Книга: Writing Windows WDM Device Drivers

Filter Drivers

Filter Drivers

Filter drivers let you modify the behavior of standard system drivers. A WDM filter driver is inserted into the device stack when the device stack is built. Figure 19.2 shows the different types of filter driver. This book does not cover filter drivers.

Figure 19.2 WDM filter drivers


Filter drivers can also be written to work in Windows NT 4 and NT 3.51. However, WDM device stacks are not available in these older operating systems. Instead, the IoGetDeviceObjectPointer or IoAttachDevice routines can be used to layer your device transparently above existing device objects. This book does not cover these types of filter driver, either.

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