name="save_resume_data()"></a></div>
<div class="section" id="save-resume-data">
<h2>save_resume_data()</h2>
<pre class="literal-block">
void <strong>save_resume_data</strong> (int flags = 0) const;
</pre>
<p><tt class="docutils literal">save_resume_data()</tt> generates fast-resume data and returns it as an
<a class="reference external" href="reference-Bencoding.html#entry">entry</a>. This <a class="reference external" href="reference-Bencoding.html#entry">entry</a> is suitable for being bencoded. For more information
about how fast-resume works, see <a class="reference external" href="manual-ref.html#fast-resume">fast resume</a>.</p>
<p>The <tt class="docutils literal">flags</tt> argument is a bitmask of flags ORed together. see
save_resume_flags_t</p>
<p>This operation is asynchronous, <tt class="docutils literal">save_resume_data</tt> will return
immediately. The resume data is delivered when it's done through an
save_resume_data_alert.</p>
<p>The fast resume data will be empty in the following cases:</p>
<blockquote>
<ol class="arabic simple">
<li>The torrent handle is invalid.</li>
<li>The torrent is checking (or is queued for checking) its storage, it
will obviously not be ready to write resume data.</li>
<li>The torrent hasn't received valid metadata and was started without
metadata (see libtorrent's <a class="reference external" href="manual-ref.html#metadata-from-peers">metadata from peers</a> extension)</li>
</ol>
</blockquote>
<p>Note that by the time you receive the fast resume data, it may already
be invalid if the torrent is still downloading! The recommended
practice is to first pause the <a class="reference external" href="reference-Session.html#session">session</a>, then generate the fast resume
data, and then close it down. Make sure to not <a class="reference external" href="reference-Session.html#remove_torrent()">remove_torrent()</a> before
you receive the <a class="reference external" href="reference-Alerts.html#save_resume_data_alert">save_resume_data_alert</a> though. There's no need to
pause when saving intermittent resume data.</p>
<div class="warning">
<p class="first admonition-title">Warning</p>
<p class="last">If you pause every torrent individually instead of pausing the
<a class="reference external" href="reference-Session.html#session">session</a>, every torrent will have its paused state saved in the
resume data!</p>
</div>
<div class="warning">
<p class="first admonition-title">Warning</p>
<p class="last">The resume data contains the modification timestamps for all files.
If one file has been modified when the torrent is added again, the
will be rechecked. When shutting down, make sure to flush the disk
cache before saving the resume data. This will make sure that the
file timestamps are up to date and won't be modified after saving
the resume data. The recommended way to do this is to pause the
torrent, which will flush the cache and disconnect all peers.</p>
</div>
<div class="note">
<p class="first admonition-title">Note</p>
<p>It is typically a good idea to save resume data whenever a torrent
is completed or paused. In those cases you don't need to pause the
torrent or the <a class="reference external" href="reference-Session.html#session">session</a>, since the torrent will do no more writing to
its files. If you save resume data for torrents when they are
paused, you can accelerate the shutdown process by not saving resume
data again for paused torrents. Completed torrents should have their
resume data saved when they complete and on exit, since their
statistics might be updated.</p>
<blockquote class="last">
In full allocation mode the reume data is never invalidated by
subsequent writes to the files, since pieces won't move around. This
means that you don't need to pause before writing resume data in full
or sparse mode. If you don't, however, any data written to disk after
you saved resume data and before the <a class="reference external" href="reference-Session.html#session">session</a> closed is lost.</blockquote>
</div>
<p>It also means that if the resume data is out dated, libtorrent will
not re-check the files, but assume that it is fairly recent. The
assumption is that it's better to loose a little bit than to re-check
the entire file.</p>
<p>It is still a good idea to save resume data periodically during
download as well as when closing down.</p>
<p>Example code to pause and save resume data for all torrents and wait
for the alerts:</p>
<pre class="literal-block">
extern int outstanding_resume_data; // global counter of outstanding resume data
std::vector&lt;torrent_handle&gt; handles = ses.get_torrents();
ses.pause();
for (std::vector&lt;torrent_handle&gt;::iterator i = handles.begin();
i != handles.end(); ++i)
{
torrent_handle&amp; h = *i;
if (!h.is_valid()) continue;
torrent_status s = h.status();
if (!s.has_metadata) continue;
if (!s.need_save_resume_data()) continue;
h.save_resume_data();
++outstanding_resume_data;
}
while (outstanding_resume_data &gt; 0)
{
alert const* a = ses.wait_for_alert(seconds(10));
// if we don't get an alert within 10 seconds, abort
if (a == 0) break;
std::auto_ptr&lt;alert&gt; holder = ses.pop_alert();
if (alert_cast&lt;save_resume_data_failed_alert&gt;(a))
{
process_alert(a);
--outstanding_resume_data;
continue;
}
save_resume_data_alert const* rd = alert_cast&lt;save_resume_data_alert&gt;(a);
if (rd == 0)
{
process_alert(a);
continue;
}
torrent_handle h = rd-&gt;handle;
torrent_status st = h.status(torrent_handle::query_save_path | torrent_handle::query_name);
std::ofstream out((st.save_path
+ &quot;/&quot; + st.name + &quot;.fastresume&quot;).c_str()
, std::ios_base::binary);
out.unsetf(std::ios_base::skipws);
bencode(std::ostream_iterator&lt;char&gt;(out), *rd-&gt;resume_data);
--outstanding_resume_data;
}
</pre>
<div class="note">
<p class="first admonition-title">Note</p>
<p class="last">Note how <tt class="docutils literal">outstanding_resume_data</tt> is a global counter in this
example. This is deliberate, otherwise there is a race condition for
torrents that was just asked to save their resume data, they posted
the alert, but it has not been received yet. Those torrents would
report that they don't need to save resume data again, and skipped by
the initial loop, and thwart the counter otherwise.</p>
</div>
<a name="need_save_resume_data()"></a></div>
<div class="section" id="need-save-resume-data">
<h2>need_save_resume_data()</h2>
<pre class="literal-block">
bool <strong>need_save_resume_data</strong> () const;
</pre>
<p>This function returns true if any whole chunk has been downloaded
since the torrent was first loaded or since the last time the resume
data was saved. When saving resume data periodically, it makes sense
to skip any torrent which hasn't downloaded anything since the last
time.</p>
<div class="note">
<p class="first admonition-title">Note</p>
<p class="last">A torrent's resume data is considered saved as soon as the alert is
posted. It is important to make sure this alert is received and
handled in order for this function to be meaningful.</p>
</div>
<a name="auto_managed()"></a></div>
<div class="section" id="auto-managed">
<h2>auto_managed()</h2>
<pre class="literal-block">
void <strong>auto_managed</strong> (bool m) const;
</pre>
<p>changes whether the torrent is auto managed or not. For more info,
see <a class="reference external" href="manual-ref.html#queuing">queuing</a>.</p>
<a name="queue_position()"></a>
<a name="queue_position_up()"></a>
<a name="queue_position_bottom()"></a>
<a name="queue_position_down()"></a>
<a name="queue_position_top()"></a></div>
<div class="section" id="queue-position-queue-position-up-queue-position-bottom-queue-position-down-queue-position-top">
<h2>queue_position() queue_position_up() queue_position_bottom() queue_position_down() queue_position_top()</h2>
<pre class="literal-block">
void <strong>queue_position_down</strong> () const;
void <strong>queue_position_top</strong> () const;
int <strong>queue_position</strong> () const;
void <strong>queue_position_bottom</strong> () const;
void <strong>queue_position_up</strong> () const;
</pre>
<p>Every torrent that is added is assigned a queue position exactly one
greater than the greatest queue position of all existing torrents.
Torrents that are being seeded have -1 as their queue position, since
they're no longer in line to be downloaded.</p>
<p>When a torrent is removed or turns into a seed, all torrents with
greater queue positions have their positions decreased to fill in the
space in the sequence.</p>
<p><tt class="docutils literal">queue_position()</tt> returns the torrent's position in the download
queue. The torrents with the smallest numbers are the ones that are
being downloaded. The smaller number, the closer the torrent is to the
front of the line to be started.</p>
<p>The queue position is also available in the <a class="reference external" href="reference-Core.html#torrent_status">torrent_status</a>.</p>
<p>The <tt class="docutils literal"><span class="pre">queue_position_*()</span></tt> functions adjust the torrents position in
the queue. Up means closer to the front and down means closer to the
back of the queue. Top and bottom refers to the front and the back of
the queue respectively.</p>
<a name="resolve_countries()"></a></div>
<div class="section" id="resolve-countries">
<h2>resolve_countries()</h2>
<pre class="literal-block">
void <strong>resolve_countries</strong> (bool r);
bool <strong>resolve_countries</strong> () const;
</pre>
<p>Sets or gets the flag that derermines if countries should be resolved
for the peers of this torrent. It defaults to false. If it is set to
true, the <a class="reference external" href="reference-Core.html#peer_info">peer_info</a> structure for the peers in this torrent will have
their <tt class="docutils literal">country</tt> member set. See <a class="reference external" href="reference-Core.html#peer_info">peer_info</a> for more information on
how to interpret this field.</p>
<a name="set_ssl_certificate()"></a></div>
<div class="section" id="set-ssl-certificate">
<h2>set_ssl_certificate()</h2>
<pre class="literal-block">
void <strong>set_ssl_certificate</strong> (std::string const&amp; certificate
, std::string const&amp; private_key
, std::string const&amp; dh_params
, std::string const&amp; passphrase = &quot;&quot;);
</pre>
<p>For SSL torrents, use this to specify a path to a .pem file to use as
this client's certificate. The certificate must be signed by the
certificate in the .torrent file to be valid.</p>
<p><tt class="docutils literal">cert</tt> is a path to the (signed) certificate in .pem format
corresponding to this torrent.</p>
<p><tt class="docutils literal">private_key</tt> is a path to the private key for the specified
certificate. This must be in .pem format.</p>
<p><tt class="docutils literal">dh_params</tt> is a path to the Diffie-Hellman parameter file, which
needs to be in .pem format. You can generate this file using the
openssl command like this: <tt class="docutils literal">openssl dhparam <span class="pre">-outform</span> PEM <span class="pre">-out</span>
dhparams.pem 512</tt>.</p>
<p><tt class="docutils literal">passphrase</tt> may be specified if the private key is encrypted and
requires a passphrase to be decrypted.</p>
<p>Note that when a torrent first starts up, and it needs a certificate,
it will suspend connecting to any peers until it has one. It's
typically desirable to resume the torrent after setting the ssl
certificate.</p>
<p>If you receive a <a class="reference external" href="reference-Alerts.html#torrent_need_cert_alert">torrent_need_cert_alert</a>, you need to call this to
provide a valid cert. If you don't have a cert you won't be allowed to
connect to any peers.</p>
<a name="get_storage_impl()"></a></div>
<div class="section" id="get-storage-impl">
<h2>get_storage_impl()</h2>
<pre class="literal-block">
storage_interface* <strong>get_storage_impl</strong> () const;
</pre>
<p>Returns the storage implementation for this torrent. This depends on the
storage contructor function that was passed to add_torrent.</p>
<a name="torrent_file()"></a></div>
<div class="section" id="torrent-file">
<h2>torrent_file()</h2>
<pre class="literal-block">
boost::intrusive_ptr&lt;torrent_info const&gt; <strong>torrent_file</strong> () const;
</pre>
<p>Returns a pointer to the <a class="reference external" href="reference-Core.html#torrent_info">torrent_info</a> object associated with this
torrent. The <a class="reference external" href="reference-Core.html#torrent_info">torrent_info</a> object may be a copy of the internal object.
