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134 lines
3.9 KiB
C
134 lines
3.9 KiB
C
/* FreezeDLLMain.cpp
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This is a DLLMain suitable for frozen applications/DLLs on
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a Windows platform.
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The general problem is that many Python extension modules may define
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DLL main functions, but when statically linked together to form
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a frozen application, this DLLMain symbol exists multiple times.
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The solution is:
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* Each module checks for a frozen build, and if so, defines its DLLMain
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function as "__declspec(dllexport) DllMain%module%"
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(eg, DllMainpythoncom, or DllMainpywintypes)
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* The frozen .EXE/.DLL links against this module, which provides
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the single DllMain.
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* This DllMain attempts to locate and call the DllMain for each
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of the extension modules.
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* This code also has hooks to "simulate" DllMain when used from
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a frozen .EXE.
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At this stage, there is a static table of "possibly embedded modules".
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This should change to something better, but it will work OK for now.
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Note that this scheme does not handle dependencies in the order
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of DllMain calls - except it does call pywintypes first :-)
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As an example of how an extension module with a DllMain should be
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changed, here is a snippet from the pythoncom extension module.
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// end of example code from pythoncom's DllMain.cpp
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#ifndef BUILD_FREEZE
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#define DLLMAIN DllMain
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#define DLLMAIN_DECL
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#else
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#define DLLMAIN DllMainpythoncom
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#define DLLMAIN_DECL __declspec(dllexport)
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#endif
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extern "C" DLLMAIN_DECL
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BOOL WINAPI DLLMAIN(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
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// end of example code from pythoncom's DllMain.cpp
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***************************************************************************/
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#include "windows.h"
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static char *possibleModules[] = {
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"pywintypes",
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"pythoncom",
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"win32ui",
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NULL,
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};
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BOOL CallModuleDllMain(char *modName, DWORD dwReason);
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/*
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Called by a frozen .EXE only, so that built-in extension
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modules are initialized correctly
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*/
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void PyWinFreeze_ExeInit(void)
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{
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char **modName;
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for (modName = possibleModules;*modName;*modName++) {
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/* printf("Initialising '%s'\n", *modName); */
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CallModuleDllMain(*modName, DLL_PROCESS_ATTACH);
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}
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}
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/*
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Called by a frozen .EXE only, so that built-in extension
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modules are cleaned up
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*/
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void PyWinFreeze_ExeTerm(void)
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{
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// Must go backwards
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char **modName;
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for (modName = possibleModules+Py_ARRAY_LENGTH(possibleModules)-2;
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modName >= possibleModules;
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*modName--) {
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/* printf("Terminating '%s'\n", *modName);*/
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CallModuleDllMain(*modName, DLL_PROCESS_DETACH);
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}
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}
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BOOL WINAPI DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
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{
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BOOL ret = TRUE;
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switch (dwReason) {
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case DLL_PROCESS_ATTACH:
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{
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char **modName;
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for (modName = possibleModules;*modName;*modName++) {
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BOOL ok = CallModuleDllMain(*modName, dwReason);
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if (!ok)
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ret = FALSE;
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}
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break;
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}
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case DLL_PROCESS_DETACH:
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{
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// Must go backwards
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char **modName;
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for (modName = possibleModules+Py_ARRAY_LENGTH(possibleModules)-2;
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modName >= possibleModules;
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*modName--)
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CallModuleDllMain(*modName, DLL_PROCESS_DETACH);
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break;
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}
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}
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return ret;
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}
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BOOL CallModuleDllMain(char *modName, DWORD dwReason)
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{
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BOOL (WINAPI * pfndllmain)(HINSTANCE, DWORD, LPVOID);
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char funcName[255];
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HMODULE hmod = GetModuleHandleW(NULL);
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strcpy(funcName, "_DllMain");
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strcat(funcName, modName);
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strcat(funcName, "@12"); // stdcall convention.
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pfndllmain = (BOOL (WINAPI *)(HINSTANCE, DWORD, LPVOID))GetProcAddress(hmod, funcName);
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if (pfndllmain==NULL) {
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/* No function by that name exported - then that module does
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not appear in our frozen program - return OK
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*/
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return TRUE;
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}
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return (*pfndllmain)(hmod, dwReason, NULL);
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}
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