src/win32/plugin.c

   1 /*****************************************************************************
   2  * plugin.c : Low-level dynamic library handling
   3  *****************************************************************************
   4  * Copyright (C) 2001-2011 VLC authors and VideoLAN
   5  *
   6  * Authors: Sam Hocevar <sam@zoy.org>
   7  *          Ethan C. Baldridge <BaldridgeE@cadmus.com>
   8  *          Hans-Peter Jansen <hpj@urpla.net>
   9  *          Gildas Bazin <gbazin@videolan.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify it
  12  * under the terms of the GNU Lesser General Public License as published by
  13  * the Free Software Foundation; either version 2.1 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  19  * GNU Lesser General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU Lesser General Public License
  22  * along with this program; if not, write to the Free Software Foundation,
  23  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  24  *****************************************************************************/
  25
  26 #ifdef HAVE_CONFIG_H
  27 # include "config.h"
  28 #endif
  29
  30 #include <vlc_common.h>
  31 #include <vlc_charset.h>
  32 #include "modules/modules.h"
  33 #include <windows.h>
  34 #include <wchar.h>
  35
  36 static char *GetWindowsError( void )
  37 {
  38     wchar_t wmsg[256];
  39     int i = 0, i_error = GetLastError();
  40
  41     FormatMessageW( FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
  42                     NULL, i_error, MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),
  43                     wmsg, 256, NULL );
  44
  45     /* Go to the end of the string */
  46     while( !wmemchr( L"\r\n\0", wmsg[i], 3 ) )
  47         i++;
  48
  49     snwprintf( wmsg + i, 256 - i, L" (error %i)", i_error );
  50     return FromWide( wmsg );
  51 }
  52
  53 int module_Load( vlc_object_t *p_this, const char *psz_file,
  54                  module_handle_t *p_handle, bool lazy )
  55 {
  56     wchar_t *wfile = ToWide (psz_file);
  57     if (wfile == NULL)
  58         return -1;
  59
  60     module_handle_t handle = NULL;
  61 #if !VLC_WINSTORE_APP
  62     DWORD mode;
  63     if (SetThreadErrorMode (SEM_FAILCRITICALERRORS, &mode) != 0)
  64     {
  65         handle = LoadLibraryExW(wfile, NULL, LOAD_LIBRARY_SEARCH_SYSTEM32);
  66         SetThreadErrorMode (mode, NULL);
  67     }
  68 #else
  69     handle = LoadPackagedLibrary( wfile, 0 );
  70 #endif
  71     free (wfile);
  72
  73     if( handle == NULL )
  74     {
  75         char *psz_err = GetWindowsError();
  76         msg_Warn( p_this, "cannot load module `%s' (%s)", psz_file, psz_err );
  77         free( psz_err );
  78         return -1;
  79     }
  80
  81     *p_handle = handle;
  82     (void) lazy;
  83     return 0;
  84 }
  85
  86 void module_Unload( module_handle_t handle )
  87 {
  88     FreeLibrary( handle );
  89 }
  90
  91 void *module_Lookup( module_handle_t handle, const char *psz_function )
  92 {
  93     return (void *)GetProcAddress( handle, (char *)psz_function );
  94 }