If the torrent doesn't have metadata, the pointer will not be
initialized (i.e. a NULL pointer). The torrent may be in a state
without metadata only if it was started without a .torrent file, e.g.
by using the libtorrent extension of just supplying a tracker and
info-hash.</p>
<a name="use_interface()"></a></div>
<div class="section" id="use-interface">
<h2>use_interface()</h2>
<pre class="literal-block">
void <strong>use_interface</strong> (const char* net_interface) const;
</pre>
<p><tt class="docutils literal">use_interface()</tt> sets the network interface this torrent will use
when it opens outgoing connections. By default, it uses the same
interface as the <a class="reference external" href="reference-Session.html#session">session</a> uses to listen on. The parameter must be a
string containing one or more, comma separated, ip-address (either an
IPv4 or IPv6 address). When specifying multiple interfaces, the
torrent will round-robin which interface to use for each outgoing
conneciton. This is useful for clients that are multi-homed.</p>
<a name="piece_availability()"></a></div>
<div class="section" id="piece-availability">
<h2>piece_availability()</h2>
<pre class="literal-block">
void <strong>piece_availability</strong> (std::vector&lt;int&gt;&amp; avail) const;
</pre>
<p>Fills the specified <tt class="docutils literal"><span class="pre">std::vector&lt;int&gt;</span></tt> with the availability for
each piece in this torrent. libtorrent does not keep track of
availability for seeds, so if the torrent is seeding the availability
for all pieces is reported as 0.</p>
<p>The piece availability is the number of peers that we are connected
that has advertized having a particular piece. This is the information
that libtorrent uses in order to prefer picking rare pieces.</p>
<a name="piece_priority()"></a>
<a name="prioritize_pieces()"></a>
<a name="piece_priorities()"></a></div>
<div class="section" id="piece-priority-prioritize-pieces-piece-priorities">
<h2>piece_priority() prioritize_pieces() piece_priorities()</h2>
<pre class="literal-block">
int <strong>piece_priority</strong> (int index) const;
void <strong>piece_priority</strong> (int index, int priority) const;
void <strong>prioritize_pieces</strong> (std::vector&lt;int&gt; const&amp; pieces) const;
std::vector&lt;int&gt; <strong>piece_priorities</strong> () const;
</pre>
<p>These functions are used to set and get the prioritiy of individual
pieces. By default all pieces have priority 1. That means that the
random rarest first algorithm is effectively active for all pieces.
You may however change the priority of individual pieces. There are 8
different priority levels:</p>
<blockquote>
<ol class="arabic simple" start="0">
<li>piece is not downloaded at all</li>
<li>normal priority. Download order is dependent on availability</li>
<li>higher than normal priority. Pieces are preferred over pieces with
the same availability, but not over pieces with lower availability</li>
<li>pieces are as likely to be picked as partial pieces.</li>
<li>pieces are preferred over partial pieces, but not over pieces with
lower availability</li>
<li><em>currently the same as 4</em></li>
<li>piece is as likely to be picked as any piece with availability 1</li>
<li>maximum priority, availability is disregarded, the piece is
preferred over any other piece with lower priority</li>
</ol>
</blockquote>
<p>The exact definitions of these priorities are implementation details,
and subject to change. The interface guarantees that higher number
means higher priority, and that 0 means do not download.</p>
<p><tt class="docutils literal">piece_priority</tt> sets or gets the priority for an individual piece,
specified by <tt class="docutils literal">index</tt>.</p>
<p><tt class="docutils literal">prioritize_pieces</tt> takes a vector of integers, one integer per
piece in the torrent. All the piece priorities will be updated with
the priorities in the vector.</p>
<p><tt class="docutils literal">piece_priorities</tt> returns a vector with one element for each piece
in the torrent. Each element is the current priority of that piece.</p>
<a name="file_priorities()"></a>
<a name="prioritize_files()"></a>
<a name="file_priority()"></a></div>
<div class="section" id="file-priorities-prioritize-files-file-priority">
<h2>file_priorities() prioritize_files() file_priority()</h2>
<pre class="literal-block">
int <strong>file_priority</strong> (int index) const;
void <strong>prioritize_files</strong> (std::vector&lt;int&gt; const&amp; files) const;
void <strong>file_priority</strong> (int index, int priority) const;
std::vector&lt;int&gt; <strong>file_priorities</strong> () const;
</pre>
<p><tt class="docutils literal">index</tt> must be in the range [0, number_of_files).</p>
<p><tt class="docutils literal">file_priority()</tt> queries or sets the priority of file <tt class="docutils literal">index</tt>.</p>
<p><tt class="docutils literal">prioritize_files()</tt> takes a vector that has at as many elements as
there are files in the torrent. Each <a class="reference external" href="reference-Bencoding.html#entry">entry</a> is the priority of that
file. The function sets the priorities of all the pieces in the
torrent based on the vector.</p>
<p><tt class="docutils literal">file_priorities()</tt> returns a vector with the priorities of all
files.</p>
<p>The priority values are the same as for <a class="reference external" href="reference-Core.html#piece_priority()">piece_priority()</a>.</p>
<p>Whenever a file priority is changed, all other piece priorities are
reset to match the file priorities. In order to maintain sepcial
priorities for particular pieces, <a class="reference external" href="reference-Core.html#piece_priority()">piece_priority()</a> has to be called
again for those pieces.</p>
<p>You cannot set the file priorities on a torrent that does not yet have
metadata or a torrent that is a seed. <tt class="docutils literal">file_priority(int, int)</tt> and
<a class="reference external" href="reference-Core.html#prioritize_files()">prioritize_files()</a> are both no-ops for such torrents.</p>
<a name="force_reannounce()"></a>
<a name="force_dht_announce()"></a></div>
<div class="section" id="force-reannounce-force-dht-announce">
<h2>force_reannounce() force_dht_announce()</h2>
<pre class="literal-block">
void <strong>force_reannounce</strong> (int seconds = 0, int tracker_index = -1) const;
void <strong>force_dht_announce</strong> () const;
</pre>
<p><tt class="docutils literal">force_reannounce()</tt> will force this torrent to do another tracker
request, to receive new peers. The <tt class="docutils literal">seconds</tt> argument specifies how
many seconds from now to issue the tracker announces.</p>
<p>If the tracker's <tt class="docutils literal">min_interval</tt> has not passed since the last
announce, the forced announce will be scheduled to happen immediately
as the <tt class="docutils literal">min_interval</tt> expires. This is to honor trackers minimum
re-announce interval settings.</p>
<p>The <tt class="docutils literal">tracker_index</tt> argument specifies which tracker to re-announce.
If set to -1 (which is the default), all trackers are re-announce.</p>
<p><tt class="docutils literal">force_dht_announce</tt> will announce the torrent to the DHT
immediately.</p>
<a name="scrape_tracker()"></a></div>
<div class="section" id="scrape-tracker">
<h2>scrape_tracker()</h2>
<pre class="literal-block">
void <strong>scrape_tracker</strong> () const;
</pre>
<p><tt class="docutils literal">scrape_tracker()</tt> will send a scrape request to the tracker. A
scrape request queries the tracker for statistics such as total number
of incomplete peers, complete peers, number of downloads etc.</p>
<p>This request will specifically update the <tt class="docutils literal">num_complete</tt> and
<tt class="docutils literal">num_incomplete</tt> fields in the <a class="reference external" href="reference-Core.html#torrent_status">torrent_status</a> struct once it
completes. When it completes, it will generate a <a class="reference external" href="reference-Alerts.html#scrape_reply_alert">scrape_reply_alert</a>.
If it fails, it will generate a <a class="reference external" href="reference-Alerts.html#scrape_failed_alert">scrape_failed_alert</a>.</p>
<a name="set_upload_limit()"></a>
<a name="upload_limit()"></a>
<a name="download_limit()"></a>
<a name="set_download_limit()"></a></div>
<div class="section" id="set-upload-limit-upload-limit-download-limit-set-download-limit">
<h2>set_upload_limit() upload_limit() download_limit() set_download_limit()</h2>
<pre class="literal-block">
int <strong>upload_limit</strong> () const;
int <strong>download_limit</strong> () const;
void <strong>set_upload_limit</strong> (int limit) const;
void <strong>set_download_limit</strong> (int limit) const;
</pre>
<p><tt class="docutils literal">set_upload_limit</tt> will limit the upload bandwidth used by this
particular torrent to the limit you set. It is given as the number of
bytes per second the torrent is allowed to upload.
<tt class="docutils literal">set_download_limit</tt> works the same way but for download bandwidth
instead of upload bandwidth. Note that setting a higher limit on a
torrent then the global limit
(<tt class="docutils literal"><span class="pre">session_settings::upload_rate_limit</span></tt>) will not override the global
rate limit. The torrent can never upload more than the global rate
limit.</p>
<p><tt class="docutils literal">upload_limit</tt> and <tt class="docutils literal">download_limit</tt> will return the current limit
setting, for upload and download, respectively.</p>
<a name="set_sequential_download()"></a></div>
<div class="section" id="set-sequential-download">
<h2>set_sequential_download()</h2>
<pre class="literal-block">
void <strong>set_sequential_download</strong> (bool sd) const;
</pre>
<p><tt class="docutils literal">set_sequential_download()</tt> enables or disables <em>sequential
download</em>. When enabled, the piece picker will pick pieces in sequence
instead of rarest first.</p>
<p>Enabling sequential download will affect the piece distribution
negatively in the swarm. It should be used sparingly.</p>
<a name="connect_peer()"></a></div>
<div class="section" id="connect-peer">
<h2>connect_peer()</h2>
<pre class="literal-block">
void <strong>connect_peer</strong> (<a class="reference external" href="tcp::endpoint">tcp::endpoint</a> const&amp; adr, int source = 0) const;
</pre>
<p><tt class="docutils literal">connect_peer()</tt> is a way to manually connect to peers that one
believe is a part of the torrent. If the peer does not respond, or is
not a member of this torrent, it will simply be disconnected. No harm
can be done by using this other than an unnecessary connection attempt
is made. If the torrent is uninitialized or in queued or checking
mode, this will throw <a class="reference external" href="reference-Error_Codes.html#libtorrent_exception">libtorrent_exception</a>. The second (optional)
argument will be bitwised ORed into the source mask of this peer.
Typically this is one of the source flags in <a class="reference external" href="reference-Core.html#peer_info">peer_info</a>. i.e.
