使用rundll32运行C ++ DLL - 缺少条目

Question

So I'm trying to use rundll to test and run my C++ written DLL , and i've followed the guidelines here and on other sites and the entry point looks like this:

__declspec(dllexport)  void CALLBACK entry(HWND hwnd, HINSTANCE hinst, LPSTR lpszCmdLine, int nCmdShow)
{
    //do stuff
}

But the rundll process prompts me with an error message box saying "Error in C:\\path\\to\\DLL Missing entry: entry"

Attempted execution command: "rundll32 C:\\path\\to\\DLL, entry".

Answer 1

You can double-check by running Dumpbin.exe /exports on your DLL to see the actual exported name. Which right now is not entry , as the error message tells you.

You need to prefix extern "C" to the declaration to disable C++ name mangling.

Good enough for a 64-bit executable, but that turns it into _entry@16 if this is a 32-bit DLL, still not quite good enough to keep rundll32 happy. Use Project + Add New Item, Code node, pick the "Module-Definition File (.def)" item template. And make it look like this:

EXPORTS
entry = entry