Dll injection failed

Question

I'm trying to work a dll injection, I've tryed 100 of things but none of them works, I'm now on a windows 7 32 bits (to avoid 32/64 conflict). I've used two famous dll injector found on the web (AutoInject and Extreme injector V2) and a handmade one. I'm trying to mesagebox in notepad (can't be more simple right?) I sould also add that my windows run under Vmware. here My main for my dll (build with Code-Block)

#if BUILD_DLL
#define DLLIMPORT __declspec (dllexport)
#else /* Not BUILDING_DLL */
#define DLLIMPORT __declspec (dllimport)
#endif /* Not BUILDING_DLL */

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>

BOOL APIENTRY DllMain (HINSTANCE hInst, DWORD reason, LPVOID reserved)
{
  switch (reason)
    {
     case DLL_PROCESS_ATTACH:
       MessageBox (0, "Hello from injected DLL!\n", "Hi", MB_ICONINFORMATION);
       break;
     case DLL_PROCESS_DETACH:
       break;
     case DLL_THREAD_ATTACH:
       break;
     case DLL_THREAD_DETACH:
       break;
    }
   return TRUE;
 }

I don't know what to try now

Answer 1

I found the solution to my problem, If anyone have the same problem: Just use Visual Sudio instead of code block

Answer 2

According to Howto call MessageBox in dllmain you cannot call MessageBox inside DllMain (it's severely restricted in what you can do). tenfour suggests using something like OutputDebugString.