<tt class="docutils literal">tracker</tt>, <tt class="docutils literal">pex</tt>, <tt class="docutils literal">dht</tt> etc.</p>
<a name="max_uploads()"></a>
<a name="set_max_uploads()"></a></div>
<div class="section" id="max-uploads-set-max-uploads">
<h2>max_uploads() set_max_uploads()</h2>
<pre class="literal-block">
int <strong>max_uploads</strong> () const;
void <strong>set_max_uploads</strong> (int max_uploads) const;
</pre>
<p><tt class="docutils literal">set_max_uploads()</tt> sets the maximum number of peers that's unchoked
at the same time on this torrent. If you set this to -1, there will be
no limit. This defaults to infinite. The primary setting controlling
this is the global unchoke slots limit, set by unchoke_slots_limit in
session_settings.</p>
<p><tt class="docutils literal">max_uploads()</tt> returns the current settings.</p>
<a name="max_connections()"></a>
<a name="set_max_connections()"></a></div>
<div class="section" id="max-connections-set-max-connections">
<h2>max_connections() set_max_connections()</h2>
<pre class="literal-block">
int <strong>max_connections</strong> () const;
void <strong>set_max_connections</strong> (int max_connections) const;
</pre>
<p><tt class="docutils literal">set_max_connections()</tt> sets the maximum number of connection this
torrent will open. If all connections are used up, incoming
connections may be refused or poor connections may be closed. This
must be at least 2. The default is unlimited number of connections. If
-1 is given to the function, it means unlimited. There is also a
global limit of the number of connections, set by
<tt class="docutils literal">connections_limit</tt> in <a class="reference external" href="reference-Settings.html#session_settings">session_settings</a>.</p>
<p><tt class="docutils literal">max_connections()</tt> returns the current settings.</p>
<a name="set_tracker_login()"></a></div>
<div class="section" id="set-tracker-login">
<h2>set_tracker_login()</h2>
<pre class="literal-block">
void <strong>set_tracker_login</strong> (std::string const&amp; name
, std::string const&amp; password) const;
</pre>
<p>sets a username and password that will be sent along in the HTTP-request
of the tracker announce. Set this if the tracker requires authorization.</p>
<a name="move_storage()"></a></div>
<div class="section" id="move-storage">
<h2>move_storage()</h2>
<pre class="literal-block">
void <strong>move_storage</strong> (std::string const&amp; save_path, int flags = 0) const;
</pre>
<p>Moves the file(s) that this torrent are currently seeding from or
downloading to. If the given <tt class="docutils literal">save_path</tt> is not located on the same
drive as the original save path, the files will be copied to the new
drive and removed from their original location. This will block all
other disk IO, and other torrents download and upload rates may drop
while copying the file.</p>
<p>Since disk IO is performed in a separate thread, this operation is
also asynchronous. Once the operation completes, the
<tt class="docutils literal">storage_moved_alert</tt> is generated, with the new path as the
message. If the move fails for some reason,
<tt class="docutils literal">storage_moved_failed_alert</tt> is generated instead, containing the
error message.</p>
<p>The <tt class="docutils literal">flags</tt> argument determines the behavior of the copying/moving
of the files in the torrent. see <a class="reference external" href="reference-Custom_Storage.html#move_flags_t">move_flags_t</a>.</p>
<blockquote>
<ul class="simple">
<li>always_replace_files = 0</li>
<li>fail_if_exist = 1</li>
<li>dont_replace = 2</li>
</ul>
</blockquote>
<p><tt class="docutils literal">always_replace_files</tt> is the default and replaces any file that
exist in both the source directory and the target directory.</p>
<p><tt class="docutils literal">fail_if_exist</tt> first check to see that none of the copy operations
would cause an overwrite. If it would, it will fail. Otherwise it will
proceed as if it was in <tt class="docutils literal">always_replace_files</tt> mode. Note that there
is an inherent race condition here. If the files in the target
directory appear after the check but before the copy or move
completes, they will be overwritten. When failing because of files
already existing in the target path, the <tt class="docutils literal">error</tt> of
<tt class="docutils literal">move_storage_failed_alert</tt> is set to
<tt class="docutils literal"><span class="pre">boost::system::errc::file_exists</span></tt>.</p>
<p>The intention is that a client may use this as a probe, and if it
fails, ask the user which mode to use. The client may then re-issue
the <tt class="docutils literal">move_storage</tt> call with one of the other modes.</p>
<p><tt class="docutils literal">dont_replace</tt> always takes the existing file in the target
directory, if there is one. The source files will still be removed in
that case.</p>
<p>Files that have been renamed to have absolute pahts are not moved by
this function. Keep in mind that files that don't belong to the
torrent but are stored in the torrent's directory may be moved as
well. This goes for files that have been renamed to absolute paths
that still end up inside the save path.</p>
<a name="rename_file()"></a></div>
<div class="section" id="rename-file">
<h2>rename_file()</h2>
<pre class="literal-block">
void <strong>rename_file</strong> (int index, std::string const&amp; new_name) const;
</pre>
<p>Renames the file with the given index asynchronously. The rename
operation is complete when either a <a class="reference external" href="reference-Alerts.html#file_renamed_alert">file_renamed_alert</a> or
<a class="reference external" href="reference-Alerts.html#file_rename_failed_alert">file_rename_failed_alert</a> is posted.</p>
<a name="super_seeding()"></a></div>
<div class="section" id="super-seeding">
<h2>super_seeding()</h2>
<pre class="literal-block">
void <strong>super_seeding</strong> (bool on) const;
</pre>
<p>Enables or disabled super seeding/initial seeding for this torrent. The torrent
needs to be a seed for this to take effect.</p>
<a name="info_hash()"></a></div>
<div class="section" id="info-hash">
<h2>info_hash()</h2>
<pre class="literal-block">
sha1_hash <strong>info_hash</strong> () const;
</pre>
<p><tt class="docutils literal">info_hash()</tt> returns the info-hash for the torrent.</p>
<a name="operator!=()"></a>
<a name="operator<()"></a>
<a name="operator==()"></a></div>
<div class="section" id="operator-operator-operator">
<h2>operator!=() operator&lt;() operator==()</h2>
<pre class="literal-block">
bool <strong>operator!=</strong> (const torrent_handle&amp; h) const;
bool <strong>operator&lt;</strong> (const torrent_handle&amp; h) const;
bool <strong>operator==</strong> (const torrent_handle&amp; h) const;
</pre>
<p>comparison operators. The order of the torrents is unspecified
but stable.</p>
<a name="native_handle()"></a></div>
<div class="section" id="native-handle">
<h2>native_handle()</h2>
<pre class="literal-block">
boost::shared_ptr&lt;torrent&gt; <strong>native_handle</strong> () const;
</pre>
<p>This function is intended only for use by plugins and the <a class="reference external" href="reference-Alerts.html#alert">alert</a>
dispatch function. Any code that runs in libtorrent's network thread
may not use the public API of <a class="reference external" href="reference-Core.html#torrent_handle">torrent_handle</a>. Doing so results in a
dead-lock. For such routines, the <tt class="docutils literal">native_handle</tt> gives access to
the underlying type representing the torrent. This type does not have
a stable API and should be relied on as little as possible.</p>
<a name="flags_t"></a></div>
<div class="section" id="enum-flags-t">
<h2>enum flags_t</h2>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/torrent_handle.hpp">libtorrent/torrent_handle.hpp</a>&quot;</p>
<table border="1" class="docutils">
<colgroup>
<col width="50%" />
<col width="18%" />
<col width="33%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">name</th>
<th class="head">value</th>
<th class="head">description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>overwrite_existing</td>
<td>1</td>
<td>&nbsp;</td>
</tr>
</tbody>
</table>
<a name="status_flags_t"></a></div>
<div class="section" id="enum-status-flags-t">
<h2>enum status_flags_t</h2>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/torrent_handle.hpp">libtorrent/torrent_handle.hpp</a>&quot;</p>
<table border="1" class="docutils">
<colgroup>
<col width="31%" />
<col width="6%" />
<col width="63%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">name</th>
<th class="head">value</th>
<th class="head">description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>query_distributed_copies</td>
<td>1</td>
<td>calculates <tt class="docutils literal">distributed_copies</tt>, <tt class="docutils literal">distributed_full_copies</tt> and
<tt class="docutils literal">distributed_fraction</tt>.</td>
</tr>
<tr><td>query_accurate_download_counters</td>
<td>2</td>
<td>includes partial downloaded blocks in <tt class="docutils literal">total_done</tt> and
<tt class="docutils literal">total_wanted_done</tt>.</td>
</tr>
<tr><td>query_last_seen_complete</td>
<td>4</td>
<td>includes <tt class="docutils literal">last_seen_complete</tt>.</td>
</tr>
<tr><td>query_pieces</td>
<td>8</td>
<td>includes <tt class="docutils literal">pieces</tt>.</td>
</tr>
<tr><td>query_verified_pieces</td>
<td>16</td>
<td>includes <tt class="docutils literal">verified_pieces</tt> (only applies to torrents in <em>seed
mode</em>).</td>
</tr>
<tr><td>query_torrent_file</td>
<td>32</td>
<td>includes <tt class="docutils literal">torrent_file</tt>, which is all the static information from
the .torrent file.</td>
</tr>
<tr><td>query_name</td>
<td>64</td>
<td>includes <tt class="docutils literal">name</tt>, the name of the torrent. This is either derived
from the .torrent file, or from the <tt class="docutils literal">&amp;dn=</tt> magnet link argument
or possibly some other source. If the name of the torrent is not
known, this is an empty string.</td>
</tr>
<tr><td>query_save_path</td>
<td>128</td>
<td>includes <tt class="docutils literal">save_path</tt>, the path to the directory the files of the
torrent are saved to.</td>
</tr>
</tbody>
</table>
<a name="deadline_flags"></a></div>
<div class="section" id="enum-deadline-flags">
<h2>enum deadline_flags</h2>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/torrent_handle.hpp">libtorrent/torrent_handle.hpp</a>&quot;</p>
<table border="1" class="docutils">
<colgroup>
<col width="52%" />
<col width="17%" />
<col width="31%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">name</th>
<th class="head">value</th>
<th class="head">description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>alert_when_available</td>
<td>1</td>
<td>&nbsp;</td>
</tr>
</tbody>
</table>
<a name="file_progress_flags_t"></a></div>
<div class="section" id="enum-file-progress-flags-t">
<h2>enum file_progress_flags_t</h2>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/torrent_handle.hpp">libtorrent/torrent_handle.hpp</a>&quot;</p>
<table border="1" class="docutils">
<colgroup>
<col width="20%" />
<col width="7%" />
<col width="73%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">name</th>
<th class="head">value</th>
<th class="head">description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>piece_granularity</td>
<td>1</td>
<td>only calculate file progress at piece granularity. This makes
the <a class="reference external" href="reference-Core.html#file_progress()">file_progress()</a> call cheaper and also only takes bytes that
have passed the hash check into account, so progress cannot
regress in this mode.</td>
</tr>
</tbody>
</table>
<a name="pause_flags_t"></a></div>
<div class="section" id="enum-pause-flags-t">
<h2>enum pause_flags_t</h2>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/torrent_handle.hpp">libtorrent/torrent_handle.hpp</a>&quot;</p>
<table border="1" class="docutils">
<colgroup>
<col width="44%" />
<col width="19%" />
<col width="36%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">name</th>
<th class="head">value</th>
<th class="head">description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>graceful_pause</td>
<td>1</td>
<td>&nbsp;</td>
</tr>
</tbody>
</table>
<a name="save_resume_flags_t"></a></div>
<div class="section" id="enum-save-resume-flags-t">
<h2>enum save_resume_flags_t</h2>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/torrent_handle.hpp">libtorrent/torrent_handle.hpp</a>&quot;</p>
<table border="1" class="docutils">
<colgroup>
<col width="19%" />
<col width="8%" />
<col width="73%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">name</th>
<th class="head">value</th>
<th class="head">description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>flush_disk_cache</td>
<td>1</td>
<td>the disk cache will be flushed before creating the resume data.
