C / C++ / MFC

if(pMsg->message==WM_KEYDOWN){
  //Cancel escape and enter key
  if(pMsg->wParam==VK_RETURN || pMsg->wParam==VK_ESCAPE) return TRUE;
}	

void CMyDlg::OnCancel() {
	GetAsyncKeyState(VK_ESCAPE);
	if (!GetAsyncKeyState(VK_ESCAPE)) {
		CDialog::OnCancel();
	}
}

WNDPROC lpfnEditClassProc = NULL;

LRESULT CALLBACK LocalEdit_WndProc(HWND hwnd, UINT msg, 
                                   WPARAM wParam, LPARAM lParam)
{
   if (msg == WM_CHAR ) {
     MessageBeep(-1);
   }
   return CallWindowProc(lpfnEditClassProc, hwnd, msg, wParam, lParam);
}

BOOL CreateLocalEditClass()
{
   WNDCLASS wc;

   if ( lpfnEditClassProc == NULL ) {
      GetClassInfo(NULL, "Edit", &wc);
      lpfnEditClassProc = (WNDPROC) wc.lpfnWndProc;
      wc.lpfnWndProc = LocalEdit_WndProc;
      wc.lpszClassName   = "Edit";
      wc.hInstance = _hInstance;
      if (!RegisterClass(&wc))
         return FALSE;

      return TRUE;
   }
}

void DeleteLocalEditClass()
{
   if ( lpfnEditClassProc != NULL ) {
      UnregisterClass("Edit", _hInstance);
      lpfnEditClassProc = NULL;
   }
}