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如何使应用程序只运行一个实例\Demo\Demo.cpp
............................\....\Demo.dsp
............................\....\Demo.dsw
............................\....\Demo.h
............................\....\Demo.plg
............................\....\Demo.rc
............................\....\DemoDlg.cpp
............................\....\DemoDlg.h
............................\....\ReadMe.txt
............................\....\res\Demo.ico
............................\....\...\Demo.rc2
............................\....\Resource.h
............................\....\StdAfx.cpp
............................\....\StdAfx.h
............................\....\res
............................\Demo
如何使应用程序只运行一个实例