This avoids a problem with file timestamps in the resume data in
case the cache hasn't been flushed yet.</td>
</tr>
<tr><td>save_info_dict</td>
<td>2</td>
<td>the resume data will contain the metadata from the torrent file as
well. This is default for any torrent that's added without a
torrent file (such as a magnet link or a URL).</td>
</tr>
</tbody>
</table>
<a name="torrent_status"></a></div>
</div>
<div class="section" id="torrent-status">
<h1>torrent_status</h1>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/torrent_handle.hpp">libtorrent/torrent_handle.hpp</a>&quot;</p>
<p>holds a snapshot of the status of a torrent, as queried by
torrent_handle::status().</p>
<pre class="literal-block">
struct torrent_status
{
bool <strong>operator==</strong> (torrent_status const&amp; st) const;
enum state_t
{
queued_for_checking,
checking_files,
downloading_metadata,
downloading,
finished,
seeding,
allocating,
checking_resume_data,
};
torrent_handle handle;
std::string error;
std::string save_path;
std::string name;
boost::intrusive_ptr&lt;const torrent_info&gt; torrent_file;
boost::posix_time::time_duration next_announce;
boost::posix_time::time_duration announce_interval;
std::string current_tracker;
size_type total_download;
size_type total_upload;
size_type total_payload_download;
size_type total_payload_upload;
size_type total_failed_bytes;
size_type total_redundant_bytes;
bitfield pieces;
bitfield verified_pieces;
size_type total_done;
size_type total_wanted_done;
size_type total_wanted;
size_type all_time_upload;
size_type all_time_download;
time_t added_time;
time_t completed_time;
time_t last_seen_complete;
storage_mode_t storage_mode;
float progress;
int progress_ppm;
int queue_position;
int download_rate;
int upload_rate;
int download_payload_rate;
int upload_payload_rate;
int num_seeds;
int num_peers;
int num_complete;
int num_incomplete;
int list_seeds;
int list_peers;
int connect_candidates;
int num_pieces;
int distributed_full_copies;
int distributed_fraction;
float distributed_copies;
int block_size;
int num_uploads;
int num_connections;
int uploads_limit;
int connections_limit;
int up_bandwidth_queue;
int down_bandwidth_queue;
int time_since_upload;
int time_since_download;
int active_time;
int finished_time;
int seeding_time;
int seed_rank;
int last_scrape;
int sparse_regions;
int priority;
state_t state;
bool need_save_resume;
bool ip_filter_applies;
bool upload_mode;
bool share_mode;
bool super_seeding;
bool paused;
bool auto_managed;
bool sequential_download;
bool is_seeding;
bool is_finished;
bool has_metadata;
bool has_incoming;
bool seed_mode;
bool moving_storage;
sha1_hash info_hash;
};
</pre>
<a name="operator==()"></a><div class="section" id="id102">
<h2>operator==()</h2>
<pre class="literal-block">
bool <strong>operator==</strong> (torrent_status const&amp; st) const;
</pre>
<p>compres if the torrent status objects come from the same torrent. i.e.
only the <a class="reference external" href="reference-Core.html#torrent_handle">torrent_handle</a> field is compared.</p>
<a name="state_t"></a></div>
<div class="section" id="id104">
<h2>enum state_t</h2>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/torrent_handle.hpp">libtorrent/torrent_handle.hpp</a>&quot;</p>
<table border="1" class="docutils">
<colgroup>
<col width="25%" />
<col width="8%" />
<col width="67%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">name</th>
<th class="head">value</th>
<th class="head">description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>queued_for_checking</td>
<td>0</td>
<td>The torrent is in the queue for being checked. But there
currently is another torrent that are being checked.
This torrent will wait for its turn.</td>
</tr>
<tr><td>checking_files</td>
<td>1</td>
<td>The torrent has not started its download yet, and is
currently checking existing files.</td>
</tr>
<tr><td>downloading_metadata</td>
<td>2</td>
<td>The torrent is trying to download metadata from peers.
This assumes the metadata_transfer extension is in use.</td>
</tr>
<tr><td>downloading</td>
<td>3</td>
<td>The torrent is being downloaded. This is the state
most torrents will be in most of the time. The progress
meter will tell how much of the files that has been
downloaded.</td>
</tr>
<tr><td>finished</td>
<td>4</td>
<td>In this state the torrent has finished downloading but
still doesn't have the entire torrent. i.e. some pieces
are filtered and won't get downloaded.</td>
</tr>
<tr><td>seeding</td>
<td>5</td>
<td>In this state the torrent has finished downloading and
is a pure seeder.</td>
</tr>
<tr><td>allocating</td>
<td>6</td>
<td>If the torrent was started in full allocation mode, this
indicates that the (disk) storage for the torrent is
allocated.</td>
</tr>
<tr><td>checking_resume_data</td>
<td>7</td>
<td>The torrent is currently checking the fastresume data and
comparing it to the files on disk. This is typically
completed in a fraction of a second, but if you add a
large number of torrents at once, they will queue up.</td>
</tr>
</tbody>
</table>
<a name="handle"></a><dl class="docutils">
<dt>handle</dt>
<dd>a handle to the torrent whose status the object represents.</dd>
</dl>
<a name="error"></a><dl class="docutils">
<dt>error</dt>
<dd>may be set to an error message describing why the torrent
was paused, in case it was paused by an error. If the torrent
is not paused or if it's paused but not because of an error,
this string is empty.</dd>
</dl>
<a name="save_path"></a><dl class="docutils">
<dt>save_path</dt>
<dd>the path to the directory where this torrent's files are stored.
It's typically the path as was given to <a class="reference external" href="reference-Session.html#async_add_torrent()">async_add_torrent()</a> or
<a class="reference external" href="reference-Session.html#add_torrent()">add_torrent()</a> when this torrent was started. This field is only
included if the torrent status is queried with
<tt class="docutils literal"><span class="pre">torrent_handle::query_save_path</span></tt>.</dd>
</dl>
<a name="name"></a><dl class="docutils">
<dt>name</dt>
<dd>the name of the torrent. Typically this is derived from the
.torrent file. In case the torrent was started without metadata,
and hasn't completely received it yet, it returns the name given
to it when added to the <a class="reference external" href="reference-Session.html#session">session</a>. See <tt class="docutils literal"><span class="pre">session::add_torrent</span></tt>.
This field is only included if the torrent status is queried
with <tt class="docutils literal"><span class="pre">torrent_handle::query_name</span></tt>.</dd>
</dl>
<a name="torrent_file"></a><dl class="docutils">
<dt>torrent_file</dt>
<dd>set to point to the <tt class="docutils literal">torrent_info</tt> object for this torrent. It's
only included if the torrent status is queried with
<tt class="docutils literal"><span class="pre">torrent_handle::query_torrent_file</span></tt>.</dd>
</dl>
<a name="next_announce"></a><dl class="docutils">
<dt>next_announce</dt>
<dd>the time until the torrent will announce itself to the tracker.</dd>
</dl>
<a name="announce_interval"></a><dl class="docutils">
<dt>announce_interval</dt>
<dd>the time the tracker want us to wait until we announce ourself
again the next time.</dd>
</dl>
<a name="current_tracker"></a><dl class="docutils">
<dt>current_tracker</dt>
<dd>the URL of the last working tracker. If no tracker request has
been successful yet, it's set to an empty string.</dd>
</dl>
<a name="total_download"></a>
<a name="total_upload"></a><dl class="docutils">
<dt>total_download total_upload</dt>
<dd>the number of bytes downloaded and uploaded to all peers, accumulated,
<em>this session</em> only. The <a class="reference external" href="reference-Session.html#session">session</a> is considered to restart when a
torrent is paused and restarted again. When a torrent is paused, these
counters are reset to 0. If you want complete, persistent, stats, see
<tt class="docutils literal">all_time_upload</tt> and <tt class="docutils literal">all_time_download</tt>.</dd>
</dl>
<a name="total_payload_download"></a>
<a name="total_payload_upload"></a><dl class="docutils">
<dt>total_payload_download total_payload_upload</dt>
<dd>counts the amount of bytes send and received this <a class="reference external" href="reference-Session.html#session">session</a>, but only
the actual payload data (i.e the interesting data), these counters
ignore any protocol overhead.</dd>
</dl>
<a name="total_failed_bytes"></a><dl class="docutils">
<dt>total_failed_bytes</dt>
<dd>the number of bytes that has been downloaded and that has failed the
piece hash test. In other words, this is just how much crap that has
been downloaded.</dd>
</dl>
<a name="total_redundant_bytes"></a><dl class="docutils">
<dt>total_redundant_bytes</dt>
<dd>the number of bytes that has been downloaded even though that data
already was downloaded. The reason for this is that in some situations
the same data can be downloaded by mistake. When libtorrent sends
requests to a peer, and the peer doesn't send a response within a
certain timeout, libtorrent will re-request that block. Another
situation when libtorrent may re-request blocks is when the requests
it sends out are not replied in FIFO-order (it will re-request blocks
that are skipped by an out of order block). This is supposed to be as
low as possible.</dd>
</dl>
<a name="pieces"></a><dl class="docutils">
<dt>pieces</dt>
<dd>a bitmask that represents which pieces we have (set to true) and the
pieces we don't have. It's a pointer and may be set to 0 if the
torrent isn't downloading or seeding.</dd>
</dl>
<a name="verified_pieces"></a><dl class="docutils">
<dt>verified_pieces</dt>
<dd>a bitmask representing which pieces has had their hash checked. This
only applies to torrents in <em>seed mode</em>. If the torrent is not in seed
mode, this bitmask may be empty.</dd>
</dl>
<a name="total_done"></a><dl class="docutils">
<dt>total_done</dt>
<dd>the total number of bytes of the file(s) that we have. All this does
not necessarily has to be downloaded during this <a class="reference external" href="reference-Session.html#session">session</a> (that's
<tt class="docutils literal">total_payload_download</tt>).</dd>
</dl>
<a name="total_wanted_done"></a><dl class="docutils">
<dt>total_wanted_done</dt>
<dd>the number of bytes we have downloaded, only counting the pieces that
we actually want to download. i.e. excluding any pieces that we have
but have priority 0 (i.e. not wanted).</dd>
</dl>
<a name="total_wanted"></a><dl class="docutils">
<dt>total_wanted</dt>
<dd>The total number of bytes we want to download. This may be smaller
than the total torrent size in case any pieces are prioritized to 0,
i.e. not wanted</dd>
</dl>
<a name="all_time_upload"></a>
<a name="all_time_download"></a><dl class="docutils">
<dt>all_time_upload all_time_download</dt>
<dd>are accumulated upload and download payload byte counters. They are
saved in and restored from resume data to keep totals across sessions.</dd>
</dl>
<a name="added_time"></a><dl class="docutils">
<dt>added_time</dt>
<dd>the posix-time when this torrent was added. i.e. what <tt class="docutils literal">time(NULL)</tt>
returned at the time.</dd>
</dl>
<a name="completed_time"></a><dl class="docutils">
<dt>completed_time</dt>
<dd>the posix-time when this torrent was finished. If the torrent is not
yet finished, this is 0.</dd>
</dl>
<a name="last_seen_complete"></a><dl class="docutils">
<dt>last_seen_complete</dt>
<dd>the time when we, or one of our peers, last saw a complete copy of
this torrent.</dd>
</dl>
<a name="storage_mode"></a><dl class="docutils">
