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When looking for symbols in the "main" module we must search both the main

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2000-03-23  Tor Lillqvist  <tml@iki.fi>

* gmodule-win32.c (_g_module_symbol): When looking for symbols in
the "main" module we must search both the main program and all
currently loaded DLLs. Not only the main program, or even just the
DLLs loaded as gmodules.  Libglade requires this.

Thus we need to get a list of all modules in the current
process. There are two alternative APIs to do this: PSAPI and
Toolhelp. The former is only available on NT (including Win2k),
the latter on Win9x and Win2k. Check which one works, and use
that.

Code for using PSAPI and Toolhelp was borrowed from the Dr. Mingw
tool written by Jos Fonseca <em96115@fe.up.pt>. Thanks.
This commit is contained in:
Tor Lillqvist 2000-03-22 22:34:48 +00:00 committed by Tor Lillqvist
parent e0786b05e6
commit 28bd47860b
2 changed files with 141 additions and 10 deletions
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16
gmodule/ChangeLog
View File

@ -1,3 +1,19 @@
2000-03-23 Tor Lillqvist <tml@iki.fi>
* gmodule-win32.c (_g_module_symbol): When looking for symbols in
the "main" module we must search both the main program and all
currently loaded DLLs. Not only the main program, or even just the
DLLs loaded as gmodules. Libglade requires this.
Thus we need to get a list of all modules in the current
process. There are two alternative APIs to do this: PSAPI and
Toolhelp. The former is only available on NT (including Win2k),
the latter on Win9x and Win2k. Check which one works, and use
that.
Code for using PSAPI and Toolhelp was borrowed from the Dr. Mingw
tool written by José Fonseca <em96115@fe.up.pt>. Thanks.
2000-03-04 Tor Lillqvist <tml@iki.fi>
* gmodule-win32.c: Call g_win32_error_message() to get the error

129
gmodule/gmodule-win32.c
View File

@ -33,6 +33,8 @@
#include <stdio.h>
#include <windows.h>
#include <psapi.h>
#include <tlhelp32.h>
static void
set_error (void)
@ -57,33 +59,146 @@ _g_module_open (const gchar *file_name,
return handle;
}
static gint dummy;
static gpointer null_module_handle = &dummy;
static gpointer
_g_module_self (void)
{
HMODULE handle;
handle = GetModuleHandle (NULL);
if (!handle)
set_error ();
return handle;
return null_module_handle;
}
static void
_g_module_close (gpointer handle,
gboolean is_unref)
{
if (handle != null_module_handle)
if (!FreeLibrary (handle))
set_error ();
}
static gpointer
find_in_any_module_using_toolhelp (const gchar *symbol_name)
{
typedef HANDLE (WINAPI *PFNCREATETOOLHELP32SNAPSHOT)(DWORD, DWORD);
static PFNCREATETOOLHELP32SNAPSHOT pfnCreateToolhelp32Snapshot = NULL;
typedef BOOL (WINAPI *PFNMODULE32FIRST)(HANDLE, LPMODULEENTRY32);
static PFNMODULE32FIRST pfnModule32First= NULL;
typedef BOOL (WINAPI *PFNMODULE32NEXT)(HANDLE, LPMODULEENTRY32);
static PFNMODULE32NEXT pfnModule32Next = NULL;
static HMODULE kernel32;
HANDLE snapshot;
MODULEENTRY32 me32;
gpointer p;
if (!pfnCreateToolhelp32Snapshot || !pfnModule32First || !pfnModule32Next)
{
if (!kernel32)
if (!(kernel32 = GetModuleHandle ("kernel32.dll")))
return NULL;
if (!(pfnCreateToolhelp32Snapshot = (PFNCREATETOOLHELP32SNAPSHOT) GetProcAddress (kernel32, "CreateToolhelp32Snapshot"))
|| !(pfnModule32First = (PFNMODULE32FIRST) GetProcAddress (kernel32, "Module32First"))
|| !(pfnModule32Next = (PFNMODULE32NEXT) GetProcAddress (kernel32, "Module32Next")))
return NULL;
}
if ((snapshot = (*pfnCreateToolhelp32Snapshot) (TH32CS_SNAPMODULE, 0)) == (HANDLE) -1)
return NULL;
me32.dwSize = sizeof (me32);
p = NULL;
if ((*pfnModule32First) (snapshot, &me32))
{
do {
if ((p = GetProcAddress (me32.hModule, symbol_name)) != NULL)
break;
} while ((*pfnModule32Next) (snapshot, &me32));
}
CloseHandle (snapshot);
return p;
}
static gpointer
find_in_any_module_using_psapi (const gchar *symbol_name)
{
static HMODULE psapi = NULL;
typedef BOOL (WINAPI *PFNENUMPROCESSMODULES) (HANDLE, HMODULE *, DWORD, LPDWORD) ;
static PFNENUMPROCESSMODULES pfnEnumProcessModules = NULL;
HMODULE *modules;
HMODULE dummy;
gint i, size;
DWORD needed;
gpointer p;
if (!pfnEnumProcessModules)
{
if (!psapi)
if ((psapi = LoadLibrary ("psapi.dll")) == NULL)
return NULL;
if (!(pfnEnumProcessModules = (PFNENUMPROCESSMODULES) GetProcAddress (psapi, "EnumProcessModules")))
return NULL;
}
if (!(*pfnEnumProcessModules) (GetCurrentProcess (), &dummy,
sizeof (HMODULE), &needed))
return NULL;
size = needed + 10 * sizeof (HMODULE);
modules = g_malloc (size);
if (!(*pfnEnumProcessModules) (GetCurrentProcess (), modules,
size, &needed)
|| needed > size)
{
g_free (modules);
return NULL;
}
p = NULL;
for (i = 0; i < needed / sizeof (HMODULE); i++)
if ((p = GetProcAddress (modules[i], symbol_name)) != NULL)
break;
g_free (modules);
return p;
}
static gpointer
find_in_any_module (const gchar *symbol_name)
{
gpointer result;
if ((result = find_in_any_module_using_toolhelp (symbol_name)) == NULL
&& (result = find_in_any_module_using_psapi (symbol_name)) == NULL)
return NULL;
else
return result;
}
static gpointer
_g_module_symbol (gpointer handle,
const gchar *symbol_name)
{
gpointer p;
if (handle == null_module_handle)
p = find_in_any_module (symbol_name);
else
p = GetProcAddress (handle, symbol_name);
if (!p)
set_error ();