21.如何实现图像的百叶窗效果？\MainFrm.cpp
.............................\MainFrm.h
.............................\ReadMe.txt
.............................\..lease\Test.exe
.............................\res\Test.ico
.............................\...\Test.manifest
.............................\...\Test.rc2
.............................\...\TestDoc.ico
.............................\...\Toolbar.bmp
.............................\Resource.h
.............................\stdafx.cpp
.............................\stdafx.h
.............................\Test.cpp
.............................\Test.h
.............................\Test.ncb
.............................\Test.rc
.............................\Test.sln
.............................\Test.suo
.............................\Test.vcproj
.............................\TestDoc.cpp
.............................\TestDoc.h
.............................\TestView.cpp
.............................\TestView.h
.............................\Release
.............................\res
21.如何实现图像的百叶窗效果？