<dt>storage_mode</dt>
<dd>The allocation mode for the torrent. See <a class="reference external" href="reference-Storage.html#storage_mode_t">storage_mode_t</a> for the
options. For more information, see <a class="reference external" href="manual-ref.html#storage-allocation">storage allocation</a>.</dd>
</dl>
<a name="progress"></a><dl class="docutils">
<dt>progress</dt>
<dd>a value in the range [0, 1], that represents the progress of the
torrent's current task. It may be checking files or downloading.</dd>
</dl>
<a name="progress_ppm"></a><dl class="docutils">
<dt>progress_ppm</dt>
<dd>reflects the same value as <tt class="docutils literal">progress</tt>, but instead in a range [0,
1000000] (ppm = parts per million). When floating point operations are
disabled, this is the only alternative to the floating point value in
progress.</dd>
</dl>
<a name="queue_position"></a><dl class="docutils">
<dt>queue_position</dt>
<dd>the position this torrent has in the download
queue. If the torrent is a seed or finished, this is -1.</dd>
</dl>
<a name="download_rate"></a>
<a name="upload_rate"></a><dl class="docutils">
<dt>download_rate upload_rate</dt>
<dd>the total rates for all peers for this torrent. These will usually
have better precision than summing the rates from all peers. The rates
are given as the number of bytes per second.</dd>
</dl>
<a name="download_payload_rate"></a>
<a name="upload_payload_rate"></a><dl class="docutils">
<dt>download_payload_rate upload_payload_rate</dt>
<dd>the total transfer rate of payload only, not counting protocol
chatter. This might be slightly smaller than the other rates, but if
projected over a long time (e.g. when calculating ETA:s) the
difference may be noticeable.</dd>
</dl>
<a name="num_seeds"></a><dl class="docutils">
<dt>num_seeds</dt>
<dd>the number of peers that are seeding that this client is
currently connected to.</dd>
</dl>
<a name="num_peers"></a><dl class="docutils">
<dt>num_peers</dt>
<dd>the number of peers this torrent currently is connected to. Peer
connections that are in the half-open state (is attempting to connect)
or are queued for later connection attempt do not count. Although they
are visible in the peer list when you call <a class="reference external" href="reference-Core.html#get_peer_info()">get_peer_info()</a>.</dd>
</dl>
<a name="num_complete"></a>
<a name="num_incomplete"></a><dl class="docutils">
<dt>num_complete num_incomplete</dt>
<dd>if the tracker sends scrape info in its announce reply, these fields
will be set to the total number of peers that have the whole file and
the total number of peers that are still downloading. set to -1 if the
tracker did not send any scrape data in its announce reply.</dd>
</dl>
<a name="list_seeds"></a>
<a name="list_peers"></a><dl class="docutils">
<dt>list_seeds list_peers</dt>
<dd>the number of seeds in our peer list and the total number of peers
(including seeds). We are not necessarily connected to all the peers
in our peer list. This is the number of peers we know of in total,
including banned peers and peers that we have failed to connect to.</dd>
</dl>
<a name="connect_candidates"></a><dl class="docutils">
<dt>connect_candidates</dt>
<dd>the number of peers in this torrent's peer list that is a candidate to
be connected to. i.e. It has fewer connect attempts than the max fail
count, it is not a seed if we are a seed, it is not banned etc. If
this is 0, it means we don't know of any more peers that we can try.</dd>
</dl>
<a name="num_pieces"></a><dl class="docutils">
<dt>num_pieces</dt>
<dd>the number of pieces that has been downloaded. It is equivalent to:
<tt class="docutils literal"><span class="pre">std::accumulate(pieces-&gt;begin(),</span> <span class="pre">pieces-&gt;end())</span></tt>. So you don't have
to count yourself. This can be used to see if anything has updated
since last time if you want to keep a graph of the pieces up to date.</dd>
</dl>
<a name="distributed_full_copies"></a><dl class="docutils">
<dt>distributed_full_copies</dt>
<dd>the number of distributed copies of the torrent. Note that one copy
may be spread out among many peers. It tells how many copies there are
currently of the rarest piece(s) among the peers this client is
connected to.</dd>
</dl>
<a name="distributed_fraction"></a><dl class="docutils">
<dt>distributed_fraction</dt>
<dd><p class="first">tells the share of pieces that have more copies than the rarest
piece(s). Divide this number by 1000 to get the fraction.</p>
<p>For example, if <tt class="docutils literal">distributed_full_copies</tt> is 2 and
<tt class="docutils literal">distrbuted_fraction</tt> is 500, it means that the rarest pieces have
only 2 copies among the peers this torrent is connected to, and that
50% of all the pieces have more than two copies.</p>
<p class="last">If we are a seed, the piece picker is deallocated as an optimization,
and piece availability is no longer tracked. In this case the
distributed copies members are set to -1.</p>
</dd>
</dl>
<a name="distributed_copies"></a><dl class="docutils">
<dt>distributed_copies</dt>
<dd><p class="first">the number of distributed copies of the file. note that one copy may
be spread out among many peers. This is a floating point
representation of the distributed copies.</p>
<dl class="last docutils">
<dt>the integer part tells how many copies</dt>
<dd>there are of the rarest piece(s)</dd>
<dt>the fractional part tells the fraction of pieces that</dt>
<dd>have more copies than the rarest piece(s).</dd>
</dl>
</dd>
</dl>
<a name="block_size"></a><dl class="docutils">
<dt>block_size</dt>
<dd>the size of a block, in bytes. A block is a sub piece, it is the
number of bytes that each piece request asks for and the number of
bytes that each bit in the <tt class="docutils literal">partial_piece_info</tt>'s bitset represents,
see <a class="reference external" href="reference-Core.html#get_download_queue()">get_download_queue()</a>. This is typically 16 kB, but it may be
larger if the pieces are larger.</dd>
</dl>
<a name="num_uploads"></a><dl class="docutils">
<dt>num_uploads</dt>
<dd>the number of unchoked peers in this torrent.</dd>
</dl>
<a name="num_connections"></a><dl class="docutils">
<dt>num_connections</dt>
<dd>the number of peer connections this torrent has, including half-open
connections that hasn't completed the bittorrent handshake yet. This
is always &gt;= <tt class="docutils literal">num_peers</tt>.</dd>
</dl>
<a name="uploads_limit"></a><dl class="docutils">
<dt>uploads_limit</dt>
<dd>the set limit of upload slots (unchoked peers) for this torrent.</dd>
</dl>
<a name="connections_limit"></a><dl class="docutils">
<dt>connections_limit</dt>
<dd>the set limit of number of connections for this torrent.</dd>
</dl>
<a name="up_bandwidth_queue"></a>
<a name="down_bandwidth_queue"></a><dl class="docutils">
<dt>up_bandwidth_queue down_bandwidth_queue</dt>
<dd>the number of peers in this torrent that are waiting for more
bandwidth quota from the torrent rate limiter. This can determine if
the rate you get from this torrent is bound by the torrents limit or
not. If there is no limit set on this torrent, the peers might still
be waiting for bandwidth quota from the global limiter, but then they
are counted in the <tt class="docutils literal">session_status</tt> object.</dd>
</dl>
<a name="time_since_upload"></a>
<a name="time_since_download"></a><dl class="docutils">
<dt>time_since_upload time_since_download</dt>
<dd>the number of seconds since any peer last uploaded from this torrent
and the last time a downloaded piece passed the hash check,
respectively.</dd>
</dl>
<a name="active_time"></a>
<a name="finished_time"></a>
<a name="seeding_time"></a><dl class="docutils">
<dt>active_time finished_time seeding_time</dt>
<dd>These keep track of the number of seconds this torrent has been active
(not paused) and the number of seconds it has been active while being
finished and active while being a seed. <tt class="docutils literal">seeding_time</tt> should be &lt;=
<tt class="docutils literal">finished_time</tt> which should be &lt;= <tt class="docutils literal">active_time</tt>. They are all
saved in and restored from resume data, to keep totals across
sessions.</dd>
</dl>
<a name="seed_rank"></a><dl class="docutils">
<dt>seed_rank</dt>
<dd>A rank of how important it is to seed the torrent, it is used to
determine which torrents to seed and which to queue. It is based on
the peer to seed ratio from the tracker scrape. For more information,
see <a class="reference external" href="manual-ref.html#queuing">queuing</a>. Higher value means more important to seed</dd>
</dl>
<a name="last_scrape"></a><dl class="docutils">
<dt>last_scrape</dt>
<dd>the number of seconds since this torrent acquired scrape data.
If it has never done that, this value is -1.</dd>
</dl>
<a name="sparse_regions"></a><dl class="docutils">
<dt>sparse_regions</dt>
<dd>the number of regions of non-downloaded pieces in the torrent. This is
an interesting metric on windows vista, since there is a limit on the
number of sparse regions in a single file there.</dd>
</dl>
<a name="priority"></a><dl class="docutils">
<dt>priority</dt>
<dd>the priority of this torrent</dd>
</dl>
<a name="state"></a><dl class="docutils">
<dt>state</dt>
<dd>the main state the torrent is in. See <a class="reference external" href="reference-Core.html#state_t">torrent_status::state_t</a>.</dd>
</dl>
<a name="need_save_resume"></a><dl class="docutils">
<dt>need_save_resume</dt>
<dd>true if this torrent has unsaved changes
to its download state and statistics since the last resume data
was saved.</dd>
</dl>
<a name="ip_filter_applies"></a><dl class="docutils">
<dt>ip_filter_applies</dt>
<dd>true if the <a class="reference external" href="reference-Session.html#session">session</a> global IP filter applies
to this torrent. This defaults to true.</dd>
</dl>
<a name="upload_mode"></a><dl class="docutils">
<dt>upload_mode</dt>
<dd>true if the torrent is blocked from downloading. This typically
happens when a disk write operation fails. If the torrent is
auto-managed, it will periodically be taken out of this state, in the
hope that the disk condition (be it disk full or permission errors)
has been resolved. If the torrent is not auto-managed, you have to
explicitly take it out of the upload mode by calling <a class="reference external" href="reference-Core.html#set_upload_mode()">set_upload_mode()</a>
on the <a class="reference external" href="reference-Core.html#torrent_handle">torrent_handle</a>.</dd>
</dl>
<a name="share_mode"></a><dl class="docutils">
<dt>share_mode</dt>
<dd>true if the torrent is currently in share-mode, i.e. not downloading
the torrent, but just helping the swarm out.</dd>
</dl>
<a name="super_seeding"></a><dl class="docutils">
<dt>super_seeding</dt>
<dd>true if the torrent is in super seeding mode</dd>
</dl>
<a name="paused"></a><dl class="docutils">
<dt>paused</dt>
<dd>set to true if the torrent is paused and false otherwise. It's only
true if the torrent itself is paused. If the torrent is not running
because the <a class="reference external" href="reference-Session.html#session">session</a> is paused, this is still false. To know if a
torrent is active or not, you need to inspect both
<tt class="docutils literal"><span class="pre">torrent_status::paused</span></tt> and <tt class="docutils literal"><span class="pre">session::is_paused()</span></tt>.</dd>
</dl>
<a name="auto_managed"></a><dl class="docutils">
<dt>auto_managed</dt>
<dd>set to true if the torrent is auto managed, i.e. libtorrent is
responsible for determining whether it should be started or queued.
