Using VC to be a background color changes. Two seconds before the black screen, t = 2s when the red box shows disappear after 1s, then the 0.5s in the black, green box appears, showing 1s

DrawTest\Debug\DrawTest.exe
........\.....\DrawTest.ilk
........\.....\DrawTest.obj
........\.....\DrawTest.pch
........\.....\DrawTest.pdb
........\.....\DrawTest.res
........\.....\DrawTestDoc.obj
........\.....\MainFrm.obj
........\.....\StdAfx.obj
........\.....\vc60.idb
........\.....\vc60.pdb
........\Debug
........\DrawTest.clw
........\DrawTest.cpp
........\DrawTest.dsp
........\DrawTest.dsw
........\DrawTest.h
........\DrawTest.ncb
........\DrawTest.opt
........\DrawTest.plg
........\DrawTest.rc
........\DrawTestDoc.cpp
........\DrawTestDoc.h
........\DrawTestView.cpp
........\DrawTestView.h
........\MainFrm.cpp
........\MainFrm.h
........\ReadMe.txt
........\res\DrawTest.ico
........\...\DrawTest.rc2
........\...\DrawTestDoc.ico
........\...\Toolbar.bmp
........\res
........\Resource.h
........\StdAfx.cpp
........\StdAfx.h
DrawTest

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