Sweden-Number/dlls/mapi32/tests/mapi32_test.h

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/*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
/*
* Return FALSE if no default mail client is installed.
*/
static BOOL HaveDefaultMailClient(void)
{
HKEY Key;
DWORD Type, Size;
BYTE Buffer[64];
BOOL HasHKCUKey;
/* We check the default value of both HKCU\Software\Clients\Mail and
* HKLM\Software\Clients\Mail, if one of them is present there is a default
* mail client. If neither of these keys is present, we might be running
* on an old Windows version (W95, NT4) and we assume a default mail client
* might be available. Only if one of the keys is present, but there is
* no default value do we assume there is no default client. */
if (RegOpenKeyExA(HKEY_CURRENT_USER, "SOFTWARE\\Clients\\Mail", 0, KEY_QUERY_VALUE, &Key) == ERROR_SUCCESS)
{
Size = sizeof(Buffer);
/* Any return value besides ERROR_FILE_NOT_FOUND (including success,
ERROR_MORE_DATA) indicates the value is present */
if (RegQueryValueExA(Key, NULL, NULL, &Type, Buffer, &Size) != ERROR_FILE_NOT_FOUND)
{
RegCloseKey(Key);
return TRUE;
}
RegCloseKey(Key);
HasHKCUKey = TRUE;
}
else
HasHKCUKey = FALSE;
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, "SOFTWARE\\Clients\\Mail", 0, KEY_QUERY_VALUE, &Key) == ERROR_SUCCESS)
{
Size = sizeof(Buffer);
if (RegQueryValueExA(Key, NULL, NULL, &Type, Buffer, &Size) != ERROR_FILE_NOT_FOUND)
{
RegCloseKey(Key);
return TRUE;
}
RegCloseKey(Key);
return FALSE;
}
return ! HasHKCUKey;
}