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<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="generator" content="Docutils 0.3.9: http://docutils.sourceforge.net/" />
<title>libtorrent Examples</title>
<meta name="author" content="Arvid Norberg, arvid&#64;rasterbar.com" />
<link rel="stylesheet" href="style.css" type="text/css" />
</head>
<body>
<div class="document" id="libtorrent-examples">
<h1 class="title">libtorrent Examples</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" href="mailto:arvid&#64;rasterbar.com">arvid&#64;rasterbar.com</a></td></tr>
</tbody>
</table>
<div class="contents topic" id="table-of-contents">
<p class="topic-title first"><a name="table-of-contents">Table of contents</a></p>
<ul class="simple">
<li><a class="reference" href="#examples" id="id2" name="id2">examples</a><ul>
<li><a class="reference" href="#dump-torrent" id="id3" name="id3">dump_torrent</a></li>
<li><a class="reference" href="#simple-client" id="id4" name="id4">simple client</a></li>
<li><a class="reference" href="#make-torrent" id="id5" name="id5">make_torrent</a></li>
</ul>
</li>
</ul>
</div>
<div class="section" id="examples">
<h1><a name="examples">examples</a></h1>
<p>Except for the example programs in this manual, there's also a bigger example
of a (little bit) more complete client, <tt class="docutils literal"><span class="pre">client_test</span></tt>. There are separate
instructions for how to use it <a class="reference" href="client_test.html">here</a> if you'd like to try it. Note that building
<tt class="docutils literal"><span class="pre">client_test</span></tt> also requires boost.regex and boost.program_options library.</p>
<div class="section" id="dump-torrent">
<h2><a name="dump-torrent">dump_torrent</a></h2>
<p>This is an example of a program that will take a torrent-file as a parameter and
print information about it to std out:</p>
<pre class="literal-block">
#include &lt;iostream&gt;
#include &lt;fstream&gt;
#include &lt;iterator&gt;
#include &lt;iomanip&gt;
#include &quot;libtorrent/entry.hpp&quot;
#include &quot;libtorrent/bencode.hpp&quot;
#include &quot;libtorrent/torrent_info.hpp&quot;
int main(int argc, char* argv[])
{
using namespace libtorrent;
if (argc != 2)
{
std::cerr &lt;&lt; &quot;usage: dump_torrent torrent-file\n&quot;;
return 1;
}
try
{
std::ifstream in(argv[1], std::ios_base::binary);
in.unsetf(std::ios_base::skipws);
entry e = bdecode(std::istream_iterator&lt;char&gt;(in)
, std::istream_iterator&lt;char&gt;());
std::cout &lt;&lt; &quot;\n\n----- raw info -----\n\n&quot;;
e.print(std::cout);
torrent_info t(e);
// print info about torrent
std::cout &lt;&lt; &quot;\n\n----- torrent file info -----\n\n&quot;;
std::cout &lt;&lt; &quot;nodes:\n&quot;;
typedef std::vector&lt;std::pair&lt;std::string, int&gt; &gt; node_vec;
node_vec const&amp; nodes = t.nodes();
for (node_vec::const_iterator i = nodes.begin(), end(nodes.end());
i != end; ++i)
{
std::cout &lt;&lt; i-&gt;first &lt;&lt; &quot;:&quot; &lt;&lt; i-&gt;second &lt;&lt; &quot;\n&quot;;
}
std::cout &lt;&lt; &quot;trackers:\n&quot;;
for (std::vector&lt;announce_entry&gt;::const_iterator i
= t.trackers().begin(); i != t.trackers().end(); ++i)
{
std::cout &lt;&lt; i-&gt;tier &lt;&lt; &quot;: &quot; &lt;&lt; i-&gt;url &lt;&lt; &quot;\n&quot;;
}
std::cout &lt;&lt; &quot;number of pieces: &quot; &lt;&lt; t.num_pieces() &lt;&lt; &quot;\n&quot;;
std::cout &lt;&lt; &quot;piece length: &quot; &lt;&lt; t.piece_length() &lt;&lt; &quot;\n&quot;;
std::cout &lt;&lt; &quot;info hash: &quot; &lt;&lt; t.info_hash() &lt;&lt; &quot;\n&quot;;
std::cout &lt;&lt; &quot;comment: &quot; &lt;&lt; t.comment() &lt;&lt; &quot;\n&quot;;
std::cout &lt;&lt; &quot;created by: &quot; &lt;&lt; t.creator() &lt;&lt; &quot;\n&quot;;
std::cout &lt;&lt; &quot;files:\n&quot;;
for (torrent_info::file_iterator i = t.begin_files();
i != t.end_files(); ++i)
{
std::cout &lt;&lt; &quot; &quot; &lt;&lt; std::setw(11) &lt;&lt; i-&gt;size
