CharFilter_Class CharFilter example of the perfect examples. In CharFilter example, we define four global variables, which does not conform to the WDM driver, which limits the IRP, can be used, we should use local variables. The examples READ_COMPLETION_INFO definition of a structure, when DeviceControl call, on the allocation of a target structure, parameter setting after the end of this structure on the address pointer on the object I. FileObject ()- gt; FsContext China.

CharFilter_Class
................\CharFilter.dsw
................\CharFilter.ncb
................\CharFilter.opt
................\CharSampleDeviceInterface.h
................\CharSampleioctl.h
................\Checked
................\Debug
................\DIRS
................\EXE
................\...\Debug
................\...\MAKEFILE
................\...\OBJCHK
................\...\......\I386
................\...\......\....\Test_CharFilter.exe
................\...\......\....\Test_CharFilter.idb
................\...\......\....\Test_CharFilter.ilk
................\...\......\....\test_charfilter.pdb
................\...\OpenByIntf.cpp
................\...\SOURCES
................\...\Test_CharFilter.cpp
................\...\Test_CharFilter.dsp
................\...\Test_CharFilter.plg
................\README.TXT
................\SYS
................\...\CharFilter.cpp
................\...\CharFilter.dsp
................\...\CharFilter.h
................\...\CharFilter.inf
................\...\CharFilter.plg
................\...\CharFilter.rc
................\...\CharFilterDevice.cpp
................\...\CharFilterDevice.h
................\...\Checked
................\...\.......\CharFilter.map
................\...\.......\CharFilter.obj
................\...\.......\CharFilter.pch
................\...\.......\CharFilter.res
................\...\.......\CharFilter.sbr
................\...\.......\CharFilterDevice.obj
................\...\.......\CharFilterDevice.sbr
................\...\FUNCTION.H
................\...\MAKEFILE
................\...\OBJCHK
................\...\......\I386
................\...\......\....\charfilter.idb
................\...\......\....\CharFilter.NMS
................\...\......\....\charfilter.pdb
................\...\......\....\CharFilter.sys
................\...\......\....\CharSample.inf
................\...\......\....\CharSample.sys
................\...\SOURCES

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