For more info see <a class="reference external" href="manual-ref.html#queuing">queuing</a></dd>
</dl>
<a name="sequential_download"></a><dl class="docutils">
<dt>sequential_download</dt>
<dd>true when the torrent is in sequential download mode. In this mode
pieces are downloaded in order rather than rarest first.</dd>
</dl>
<a name="is_seeding"></a><dl class="docutils">
<dt>is_seeding</dt>
<dd>true if all pieces have been downloaded.</dd>
</dl>
<a name="is_finished"></a><dl class="docutils">
<dt>is_finished</dt>
<dd>true if all pieces that have a priority &gt; 0 are downloaded. There is
only a distinction between finished and seeding if some pieces or
files have been set to priority 0, i.e. are not downloaded.</dd>
</dl>
<a name="has_metadata"></a><dl class="docutils">
<dt>has_metadata</dt>
<dd>true if this torrent has metadata (either it was started from a
.torrent file or the metadata has been downloaded). The only scenario
where this can be false is when the torrent was started torrent-less
(i.e. with just an info-hash and tracker ip, a magnet link for
instance).</dd>
</dl>
<a name="has_incoming"></a><dl class="docutils">
<dt>has_incoming</dt>
<dd>true if there has ever been an incoming connection attempt to this
torrent.</dd>
</dl>
<a name="seed_mode"></a><dl class="docutils">
<dt>seed_mode</dt>
<dd>true if the torrent is in seed_mode. If the torrent was started in
seed mode, it will leave seed mode once all pieces have been checked
or as soon as one piece fails the hash check.</dd>
</dl>
<a name="moving_storage"></a><dl class="docutils">
<dt>moving_storage</dt>
<dd>this is true if this torrent's storage is currently being moved from
one location to another. This may potentially be a long operation
if a large file ends up being copied from one drive to another.</dd>
</dl>
<a name="info_hash"></a><dl class="docutils">
<dt>info_hash</dt>
<dd>the info-hash for this torrent</dd>
</dl>
<a name="announce_entry"></a></div>
</div>
<div class="section" id="announce-entry">
<h1>announce_entry</h1>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/torrent_info.hpp">libtorrent/torrent_info.hpp</a>&quot;</p>
<p>this class holds information about one bittorrent tracker, as it
relates to a specific torrent.</p>
<pre class="literal-block">
struct announce_entry
{
<strong>announce_entry</strong> (std::string const&amp; u);
<strong>~announce_entry</strong> ();
<strong>announce_entry</strong> ();
int <strong>next_announce_in</strong> () const;
int <strong>min_announce_in</strong> () const;
void <strong>reset</strong> ();
void <strong>failed</strong> (session_settings const&amp; sett, int retry_interval = 0);
bool <strong>can_announce</strong> (ptime now, bool is_seed) const;
bool <strong>is_working</strong> () const;
void <strong>trim</strong> ();
enum tracker_source
{
source_torrent,
source_client,
source_magnet_link,
source_tex,
};
std::string url;
std::string trackerid;
std::string message;
error_code last_error;
ptime next_announce;
ptime min_announce;
int scrape_incomplete;
int scrape_complete;
int scrape_downloaded;
boost::uint8_t tier;
boost::uint8_t fail_limit;
boost::uint8_t fails:7;
bool updating:1;
boost::uint8_t source:4;
bool verified:1;
bool start_sent:1;
bool complete_sent:1;
bool send_stats:1;
};
</pre>
<a name="announce_entry()"></a>
<a name="~announce_entry()"></a><div class="section" id="announce-entry-announce-entry">
<h2>announce_entry() ~announce_entry()</h2>
<pre class="literal-block">
<strong>announce_entry</strong> (std::string const&amp; u);
<strong>~announce_entry</strong> ();
<strong>announce_entry</strong> ();
</pre>
<p>constructs a tracker announce <a class="reference external" href="reference-Bencoding.html#entry">entry</a> with <tt class="docutils literal">u</tt> as the URL.</p>
<a name="min_announce_in()"></a>
<a name="next_announce_in()"></a></div>
<div class="section" id="min-announce-in-next-announce-in">
<h2>min_announce_in() next_announce_in()</h2>
<pre class="literal-block">
int <strong>next_announce_in</strong> () const;
int <strong>min_announce_in</strong> () const;
</pre>
<p>returns the number of seconds to the next announce on
this tracker. <tt class="docutils literal">min_announce_in()</tt> returns the number of seconds until we are
allowed to force another tracker update with this tracker.</p>
<p>If the last time this tracker was contacted failed, <tt class="docutils literal">last_error</tt> is the error
code describing what error occurred.</p>
<a name="reset()"></a></div>
<div class="section" id="id125">
<h2>reset()</h2>
<pre class="literal-block">
void <strong>reset</strong> ();
</pre>
<p>reset announce counters and clears the started sent flag.
The <a class="reference external" href="reference-Core.html#announce_entry">announce_entry</a> will look like we've never talked to
the tracker.</p>
<a name="failed()"></a></div>
<div class="section" id="failed">
<h2>failed()</h2>
<pre class="literal-block">
void <strong>failed</strong> (session_settings const&amp; sett, int retry_interval = 0);
</pre>
<p>updates the failure counter and time-outs for re-trying.
This is called when the tracker announce fails.</p>
<a name="can_announce()"></a></div>
<div class="section" id="can-announce">
<h2>can_announce()</h2>
<pre class="literal-block">
bool <strong>can_announce</strong> (ptime now, bool is_seed) const;
</pre>
<p>returns true if we can announec to this tracker now.
The current time is passed in as <tt class="docutils literal">now</tt>. The <tt class="docutils literal">is_seed</tt>
argument is necessary because once we become a seed, we
need to announce right away, even if the re-announce timer
hasn't expired yet.</p>
<a name="is_working()"></a></div>
<div class="section" id="is-working">
<h2>is_working()</h2>
<pre class="literal-block">
bool <strong>is_working</strong> () const;
</pre>
<p>returns true if the last time we tried to announce to this
tracker succeeded, or if we haven't tried yet.</p>
<a name="trim()"></a></div>
<div class="section" id="trim">
<h2>trim()</h2>
<pre class="literal-block">
void <strong>trim</strong> ();
</pre>
<p>trims whitespace characters from the beginning of the URL.</p>
<a name="tracker_source"></a></div>
<div class="section" id="enum-tracker-source">
<h2>enum tracker_source</h2>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/torrent_info.hpp">libtorrent/torrent_info.hpp</a>&quot;</p>
<table border="1" class="docutils">
<colgroup>
<col width="20%" />
<col width="7%" />
<col width="73%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">name</th>
<th class="head">value</th>
<th class="head">description</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>source_torrent</td>
<td>1</td>
<td>the tracker was part of the .torrent file</td>
</tr>
<tr><td>source_client</td>
<td>2</td>
<td>the tracker was added programatically via the add_troacker()_ function</td>
</tr>
<tr><td>source_magnet_link</td>
<td>4</td>
<td>the tracker was part of a magnet link</td>
</tr>
<tr><td>source_tex</td>
<td>8</td>
<td>the tracker was received from the swarm via tracker exchange</td>
</tr>
</tbody>
</table>
<a name="url"></a><dl class="docutils">
<dt>url</dt>
<dd>tracker URL as it appeared in the torrent file</dd>
</dl>
<a name="trackerid"></a><dl class="docutils">
<dt>trackerid</dt>
<dd>the current <tt class="docutils literal">&amp;trackerid=</tt> argument passed to the tracker.
this is optional and is normally empty (in which case no
trackerid is sent).</dd>
</dl>
<a name="message"></a><dl class="docutils">
<dt>message</dt>
<dd>if this tracker has returned an error or warning message
that message is stored here</dd>
</dl>
<a name="last_error"></a><dl class="docutils">
<dt>last_error</dt>
<dd>if this tracker failed the last time it was contacted
this error code specifies what error occurred</dd>
</dl>
<a name="next_announce"></a><dl class="docutils">
<dt>next_announce</dt>
<dd>the time of next tracker announce</dd>
</dl>
<a name="min_announce"></a><dl class="docutils">
<dt>min_announce</dt>
<dd>no announces before this time</dd>
</dl>
<a name="scrape_incomplete"></a>
<a name="scrape_complete"></a>
<a name="scrape_downloaded"></a><dl class="docutils">
<dt>scrape_incomplete scrape_complete scrape_downloaded</dt>
<dd>if this tracker has returned scrape data, these fields are filled
in with valid numbers. Otherwise they are set to -1.
the number of current downloaders</dd>
</dl>
<a name="tier"></a><dl class="docutils">
<dt>tier</dt>
<dd>the tier this tracker belongs to</dd>
</dl>
<a name="fail_limit"></a><dl class="docutils">
<dt>fail_limit</dt>
<dd>the max number of failures to announce to this tracker in
a row, before this tracker is not used anymore. 0 means unlimited</dd>
</dl>
<a name="fails"></a><dl class="docutils">
<dt>fails</dt>
<dd>the number of times in a row we have failed to announce to this
tracker.</dd>
</dl>
<a name="updating"></a><dl class="docutils">
<dt>updating</dt>
<dd>true while we're waiting for a response from the tracker.</dd>
</dl>
<a name="source"></a><dl class="docutils">
<dt>source</dt>
<dd>a bitmask specifying which sources we got this tracker from.</dd>
</dl>
<a name="verified"></a><dl class="docutils">
<dt>verified</dt>
<dd>set to true the first time we receive a valid response
from this tracker.</dd>
</dl>
<a name="start_sent"></a><dl class="docutils">
<dt>start_sent</dt>
<dd>set to true when we get a valid response from an announce
with event=started. If it is set, we won't send start in the subsequent
announces.</dd>
</dl>
<a name="complete_sent"></a><dl class="docutils">
<dt>complete_sent</dt>
<dd>set to true when we send a event=completed.</dd>
</dl>
<a name="send_stats"></a><dl class="docutils">
<dt>send_stats</dt>
<dd>this is false the stats sent to this tracker will be 0</dd>
</dl>
<a name="torrent_info"></a></div>
</div>
<div class="section" id="torrent-info">
<h1>torrent_info</h1>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/torrent_info.hpp">libtorrent/torrent_info.hpp</a>&quot;</p>
<p>This class represents the information stored in a .torrent file</p>
<pre class="literal-block">
class torrent_info : public intrusive_ptr_base&lt;torrent_info&gt;
{
<strong>torrent_info</strong> (std::string const&amp; filename, int flags = 0);
<strong>torrent_info</strong> (char const* buffer, int size, error_code&amp; ec, int flags = 0);
<strong>torrent_info</strong> (sha1_hash const&amp; info_hash, int flags = 0);
<strong>torrent_info</strong> (lazy_entry const&amp; torrent_file, int flags = 0);
<strong>torrent_info</strong> (char const* buffer, int size, int flags = 0);
<strong>torrent_info</strong> (lazy_entry const&amp; torrent_file, error_code&amp; ec, int flags = 0);
<strong>torrent_info</strong> (torrent_info const&amp; t, int flags = 0);
<strong>torrent_info</strong> (std::string const&amp; filename, error_code&amp; ec, int flags = 0);
<strong>~torrent_info</strong> ();
file_storage const&amp; <strong>files</strong> () const;
file_storage const&amp; <strong>orig_files</strong> () const;
void <strong>rename_file</strong> (int index, std::string const&amp; new_filename);
void <strong>remap_files</strong> (file_storage const&amp; f);
std::vector&lt;announce_entry&gt; const&amp; <strong>trackers</strong> () const;
void <strong>add_tracker</strong> (std::string const&amp; url, int tier = 0);
void <strong>add_url_seed</strong> (std::string const&amp; url
, std::string const&amp; extern_auth = std::string()
, web_seed_entry::headers_t const&amp; extra_headers = web_seed_entry::headers_t());
std::vector&lt;web_seed_entry&gt; const&amp; <strong>web_seeds</strong> () const;
void <strong>add_http_seed</strong> (std::string const&amp; url
, std::string const&amp; extern_auth = std::string()
, web_seed_entry::headers_t const&amp; extra_headers = web_seed_entry::headers_t());
int <strong>num_pieces</strong> () const;
size_type <strong>total_size</strong> () const;
int <strong>piece_length</strong> () const;
const sha1_hash&amp; <strong>info_hash</strong> () const;
int <strong>num_files</strong> () const;
file_entry <strong>file_at</strong> (int index) const;
std::vector&lt;file_slice&gt; <strong>map_block</strong> (int piece, size_type offset, int size) const;
peer_request <strong>map_file</strong> (int file, size_type offset, int size) const;
std::string <strong>ssl_cert</strong> () const;
bool <strong>is_valid</strong> () const;
bool <strong>priv</strong> () const;
bool <strong>is_i2p</strong> () const;
sha1_hash <strong>hash_for_piece</strong> (int index) const;
char const* <strong>hash_for_piece_ptr</strong> (int index) const;
int <strong>piece_size</strong> (int index) const;
std::vector&lt;sha1_hash&gt; const&amp; <strong>merkle_tree</strong> () const;
void <strong>set_merkle_tree</strong> (std::vector&lt;sha1_hash&gt;&amp; h);
boost::optional&lt;time_t&gt; <strong>creation_date</strong> () const;
