（二）一个MFC程序，消息映射，纯代码

  1.应用程序类 CWinApp   https://docs.microsoft.com/zh-cn/cpp/mfc/reference/cwinapp-class?f1url=https%3A%2F%2Fmsdn.microsoft.com%2Fquery%2Fdev15.query%3FappId%3DDev15IDEF1%26l%3DZH-CN%26k%3Dk(AFXWIN%2FCWin

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