&lt;&lt; &quot; &quot; &lt;&lt; i-&gt;path.string() &lt;&lt; &quot;\n&quot;;
}
}
catch (std::exception&amp; e)
{
std::cout &lt;&lt; e.what() &lt;&lt; &quot;\n&quot;;
}
return 0;
}
</pre>
</div>
<div class="section" id="simple-client">
<h2><a name="simple-client">simple client</a></h2>
<p>This is a simple client. It doesn't have much output to keep it simple:</p>
<pre class="literal-block">
#include &lt;iostream&gt;
#include &lt;fstream&gt;
#include &lt;iterator&gt;
#include &lt;exception&gt;
#include &lt;boost/format.hpp&gt;
#include &lt;boost/date_time/posix_time/posix_time.hpp&gt;
#include &quot;libtorrent/entry.hpp&quot;
#include &quot;libtorrent/bencode.hpp&quot;
#include &quot;libtorrent/session.hpp&quot;
int main(int argc, char* argv[])
{
using namespace libtorrent;
if (argc != 2)
{
std::cerr &lt;&lt; &quot;usage: ./simple_cient torrent-file\n&quot;
&quot;to stop the client, press return.\n&quot;;
return 1;
}
try
{
session s;
s.listen_on(std::make_pair(6881, 6889));
std::ifstream in(argv[1], std::ios_base::binary);
in.unsetf(std::ios_base::skipws);
entry e = bdecode(std::istream_iterator&lt;char&gt;(in)
, std::istream_iterator&lt;char&gt;());
s.add_torrent(torrent_info(e), &quot;&quot;);
// wait for the user to end
char a;
std::cin.unsetf(std::ios_base::skipws);
std::cin &gt;&gt; a;
}
catch (std::exception&amp; e)
{
std::cout &lt;&lt; e.what() &lt;&lt; &quot;\n&quot;;
}
return 0;
}
</pre>
</div>
<div class="section" id="make-torrent">
<h2><a name="make-torrent">make_torrent</a></h2>
<p>Shows how to create a torrent from a directory tree:</p>
<pre class="literal-block">
#include &lt;iostream&gt;
#include &lt;fstream&gt;
#include &lt;iterator&gt;
#include &lt;iomanip&gt;
#include &quot;libtorrent/entry.hpp&quot;
#include &quot;libtorrent/bencode.hpp&quot;
#include &quot;libtorrent/torrent_info.hpp&quot;
#include &quot;libtorrent/file.hpp&quot;
#include &quot;libtorrent/storage.hpp&quot;
#include &quot;libtorrent/hasher.hpp&quot;
#include &lt;boost/filesystem/operations.hpp&gt;
#include &lt;boost/filesystem/path.hpp&gt;
#include &lt;boost/filesystem/fstream.hpp&gt;
using namespace boost::filesystem;
using namespace libtorrent;
void add_files(torrent_info&amp; t, path const&amp; p, path const&amp; l)
{
path f(p / l);
if (is_directory(f))
{
for (directory_iterator i(f), end; i != end; ++i)
add_files(t, p, l / i-&gt;leaf());
}
else
{
std::cerr &lt;&lt; &quot;adding \&quot;&quot; &lt;&lt; l.string() &lt;&lt; &quot;\&quot;\n&quot;;
file fi(f, file::in);
fi.seek(0, file::end);
libtorrent::size_type size = fi.tell();
t.add_file(l, size);
}
}
int main(int argc, char* argv[])
{
using namespace libtorrent;
using namespace boost::filesystem;
if (argc != 4)
{
std::cerr &lt;&lt; &quot;usage: make_torrent &lt;output torrent-file&gt; &quot;
&quot;&lt;announce url&gt; &lt;file or directory to create torrent from&gt;\n&quot;;
return 1;
}
boost::filesystem::path::default_name_check(native);
try
{
torrent_info t;
path full_path = initial_path() / path(argv[3]);
ofstream out(initial_path() / path(argv[1]), std::ios_base::binary);
int piece_size = 256 * 1024;
char const* creator_str = &quot;libtorrent&quot;;
add_files(t, full_path.branch_path(), full_path.leaf());
t.set_piece_size(piece_size);
storage st(t, full_path.branch_path());
t.add_tracker(argv[2]);
// calculate the hash for all pieces
int num = t.num_pieces();
std::vector&lt;char&gt; buf(piece_size);
for (int i = 0; i &lt; num; ++i)
{
st.read(&amp;buf[0], i, 0, t.piece_size(i));
hasher h(&amp;buf[0], t.piece_size(i));
t.set_hash(i, h.final());
std::cerr &lt;&lt; (i+1) &lt;&lt; &quot;/&quot; &lt;&lt; num &lt;&lt; &quot;\r&quot;;
}
t.set_creator(creator_str);
// create the torrent and print it to out
entry e = t.create_torrent();
libtorrent::bencode(std::ostream_iterator&lt;char&gt;(out), e);
}
catch (std::exception&amp; e)
{
std::cerr &lt;&lt; e.what() &lt;&lt; &quot;\n&quot;;
}
return 0;
}
</pre>
</div>
</div>
</div>
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