WM_POWERBROADCAST

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{

   int wmId, wmEvent;

   PAINTSTRUCT ps;

   HDC hdc;

   TCHAR szHello[MAX_LOADSTRING];

   LoadString(hInst, IDS_HELLO, szHello, MAX_LOADSTRING);

   switch (message) 

   {

      case  WM_POWERBROADCAST:

         {

            MessageBox(0,"","",0);

         }

         break;

      default:

         return DefWindowProc(hWnd, message, wParam, lParam);
   }
   return 0;
}