if (nCode < 0)  // do not process message 
    return CallNextHookEx(hhook, nCode, wParam, lParam);   
  switch (nCode) 
  { 
  case HC_ACTION: 
	{
		if  (wParam == 0) {//by another thread 					
                CWPSTRUCT* info = (CWPSTRUCT*) lParam ;
                mess = info->message ;
		switch (mess) {
                case WM_USER + 1:
               {							
                     // do some thing here
               }
        
	}
   default: 
      break; 
  }   
  return CallNextHookEx(hhook, nCode,wParam, lParam);