Piano key controls, including all the source code are interested can look quite interesting

CPianoCtrl_Demo1\PianoCtrlDemo1
................\..............\BlackKey.cpp
................\..............\Debug
................\..............\GNU License.txt
................\..............\Piano.clw
................\..............\Piano.cpp
................\..............\Piano.h
................\..............\Piano.rc
................\..............\PianoCtrl.cpp
................\..............\PianoCtrl.h
................\..............\PianoCtrlDemo.dsp
................\..............\PianoCtrlDemo.dsw
................\..............\PianoCtrlDemo.opt
................\..............\PianoCtrlDemo.plg
................\..............\PianoDlg.cpp
................\..............\PianoDlg.h
................\..............\PianoKeys.cpp
................\..............\res
................\..............\...\Piano.ico
................\..............\...\Piano.rc2
................\..............\resource.h
................\..............\StdAfx.cpp
................\..............\StdAfx.h
................\..............\WhiteKeyFull.cpp
................\..............\WhiteKeyLeft.cpp
................\..............\WhiteKeyMiddle.cpp
................\..............\WhiteKeyRight.cpp

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