The Windows Driver Model assumes that a hardware device can have several drivers, each of which contributes in some way to the successful management of the device. WDM accomplishes the layering of drivers by means of a stack of device objects. I discussed this concept in Chapter 2. Up until now, I’ve been talking exclusively about the function driver that manages the main functionality of a device. To round out this book, I’ll describe how you write a filter driver that resides above or below the function driver and modifies the behavior of the device in some way by filtering the I/O request packets (IRPs) that flow through it.

Chap16
......\dirs
......\filter
......\......\dirs
......\......\filter.htm
......\......\filtject
......\......\........\filtject.cpp
......\......\........\filtject.def
......\......\........\filtject.dsp
......\......\........\filtject.rc
......\......\........\ReadMe.txt
......\......\........\resource.h
......\......\........\StdAfx.cpp
......\......\........\StdAfx.h
......\......\sys
......\......\...\Driver.h
......\......\...\Driver.rc
......\......\...\DriverEntry.cpp
......\......\...\filter.dsp
......\......\...\filter.inf
......\......\...\makefile
......\......\...\objchk_wxp_x86
......\......\...\..............\i386
......\......\...\..............\....\filter.NMS
......\......\...\..............\....\filter.pdb
......\......\...\..............\....\filter.sys
......\......\...\..............\....\filtject.dll
......\......\...\RemoveLock.cpp
......\......\...\sources
......\......\...\stddcls.cpp
......\......\...\stddcls.h
......\powtrace
......\........\driver.h
......\........\driver.rc
......\........\DriverEntry.cpp
......\........\makefile
......\........\objchk_wxp_x86
......\........\..............\i386
......\........\..............\....\powtrace.NMS
......\........\..............\....\powtrace.pdb
......\........\..............\....\powtrace.sys
......\........\powtrace.dsp
......\........\powtrace.htm
......\........\powtrace.inf
......\........\sources
......\........\stddcls.cpp
......\........\stddcls.h
......\........\version.h

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