Question

The reason why it should be empty is because I need to write it in C:

https://stackoverflow.com/questions/951516/what-good-ides-are-availble-for-c/951582#951582

But how to write a dll from scratch?

Answer 1

Windows DLL are written using this skeleton

#include <windows.h>

BOOL WINAPI DllMain(
  __in  HINSTANCE hinstDLL,
  __in  DWORD fdwReason,
  __in  LPVOID lpvReserved
){
   switch(fdwReason){
      case DLL_PROCESS_ATTACH:
           break;
      case DLL_PROCESS_DETACH:
           break;
      case DLL_THREAD_ATTACH:
           break;
      case DLL_THREAD_DETACH:
           break;
   }
   return 0;
}

See here on the MSDN for this and an example of it here. Here is a tutorial on creating a DLL. A more in-depth tutorial can be found here.

Hope this helps,
Best regards,
Tom.