windows变成点滴(八)之关闭消息WM_CLOSE,WM_QUIT,WM_QUIT

MFC程序的死亡相对于初生来说要简单的多，主要是以下几步：    
  　　1.当点击关闭时发出WM_CLOSE消息。    
  　　2.程序没有设置WM_CLOSE处理程序就交给默认的DefWinowProc处理，即发出WM_DESTORY消息。    
  　　4.默认的WM_DESTORY处理方式为调用::PostQuitMessage，发出WM_QUIT。    
  　case WM_CLOSE:
    //MessageBox(NULL,"dd","d",MB_OKCANCEL);
    if (MessageBox(NULL,"你确定要关闭吗?","提示",MB_OKCANCEL) == IDOK)
    {
     SendMessage(hWnd,WM_DESTROY,0,0);
     //PostQuitMessage(0);
     //PostMessage(hWnd,WM_DESTROY,0,0);
    }else{
     return 0;
    }