1.1 如何通过HWND获得CWnd指针
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............................\....\Demo.opt
............................\....\Demo.plg
............................\....\Demo.rc
............................\....\DemoDlg.cpp
............................\....\DemoDlg.h
............................\....\DemoDoc.cpp
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............................\....\DemoView.cpp
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............................\....\MainFrm.cpp
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............................\....\resource.h
............................\....\...\Demo.ico
............................\....\...\Demo.rc2
............................\....\...\DemoDoc.ico
............................\....\StdAfx.cpp
............................\....\StdAfx.h