)
{
    
     CDC* pDC = GetWindowDC();
     CDC* pMemDC=new CDC;
     CBitmap *pBitmap1=new CBitmap; 
     CBitmap *pBitmap2=new CBitmap;
     CBitmap *pOldBitmap;
     CRect rtWnd, rtButtons, rtTitle;
     //创建一个内存设备环境
     pMemDC->CreateCompatibleDC(pDC);
     if(!pDC) return;
     GetWindowRect(&rtWnd);
     //取得标题栏的矩形
     rtTitle.left = GetSystemMetrics(SM_CXFRAME);
     rtTitle.top = GetSystemMetrics(SM_CYFRAME);
     rtTitle.right = rtWnd.right - rtWnd.left - GetSystemMetrics(SM_CXFRAME);
     rtTitle.bottom = rtTitle.top + GetSystemMetrics(SM_CYSIZE);
     //计算最小化按钮的位置，位图大小为15X15
     rtButtons.top=rtTitle.top+1;
     rtButtons.bottom=rtButtons.top+15;
     rtButtons.right = rtTitle.right-20;
     rtButtons.left = rtButtons.right-15;

     m_rtButtMin = rtButtons;
     pBitmap1->LoadBitmap(IDB_BITMAP1); //调入正常状态按钮的位图
     pBitmap2->LoadBitmap(IDB_BITMAP2);  //调入按钮按下状态的位图
     m_rtButtMin.OffsetRect(rtWnd.TopLeft());//记录最小化按钮的位置
     //将按钮位图调入内存设备环境中，m_BMPPressed为TRUE
//调入正常状态按钮的位图
     pOldBitmap=pMemDC->SelectObject(m_BMPPressed ? pBitmap1: pBitmap2);
     //将按钮位图复制到实际的内存设备环境中
     pDC->BitBlt(rtButtons.left, rtButtons.top, rtButtons.Width(),
           rtButtons.Height(), pMemDC, 0, 0, SRCCOPY);
     pMemDC->SelectObject(pOldBitmap);//恢复原来的内存设备环境
 //释放资源
     ReleaseDC(pMemDC);
     ReleaseDC(pDC);
     delete pMemDC;
     delete pBitmap1;
     delete pBitmap2;
     }
⑷ 对应鼠标左键的WM_NCLBUTTONDOWN消息处理函数
void CMinButtonDlg::OnNcLButtonDown(UINT nHitTest, CPoint point)
{
     CDialog::OnNcLButtonDown(nHitTest, point);
     //检测是否在最小化按钮区域内按下按钮
     if (m_rtButtMin.PtInRect(point))
     {
           m_BMPPressed=FALSE;//绘制按钮按下时的状态
           DrawButton(); //绘制最小化按钮
           m_BMPPressed=TRUE;//绘制按钮的正常状态
           SendMessage(WM_SYSCOMMAND, SC_MINIMIZE, MAKELPARAM(point.x, point.y));//发送最小化消息
     }
     }
⑸ //在最小化按钮区域实现提示文本
BOOL CToolTips::AddToolTip( UINT nID, LPRECT lpRect, LPCTSTR lpszText  )
{
     TOOLINFO Tips;
     memset(&Tips, 0, sizeof(TOOLINFO));
     Tips.cbSize = sizeof(TOOLINFO);
     Tips.hwnd = GetOwner()->GetSafeHwnd();
     Tips.uFlags = TTF_SUBCLASS;
     Tips.uId = nID;
     memcpy(&Tips.rect, lpRect, sizeof(RECT));
     Tips.lpszText = (LPSTR)lpszText
     return (BOOL)SendMessage(TTM_ADDTOOL, 0, (LPARAM)&Tips);
}
⑹ 在对话框初始化函数OnInitDialog()中添下列代码：
m_ToolTip.Create(this,TTS_ALWAYSTIP);//创建工具提示控件，TTS_ALWAYSTIP表示，//不论控件所属窗体是否活动，提示条始终有效
     GetMinButRect();
     ScreenToClient(&m_ButtMinTips);//屏幕坐标转换为窗体坐标
     m_ToolTip.AddToolTip(1,&m_ButtMinTips,"最小化");
4      结束语
  实例程序的测试环境为Windows 98、PⅡ350，效果良好。

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