Get HModule from inside a DLL

I need to load some resource from my DLL (i need to load them from the DLL code), for doing that I'm using FindResource.

To do that i need the HModule of the DLL. How to find that开发者_如何学Go?

(I do not know the name (filename) of the DLL (the user can change it))

You get it from the DllMain() entrypoint, 1st argument. Write one, store it in a global variable:

HMODULE DllHandle;

BOOL APIENTRY DllMain(HMODULE hModule, DWORD dwReason, LPVOID lpReserved) {
  if (dwReason == DLL_PROCESS_ATTACH) DllHandle = hModule;
  return TRUE;
}

There's an undocumented hack that works on any version of 32-bit and 64-bit Windows that I've seen. The HMODULE of a DLL is the same value as the module's base address:

static HMODULE GetThisDllHandle()
{
  MEMORY_BASIC_INFORMATION info;
  size_t len = VirtualQueryEx(GetCurrentProcess(), (void*)GetThisDllHandle, &info, sizeof(info));
  assert(len == sizeof(info));
  return len ? (HMODULE)info.AllocationBase : NULL;
}

The first argument to DllMain() is the HMODULE of the DLL.

Depending upon how your software is architected, you may not have access to DllMain or the code that wants the resource may not even know it's inside a DLL or exe!

The DLLMain function is given the DLL's module handle. Store it in a globally accessible variable.

Or, lookup the module based upon a function known to the local code:

// Determine the module handle by locating a function
// you know resides in that DLL or exe
HMODULE hModule;
GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |
                   GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
                   (LPCSTR)&myDLLfuncName, &hModule);

HRSRC hRscr = FindResource(hModule, ............);