Using VC to achieve, similar to zoom in and out GIS functions in the procedure can be used as reference for beginners, has designated a detailed description and sample code procedures.

Zoom
....\Debug
....\MainFrm.cpp
....\MainFrm.h
....\ReadMe.txt
....\res

....\...\Test.rc2


....\Resource.h
....\StdAfx.cpp
....\StdAfx.h
....\Test.aps
....\Test.clw
....\Test.cpp
....\Test.dsp
....\Test.dsw
....\Test.h
....\Test.ncb
....\Test.opt
....\Test.plg
....\Test.rc
....\TestDoc.cpp
....\TestDoc.h
....\TestView.cpp
....\TestView.h

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