1 /* GMODULE - GLIB wrapper code for dynamic module loading
2 * Copyright (C) 1998, 2000 Tim Janik
4 * Win32 GMODULE implementation
5 * Copyright (C) 1998 Tor Lillqvist
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
24 * Modified by the GLib Team and others 1997-2000. See the AUTHORS
25 * file for a list of people on the GLib Team. See the ChangeLog
26 * files for a list of changes. These files are distributed with
27 * GLib at ftp://ftp.gtk.org/pub/gtk/.
41 /* The w32api headers supplied with the mingw gcc don't have
42 * tlhelp32.h. We really only need the MODULEENTRY32 struct and the
43 * TH32CS_SNAPMODULE value, so provide them here.
46 #define MAX_MODULE_NAME32 255
58 char szModule[MAX_MODULE_NAME32 + 1];
59 char szExePath[MAX_PATH];
61 #define TH32CS_SNAPMODULE 8
68 gchar *error = g_win32_error_message (GetLastError ());
70 g_module_set_error (error);
74 /* --- functions --- */
76 _g_module_open (const gchar *file_name,
81 handle = LoadLibrary (file_name);
89 static gpointer null_module_handle = &dummy;
94 return null_module_handle;
98 _g_module_close (gpointer handle,
101 if (handle != null_module_handle)
102 if (!FreeLibrary (handle))
107 find_in_any_module_using_toolhelp (const gchar *symbol_name)
109 typedef HANDLE (WINAPI *PFNCREATETOOLHELP32SNAPSHOT)(DWORD, DWORD);
110 static PFNCREATETOOLHELP32SNAPSHOT pfnCreateToolhelp32Snapshot = NULL;
112 typedef BOOL (WINAPI *PFNMODULE32FIRST)(HANDLE, MODULEENTRY32*);
113 static PFNMODULE32FIRST pfnModule32First= NULL;
115 typedef BOOL (WINAPI *PFNMODULE32NEXT)(HANDLE, MODULEENTRY32*);
116 static PFNMODULE32NEXT pfnModule32Next = NULL;
118 static HMODULE kernel32;
125 if (!pfnCreateToolhelp32Snapshot || !pfnModule32First || !pfnModule32Next)
128 if (!(kernel32 = GetModuleHandle ("kernel32.dll")))
131 if (!(pfnCreateToolhelp32Snapshot = (PFNCREATETOOLHELP32SNAPSHOT) GetProcAddress (kernel32, "CreateToolhelp32Snapshot"))
132 || !(pfnModule32First = (PFNMODULE32FIRST) GetProcAddress (kernel32, "Module32First"))
133 || !(pfnModule32Next = (PFNMODULE32NEXT) GetProcAddress (kernel32, "Module32Next")))
137 if ((snapshot = (*pfnCreateToolhelp32Snapshot) (TH32CS_SNAPMODULE, 0)) == (HANDLE) -1)
140 me32.dwSize = sizeof (me32);
142 if ((*pfnModule32First) (snapshot, &me32))
145 if ((p = GetProcAddress (me32.hModule, symbol_name)) != NULL)
147 } while ((*pfnModule32Next) (snapshot, &me32));
150 CloseHandle (snapshot);
156 find_in_any_module_using_psapi (const gchar *symbol_name)
158 static HMODULE psapi = NULL;
160 typedef BOOL (WINAPI *PFNENUMPROCESSMODULES) (HANDLE, HMODULE *, DWORD, LPDWORD) ;
161 static PFNENUMPROCESSMODULES pfnEnumProcessModules = NULL;
170 if (!pfnEnumProcessModules)
173 if ((psapi = LoadLibrary ("psapi.dll")) == NULL)
176 if (!(pfnEnumProcessModules = (PFNENUMPROCESSMODULES) GetProcAddress (psapi, "EnumProcessModules")))
180 if (!(*pfnEnumProcessModules) (GetCurrentProcess (), &dummy,
181 sizeof (HMODULE), &needed))
184 size = needed + 10 * sizeof (HMODULE);
185 modules = g_malloc (size);
187 if (!(*pfnEnumProcessModules) (GetCurrentProcess (), modules,
196 for (i = 0; i < needed / sizeof (HMODULE); i++)
197 if ((p = GetProcAddress (modules[i], symbol_name)) != NULL)
206 find_in_any_module (const gchar *symbol_name)
210 if ((result = find_in_any_module_using_toolhelp (symbol_name)) == NULL
211 && (result = find_in_any_module_using_psapi (symbol_name)) == NULL)
218 _g_module_symbol (gpointer handle,
219 const gchar *symbol_name)
223 if (handle == null_module_handle)
225 if ((p = GetProcAddress (GetModuleHandle (NULL), symbol_name)) == NULL)
226 p = find_in_any_module (symbol_name);
229 p = GetProcAddress (handle, symbol_name);
238 _g_module_build_path (const gchar *directory,
239 const gchar *module_name)
243 k = strlen (module_name);
244 if (directory && *directory)
245 if (k > 4 && g_strcasecmp (module_name + k - 4, ".dll") == 0)
246 return g_strconcat (directory, "\\", module_name, NULL);
248 return g_strconcat (directory, "\\", module_name, ".dll", NULL);
249 else if (k > 4 && g_strcasecmp (module_name + k - 4, ".dll") == 0)
250 return g_strdup (module_name);
252 return g_strconcat (module_name, ".dll", NULL);