const std::string&amp; <strong>name</strong> () const;
const std::string&amp; <strong>comment</strong> () const;
const std::string&amp; <strong>creator</strong> () const;
nodes_t const&amp; <strong>nodes</strong> () const;
void <strong>add_node</strong> (std::pair&lt;std::string, int&gt; const&amp; node);
bool <strong>parse_info_section</strong> (lazy_entry const&amp; e, error_code&amp; ec, int flags);
lazy_entry const* <strong>info</strong> (char const* key) const;
void <strong>swap</strong> (torrent_info&amp; ti);
int <strong>metadata_size</strong> () const;
boost::shared_array&lt;char&gt; <strong>metadata</strong> () const;
bool <strong>is_merkle_torrent</strong> () const;
};
</pre>
<a name="torrent_info()"></a><div class="section" id="id129">
<h2>torrent_info()</h2>
<pre class="literal-block">
<strong>torrent_info</strong> (std::string const&amp; filename, int flags = 0);
<strong>torrent_info</strong> (char const* buffer, int size, error_code&amp; ec, int flags = 0);
<strong>torrent_info</strong> (sha1_hash const&amp; info_hash, int flags = 0);
<strong>torrent_info</strong> (lazy_entry const&amp; torrent_file, int flags = 0);
<strong>torrent_info</strong> (char const* buffer, int size, int flags = 0);
<strong>torrent_info</strong> (lazy_entry const&amp; torrent_file, error_code&amp; ec, int flags = 0);
<strong>torrent_info</strong> (torrent_info const&amp; t, int flags = 0);
<strong>torrent_info</strong> (std::string const&amp; filename, error_code&amp; ec, int flags = 0);
</pre>
<p>The constructor that takes an info-hash will initialize the info-hash to the given value,
but leave all other fields empty. This is used internally when downloading torrents without
the metadata. The metadata will be created by libtorrent as soon as it has been downloaded
from the swarm.</p>
<p>The constructor that takes a <a class="reference external" href="reference-Bencoding.html#lazy_entry">lazy_entry</a> will create a <a class="reference external" href="reference-Core.html#torrent_info">torrent_info</a> object from the
information found in the given torrent_file. The <a class="reference external" href="reference-Bencoding.html#lazy_entry">lazy_entry</a> represents a tree node in
an bencoded file. To load an ordinary .torrent file
into a <a class="reference external" href="reference-Bencoding.html#lazy_entry">lazy_entry</a>, use <a class="reference external" href="reference-Bencoding.html#lazy_bdecode()">lazy_bdecode()</a>.</p>
<p>The version that takes a buffer pointer and a size will decode it as a .torrent file and
initialize the <a class="reference external" href="reference-Core.html#torrent_info">torrent_info</a> object for you.</p>
<p>The version that takes a filename will simply load the torrent file and decode it inside
the constructor, for convenience. This might not be the most suitable for applications that
want to be able to report detailed errors on what might go wrong.</p>
<p>The overloads that takes an <tt class="docutils literal">error_code const&amp;</tt> never throws if an error occur, they
will simply set the error code to describe what went wrong and not fully initialize the
<a class="reference external" href="reference-Core.html#torrent_info">torrent_info</a> object. The overloads that do not take the extra error_code parameter will
always throw if an error occurs. These overloads are not available when building without
exception support.</p>
<p>The <tt class="docutils literal">flags</tt> argument is currently unused.</p>
<a name="~torrent_info()"></a></div>
<div class="section" id="id137">
<h2>~torrent_info()</h2>
<pre class="literal-block">
<strong>~torrent_info</strong> ();
</pre>
<p>frees all storage associated with this <a class="reference external" href="reference-Core.html#torrent_info">torrent_info</a> object</p>
<a name="orig_files()"></a>
<a name="files()"></a></div>
<div class="section" id="orig-files-files">
<h2>orig_files() files()</h2>
<pre class="literal-block">
file_storage const&amp; <strong>files</strong> () const;
file_storage const&amp; <strong>orig_files</strong> () const;
</pre>
<p>The <a class="reference external" href="reference-Storage.html#file_storage">file_storage</a> object contains the information on how to map the pieces to
files. It is separated from the <a class="reference external" href="reference-Core.html#torrent_info">torrent_info</a> object because when creating torrents
a storage object needs to be created without having a torrent file. When renaming files
in a storage, the storage needs to make its own copy of the <a class="reference external" href="reference-Storage.html#file_storage">file_storage</a> in order
to make its mapping differ from the one in the torrent file.</p>
<p><tt class="docutils literal">orig_files()</tt> returns the original (unmodified) file storage for this torrent. This
is used by the web server connection, which needs to request files with the original
names. Filename may be chaged using <tt class="docutils literal"><span class="pre">torrent_info::rename_file()</span></tt>.</p>
<p>For more information on the <a class="reference external" href="reference-Storage.html#file_storage">file_storage</a> object, see the separate document on how
to create torrents.</p>
<a name="rename_file()"></a></div>
<div class="section" id="id143">
<h2>rename_file()</h2>
<pre class="literal-block">
void <strong>rename_file</strong> (int index, std::string const&amp; new_filename);
</pre>
<p>Renames a the file with the specified index to the new name. The new filename is
reflected by the <tt class="docutils literal">file_storage</tt> returned by <tt class="docutils literal">files()</tt> but not by the one
returned by <tt class="docutils literal">orig_files()</tt>.</p>
<p>If you want to rename the base name of the torrent (for a multifile torrent), you
can copy the <tt class="docutils literal">file_storage</tt> (see <a class="reference external" href="reference-Core.html#files()">files()</a> and <a class="reference external" href="reference-Core.html#orig_files()">orig_files()</a> ), change the name, and
then use <a class="reference internal" href="#remap-files">remap_files()</a>.</p>
<p>The <tt class="docutils literal">new_filename</tt> can both be a relative path, in which case the file name
is relative to the <tt class="docutils literal">save_path</tt> of the torrent. If the <tt class="docutils literal">new_filename</tt> is
an absolute path (i.e. <tt class="docutils literal">is_complete(new_filename) == true</tt>), then the file
is detached from the <tt class="docutils literal">save_path</tt> of the torrent. In this case the file is
not moved when <a class="reference external" href="reference-Core.html#move_storage()">move_storage()</a> is invoked.</p>
<a name="remap_files()"></a></div>
<div class="section" id="remap-files">
<h2>remap_files()</h2>
<pre class="literal-block">
void <strong>remap_files</strong> (file_storage const&amp; f);
</pre>
<p>Remaps the file storage to a new file layout. This can be used to, for instance,
download all data in a torrent to a single file, or to a number of fixed size
sector aligned files, regardless of the number and sizes of the files in the torrent.</p>
<p>The new specified <tt class="docutils literal">file_storage</tt> must have the exact same size as the current one.</p>
<a name="trackers()"></a>
<a name="add_tracker()"></a></div>
<div class="section" id="trackers-add-tracker">
<h2>trackers() add_tracker()</h2>
<pre class="literal-block">
std::vector&lt;announce_entry&gt; const&amp; <strong>trackers</strong> () const;
void <strong>add_tracker</strong> (std::string const&amp; url, int tier = 0);
</pre>
<p><tt class="docutils literal">add_tracker()</tt> adds a tracker to the announce-list. The <tt class="docutils literal">tier</tt> determines the order in
which the trackers are to be tried.</p>
<p>The <tt class="docutils literal">trackers()</tt> function will return a sorted vector of <tt class="docutils literal">announce_entry</tt>.
Each announce <a class="reference external" href="reference-Bencoding.html#entry">entry</a> contains a string, which is the tracker url, and a tier index. The
tier index is the high-level priority. No matter which trackers that works or not, the
ones with lower tier will always be tried before the one with higher tier number.
For more information, see <a class="reference internal" href="#announce-entry">announce_entry</a>.</p>
<a name="add_url_seed()"></a>
<a name="add_http_seed()"></a>
<a name="web_seeds()"></a></div>
<div class="section" id="add-url-seed-add-http-seed-web-seeds">
<h2>add_url_seed() add_http_seed() web_seeds()</h2>
<pre class="literal-block">
void <strong>add_url_seed</strong> (std::string const&amp; url
, std::string const&amp; extern_auth = std::string()
, web_seed_entry::headers_t const&amp; extra_headers = web_seed_entry::headers_t());
std::vector&lt;web_seed_entry&gt; const&amp; <strong>web_seeds</strong> () const;
void <strong>add_http_seed</strong> (std::string const&amp; url
, std::string const&amp; extern_auth = std::string()
, web_seed_entry::headers_t const&amp; extra_headers = web_seed_entry::headers_t());
</pre>
<p><tt class="docutils literal">web_seeds()</tt> returns all url seeds and http seeds in the torrent. Each <a class="reference external" href="reference-Bencoding.html#entry">entry</a>
is a <tt class="docutils literal">web_seed_entry</tt> and may refer to either a url seed or http seed.</p>
<p><tt class="docutils literal">add_url_seed()</tt> and <tt class="docutils literal">add_http_seed()</tt> adds one url to the list of
url/http seeds. Currently, the only transport protocol supported for the url
is http.</p>
<p>The <tt class="docutils literal">extern_auth</tt> argument can be used for other athorization schemese than
basic HTTP authorization. If set, it will override any username and password
found in the URL itself. The string will be sent as the HTTP authorization header's
value (without specifying &quot;Basic&quot;).</p>
<p>The <tt class="docutils literal">extra_headers</tt> argument defaults to an empty list, but can be used to
insert custom HTTP headers in the requests to a specific web seed.</p>
<p>See <a class="reference external" href="manual-ref.html#http-seeding">http seeding</a> for more information.</p>
<a name="piece_length()"></a>
<a name="num_pieces()"></a>
<a name="total_size()"></a></div>
<div class="section" id="piece-length-num-pieces-total-size">
<h2>piece_length() num_pieces() total_size()</h2>
<pre class="literal-block">
int <strong>num_pieces</strong> () const;
size_type <strong>total_size</strong> () const;
int <strong>piece_length</strong> () const;
</pre>
<p><tt class="docutils literal">total_size()</tt>, <tt class="docutils literal">piece_length()</tt> and <tt class="docutils literal">num_pieces()</tt> returns the total
number of bytes the torrent-file represents (all the files in it), the number of byte for
each piece and the total number of pieces, respectively. The difference between
<tt class="docutils literal">piece_size()</tt> and <tt class="docutils literal">piece_length()</tt> is that <tt class="docutils literal">piece_size()</tt> takes
the piece index as argument and gives you the exact size of that piece. It will always
be the same as <tt class="docutils literal">piece_length()</tt> except in the case of the last piece, which may
be smaller.</p>
<a name="info_hash()"></a></div>
<div class="section" id="id150">
<h2>info_hash()</h2>
<pre class="literal-block">
const sha1_hash&amp; <strong>info_hash</strong> () const;
</pre>
<p>returns the info-hash of the torrent</p>
<a name="num_files()"></a>
<a name="file_at()"></a></div>
<div class="section" id="num-files-file-at">
<h2>num_files() file_at()</h2>
<pre class="literal-block">
int <strong>num_files</strong> () const;
file_entry <strong>file_at</strong> (int index) const;
</pre>
<p>If you need index-access to files you can use the <tt class="docutils literal">num_files()</tt> and <tt class="docutils literal">file_at()</tt>
to access files using indices.</p>
<a name="map_block()"></a></div>
<div class="section" id="map-block">
<h2>map_block()</h2>
<pre class="literal-block">
std::vector&lt;file_slice&gt; <strong>map_block</strong> (int piece, size_type offset, int size) const;
</pre>
<p>This function will map a piece index, a byte offset within that piece and
a size (in bytes) into the corresponding files with offsets where that data
for that piece is supposed to be stored. See <a class="reference external" href="reference-Storage.html#file_slice">file_slice</a>.</p>
<a name="map_file()"></a></div>
<div class="section" id="map-file">
<h2>map_file()</h2>
<pre class="literal-block">
peer_request <strong>map_file</strong> (int file, size_type offset, int size) const;
</pre>
<p>This function will map a range in a specific file into a range in the torrent.
