Get DLL path at runtime

Question

I want to get a dll\'s directory (or file) path from within its code. (not the program\'s .exe file path)

I\'ve tried a few methods I\'ve found:

Answer 1

Imho, Remy Lebau’s answer is the best, but lacks like all other answers to render the directory of the DLL. I quote the original question: “I want to get a dll's directory (or file) path from within its code. (not the program's .exe file path).”

As Remy and Jean-Marc Volle pointed out, the DLL entry function DllMain usually contained in dllmain.cpp provides the handle to the DLL. This handle is often necessary, so it will be saved in a global variable hMod. I also add variables of type std::wstring to store the fully qualified name and the parent path of the DLL.

HMODULE hMod;
std::wstring PathAndName;
std::wstring OnlyPath;
BOOL APIENTRY DllMain( HMODULE 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:
     break;
  }
  hMod = hModule;
  const int BUFSIZE = 4096;
  wchar_t buffer[BUFSIZE];
  if (::GetModuleFileNameW(hMod, buffer, BUFSIZE - 1) <= 0)
  {
    return TRUE;
  }

  PathAndName = buffer;

  size_t found = PathAndName.find_last_of(L"/\\");
  OnlyPath = PathAndName.substr(0, found);

  return TRUE;
}

These global variables can be used inside the DLL.