获取系统环境变量\carl.asp
................\carl.txt
................\Debug\StdAfx.obj
................\.....\StdAfx.sbr
................\.....\test11.exe
................\.....\test11.obj
................\.....\test11.pdb
................\.....\test11.sbr
................\.....\vc60.pdb
................\ReadMe.txt
................\StdAfx.cpp
................\StdAfx.h
................\test11.cpp
................\test11.dsp
................\test11.dsw
................\test11.ncb
................\test11.opt
................\test11.plg
................\Debug
获取系统环境变量