模仿QQ实现对话框自动隐藏

    1.新建基本对话框应用程序Hide，并添加OnTimer事件
    void CHideDlg::OnTimer(UNIT nIDEvent)
    {
        switch(nIDEvent)
        {
            case 1:
               {
                CRect rc;   
                CRect rect;
                GetWindowRect(&rect);                  //获取窗体位置
                rc.CopyRect(&rect);                         //拷贝矩形对象
                CPoint pOint;
                GetCursorPos(&pOint);                       //获得鼠标指针位置
                if(rect.top < 0 && PtInRect(rect,pOint)) //如果鼠标在窗体上
                {
                    rect.top = 0;
                    MoveWindow(rect.left,rect.top,rc.Width(),rc.Height());  //显示窗体
                   
                }   //如果鼠标离开窗体，并且窗体上边连接屏幕上边
                else if(rect.top > -3 && rect.top < 3 && !PtInRect(rect,pOint))
                {
                    rect.top = 3-rect.Height();
                    MoveWindow(rect.left,rect.top,rc.Width(),rc.Height());  //隐藏窗体
                }
            }
            break;

            case 2:
            {
            }
            break;
    }
    }
    2.启动计时器，在OnInitDialog()函数中添加SetTimer(1,200,NULL)
    BOOL CHideDlg::OnInitDialog()
    {
        SetTimer(1,100,NULL);
        SetTimer(2,2000,NULL);//可以设置多个，但应与OnTimer中的分别对应
        return TRUE; 
      // return TRUE  unless you set the focus to a control }