Use the mouse to draw a rectangle, you can repeatedly draw a rectangle. Use the mouse callback function

rect_by_mouse\Debug\rect_by_mouse.exe
.............\.....\rect_by_mouse.ilk
.............\.....\rect_by_mouse.pdb
.............\ipch\rect_by_mouse-9ec6f4fb\rect_by_mouse-b8e823dc.ipch
.............\rect_by_mouse\Debug\CL.read.1.tlog
.............\.............\.....\CL.write.1.tlog
.............\.............\.....\link-cvtres.read.1.tlog
.............\.............\.....\link-cvtres.write.1.tlog
.............\.............\.....\link.3556-cvtres.read.1.tlog
.............\.............\.....\link.3556-cvtres.write.1.tlog
.............\.............\.....\link.3556.read.1.tlog
.............\.............\.....\link.3556.write.1.tlog
.............\.............\.....\link.read.1.tlog
.............\.............\.....\link.write.1.tlog
.............\.............\.....\mt.read.1.tlog
.............\.............\.....\mt.write.1.tlog
.............\.............\.....\rc.read.1.tlog
.............\.............\.....\rc.write.1.tlog
.............\.............\.....\rect_by_mouse.exe.embed.manifest
.............\.............\.....\rect_by_mouse.exe.embed.manifest.res
.............\.............\.....\rect_by_mouse.exe.intermediate.manifest
.............\.............\.....\rect_by_mouse.lastbuildstate
.............\.............\.....\rect_by_mouse.log
.............\.............\.....\rect_by_mouse.obj
.............\.............\.....\rect_by_mouse.pch
.............\.............\.....\rect_by_mouse_manifest.rc
.............\.............\.....\stdafx.obj
.............\.............\.....\vc100.idb
.............\.............\.....\vc100.pdb
.............\.............\ReadMe.txt
.............\.............\rect_by_mouse.cpp
.............\.............\rect_by_mouse.vcxproj
.............\.............\rect_by_mouse.vcxproj.filters
.............\.............\rect_by_mouse.vcxproj.user
.............\.............\stdafx.cpp
.............\.............\stdafx.h
.............\.............\targetver.h
.............\rect_by_mouse.sdf
.............\rect_by_mouse.sln
.............\rect_by_mouse.suo
.............\ipch\rect_by_mouse-9ec6f4fb
.............\rect_by_mouse\Debug
.............\Debug
.............\ipch
.............\rect_by_mouse
rect_by_mouse

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