The <tt class="docutils literal">file_offset</tt> parameter is the offset in the file, given in bytes, where
0 is the start of the file. See <a class="reference external" href="reference-Core.html#peer_request">peer_request</a>.</p>
<p>The input range is assumed to be valid within the torrent. <tt class="docutils literal">file_offset</tt>
+ <tt class="docutils literal">size</tt> is not allowed to be greater than the file size. <tt class="docutils literal">file_index</tt>
must refer to a valid file, i.e. it cannot be &gt;= <tt class="docutils literal">num_files()</tt>.</p>
<a name="ssl_cert()"></a></div>
<div class="section" id="ssl-cert">
<h2>ssl_cert()</h2>
<pre class="literal-block">
std::string <strong>ssl_cert</strong> () const;
</pre>
<p>Returns the SSL root certificate for the torrent, if it is an SSL
torrent. Otherwise returns an empty string. The certificate is
the the public certificate in x509 format.</p>
<a name="is_valid()"></a></div>
<div class="section" id="id153">
<h2>is_valid()</h2>
<pre class="literal-block">
bool <strong>is_valid</strong> () const;
</pre>
<p>returns true if this <a class="reference external" href="reference-Core.html#torrent_info">torrent_info</a> object has a torrent loaded.
This is primarily used to determine if a magnet link has had its
metadata resolved yet or not.</p>
<a name="priv()"></a></div>
<div class="section" id="priv">
<h2>priv()</h2>
<pre class="literal-block">
bool <strong>priv</strong> () const;
</pre>
<p>returns true if this torrent is private. i.e., it should not be
distributed on the trackerless network (the kademlia DHT).</p>
<a name="is_i2p()"></a></div>
<div class="section" id="is-i2p">
<h2>is_i2p()</h2>
<pre class="literal-block">
bool <strong>is_i2p</strong> () const;
</pre>
<p>returns true if this is an i2p torrent. This is determined by whether
or not it has a tracker whose URL domain name ends with &quot;.i2p&quot;. i2p
torrents disable the DHT and local peer discovery as well as talking
to peers over anything other than the i2p network.</p>
<a name="hash_for_piece_ptr()"></a>
<a name="hash_for_piece()"></a>
<a name="piece_size()"></a></div>
<div class="section" id="hash-for-piece-ptr-hash-for-piece-piece-size">
<h2>hash_for_piece_ptr() hash_for_piece() piece_size()</h2>
<pre class="literal-block">
sha1_hash <strong>hash_for_piece</strong> (int index) const;
char const* <strong>hash_for_piece_ptr</strong> (int index) const;
int <strong>piece_size</strong> (int index) const;
</pre>
<p><tt class="docutils literal">hash_for_piece()</tt> takes a piece-index and returns the 20-bytes sha1-hash for that
piece and <tt class="docutils literal">info_hash()</tt> returns the 20-bytes sha1-hash for the info-section of the
torrent file.
<tt class="docutils literal">hash_for_piece_ptr()</tt> returns a pointer to the 20 byte sha1 digest for the piece.
Note that the string is not null-terminated.</p>
<a name="set_merkle_tree()"></a>
<a name="merkle_tree()"></a></div>
<div class="section" id="set-merkle-tree-merkle-tree">
<h2>set_merkle_tree() merkle_tree()</h2>
<pre class="literal-block">
std::vector&lt;sha1_hash&gt; const&amp; <strong>merkle_tree</strong> () const;
void <strong>set_merkle_tree</strong> (std::vector&lt;sha1_hash&gt;&amp; h);
</pre>
<p><tt class="docutils literal">merkle_tree()</tt> returns a reference to the merkle tree for this torrent, if any.</p>
<p><tt class="docutils literal">set_merkle_tree()</tt> moves the passed in merkle tree into the <a class="reference external" href="reference-Core.html#torrent_info">torrent_info</a> object.
i.e. <tt class="docutils literal">h</tt> will not be identical after the call. You need to set the merkle tree for
a torrent that you've just created (as a merkle torrent). The merkle tree is retrieved
from the <tt class="docutils literal"><span class="pre">create_torrent::merkle_tree()</span></tt> function, and need to be saved separately
from the torrent file itself. Once it's added to libtorrent, the merkle tree will be
persisted in the resume data.</p>
<a name="creator()"></a>
<a name="creation_date()"></a>
<a name="name()"></a>
<a name="comment()"></a></div>
<div class="section" id="creator-creation-date-name-comment">
<h2>creator() creation_date() name() comment()</h2>
<pre class="literal-block">
boost::optional&lt;time_t&gt; <strong>creation_date</strong> () const;
const std::string&amp; <strong>name</strong> () const;
const std::string&amp; <strong>comment</strong> () const;
const std::string&amp; <strong>creator</strong> () const;
</pre>
<p><tt class="docutils literal">name()</tt> returns the name of the torrent.</p>
<p><tt class="docutils literal">comment()</tt> returns the comment associated with the torrent. If there's no comment,
it will return an empty string. <tt class="docutils literal">creation_date()</tt> returns the creation date of
the torrent as time_t (<a class="reference external" href="http://www.opengroup.org/onlinepubs/009695399/functions/time.html">posix time</a>). If there's no time stamp in the torrent file,
the optional object will be uninitialized.</p>
<p>Both the name and the comment is UTF-8 encoded strings.</p>
<p><tt class="docutils literal">creator()</tt> returns the creator string in the torrent. If there is no creator string
it will return an empty string.</p>
<a name="nodes()"></a></div>
<div class="section" id="nodes">
<h2>nodes()</h2>
<pre class="literal-block">
nodes_t const&amp; <strong>nodes</strong> () const;
</pre>
<p>If this torrent contains any DHT nodes, they are put in this vector in their original
form (host name and port number).</p>
<a name="add_node()"></a></div>
<div class="section" id="add-node">
<h2>add_node()</h2>
<pre class="literal-block">
void <strong>add_node</strong> (std::pair&lt;std::string, int&gt; const&amp; node);
</pre>
<p>This is used when creating torrent. Use this to add a known DHT node. It may
be used, by the client, to bootstrap into the DHT network.</p>
<a name="parse_info_section()"></a></div>
<div class="section" id="parse-info-section">
<h2>parse_info_section()</h2>
<pre class="literal-block">
bool <strong>parse_info_section</strong> (lazy_entry const&amp; e, error_code&amp; ec, int flags);
</pre>
<p>populates the <a class="reference external" href="reference-Core.html#torrent_info">torrent_info</a> by providing just the info-dict buffer. This is used when
loading a torrent from a magnet link for instance, where we only have the info-dict.
The <a class="reference external" href="reference-Bencoding.html#lazy_entry">lazy_entry</a> <tt class="docutils literal">e</tt> points to a parsed info-dictionary. <tt class="docutils literal">ec</tt> returns an error code
if something fails (typically if the info dictionary is malformed). <tt class="docutils literal">flags</tt> are currently
unused.</p>
<a name="info()"></a></div>
<div class="section" id="info">
<h2>info()</h2>
<pre class="literal-block">
lazy_entry const* <strong>info</strong> (char const* key) const;
</pre>
<p>This function looks up keys from the info-dictionary of the loaded torrent file.
It can be used to access extension values put in the .torrent file. If the specified
key cannot be found, it returns NULL.</p>
<a name="swap()"></a></div>
<div class="section" id="id158">
<h2>swap()</h2>
<pre class="literal-block">
void <strong>swap</strong> (torrent_info&amp; ti);
</pre>
<p>swap the content of this and <tt class="docutils literal">ti`</tt>.</p>
<a name="metadata_size()"></a>
<a name="metadata()"></a></div>
<div class="section" id="metadata-size-metadata">
<h2>metadata_size() metadata()</h2>
<pre class="literal-block">
int <strong>metadata_size</strong> () const;
boost::shared_array&lt;char&gt; <strong>metadata</strong> () const;
</pre>
<p><tt class="docutils literal">metadata()</tt> returns a the raw info section of the torrent file. The size
of the metadata is returned by <tt class="docutils literal">metadata_size()</tt>.</p>
<a name="is_merkle_torrent()"></a></div>
<div class="section" id="is-merkle-torrent">
<h2>is_merkle_torrent()</h2>
<pre class="literal-block">
bool <strong>is_merkle_torrent</strong> () const;
</pre>
<p>returns whether or not this is a merkle torrent.
see <a class="reference external" href="http://bittorrent.org/beps/bep_0030.html">BEP30</a>.</p>
<a name="make_magnet_uri()"></a></div>
<div class="section" id="make-magnet-uri">
<h2>make_magnet_uri()</h2>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/magnet_uri.hpp">libtorrent/magnet_uri.hpp</a>&quot;</p>
<pre class="literal-block">
std::string <strong>make_magnet_uri</strong> (torrent_handle const&amp; handle);
std::string <strong>make_magnet_uri</strong> (torrent_info const&amp; info);
</pre>
<p>Generates a magnet URI from the specified torrent. If the torrent
handle is invalid, an empty string is returned.</p>
<p>For more information about magnet links, see <a class="reference external" href="manual-ref.html#magnet-links">magnet links</a>.</p>
<a name="parse_magnet_uri()"></a></div>
<div class="section" id="parse-magnet-uri">
<h2>parse_magnet_uri()</h2>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/magnet_uri.hpp">libtorrent/magnet_uri.hpp</a>&quot;</p>
<pre class="literal-block">
void <strong>parse_magnet_uri</strong> (std::string const&amp; uri, add_torrent_params&amp; p, error_code&amp; ec);
</pre>
<p>This function parses out information from the magnet link and populates the
<a class="reference external" href="reference-Session.html#add_torrent_params">add_torrent_params</a> object.</p>
<a name="hash_value()"></a></div>
<div class="section" id="hash-value">
<h2>hash_value()</h2>
<p>Declared in &quot;<a class="reference external" href="../include/libtorrent/torrent_handle.hpp">libtorrent/torrent_handle.hpp</a>&quot;</p>
<pre class="literal-block">
std::size_t <strong>hash_value</strong> (torrent_status const&amp; ts);
</pre>
<p>allows <a class="reference external" href="reference-Core.html#torrent_handle">torrent_handle</a> to be used in unordered_map and unordered_set.</p>
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