Initializing Non-MFC DLLs
The latest version of this topic can be found at Initializing Non-MFC DLLs.
To initialize non-MFC DLLs, your DLL source code must contain a function called DllMain. The following code presents a basic skeleton showing what the definition of DllMain might look like:
BOOL APIENTRY DllMain(HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved)
{
switch( ul_reason_for_call ) {
case DLL_PROCESS_ATTACH:
...
case DLL_THREAD_ATTACH:
...
case DLL_THREAD_DETACH:
...
case DLL_PROCESS_DETACH:
...
}
return TRUE;
}
Note
The Windows SDK documentation for DllEntryPoint says that the actual name of the entry-point function must be specified on the linker command-line with the /ENTRY option. With Visual C++, you do not need to use the /ENTRY option if the name of your entry-point function is DllMain. In fact, if you do use the /ENTRY option and name your entry-point function something other than DllMain, the C run-time library will not get initialized properly.