C++ how to input characters in the edit box to uppercase or lowercase

如何将编辑框中输入的字符转换为大写（小写）\Demo\Demo.cpp
..........................................\....\Demo.dsp
..........................................\....\Demo.dsw
..........................................\....\Demo.h
..........................................\....\Demo.plg
..........................................\....\Demo.rc
..........................................\....\DemoDlg.cpp
..........................................\....\DemoDlg.h
..........................................\....\DemoEdit.cpp
..........................................\....\DemoEdit.h
..........................................\....\ReadMe.txt
..........................................\....\res\Demo.ico
..........................................\....\...\Demo.rc2
..........................................\....\resource.h
..........................................\....\StdAfx.cpp
..........................................\....\StdAfx.h
..........................................\....\res
..........................................\Demo
如何将编辑框中输入的字符转换为大写（小写）

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