CPaintDC,CClientDC 区别
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CPaintDC是从CDC派生出来的。在构造时自动调用CWnd::BeginPaint,析构时调用CWnd::EndPaint。通常CPaintDC用来响应WM_PAINT消息。一般应用在OnPaint函数.
CClientDC也是从CDC派生出来的.构造时自动调用GetDC函数,析构时自动调用
ReleaseDC函数.一般应用于客户区窗口的绘制.
另外,
CClientDC是在对画客户区时要用到的内存设备环境
CPaintDC用于有重画消息发出时才使用的内存设备环境
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