service could drive WMI management source, the integrity of the source code, can be used directly! Note that I have uploaded the source code in order to reduce file size, in addition to ClassInfo cast of the document, but can still open the file with VC directory structure!

WMISample
.........\Checked
.........\Debug
.........\DIRS
.........\README.TXT
.........\SYS
.........\...\Checked
.........\...\.......\WMISample.map
.........\...\.......\WMISample.obj
.........\...\.......\WMISample.pch
.........\...\.......\WMISample.res
.........\...\.......\WMISample.sbr
.........\...\.......\WMISampleDevice.obj
.........\...\.......\WMISampleDevice.sbr
.........\...\FUNCTION.H
.........\...\MAKEFILE
.........\...\OBJCHK
.........\...\......\I386
.........\...\......\....\wmisample.idb
.........\...\......\....\WMISample.inf
.........\...\......\....\WMISample.NMS
.........\...\......\....\wmisample.pdb
.........\...\......\....\WMISample.sys
.........\...\SOURCES
.........\...\WMISample.bmf
.........\...\WMISample.cpp
.........\...\WMISample.dsp
.........\...\WMISample.h
.........\...\WMISample.inf
.........\...\WMISample.mof
.........\...\WMISample.plg
.........\...\WMISample.rc
.........\...\WMISampleDevice.cpp
.........\...\WMISampleDevice.h
.........\...\WMIWah.h
.........\Test_WMISample
.........\..............\Checked
.........\..............\Debug
.........\..............\OpenByIntf.cpp
.........\..............\ReadMe.txt
.........\..............\RES

.........\..............\...\Test_WMISample.rc2
.........\..............\Resource.h
.........\..............\StdAfx.cpp
.........\..............\StdAfx.h
.........\..............\Test_WMISample.aps
.........\..............\Test_WMISample.clw
.........\..............\Test_WMISample.cpp
.........\..............\Test_WMISample.dsp
.........\..............\Test_WMISample.h
.........\..............\Test_WMISample.plg
.........\..............\Test_WMISample.rc
.........\..............\Test_WMISampleDlg.cpp
.........\..............\Test_WMISampleDlg.h
.........\..............\WMIEvent.cpp
.........\..............\WMIQuery.cpp
.........\WMISample.dsw
.........\WMISample.ncb
.........\WMISample.opt
.........\WMISampleDeviceInterface.h
.........\WMISampleioctl.h

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