基于USB设备的过滤器驱动程序算法分析

Arithmetic Analysis of Filter Driver Based on USB Device

在WDM(Windows Driver Model)体系中,驱动程序是分层实现的。过滤器驱动程序是一种特殊而重要的中级驱动程序,可用来对硬件产品包括一些USB设备实现性能优化。围绕着过滤器驱动程序的实质简要地介绍了WDM过滤器驱动程序的性能和层次模型。通过分析一个用以改进USB键盘功能的过滤器驱动程序的设计实例来深入阐述基于USB设备的过滤器驱动程序之开发原理和设计方法,并且给出了重点部分的源程序和代码注释。操作系统提供的USB功能驱动经文中讨论的过滤器驱动程序过滤之后,可以让USB键盘的作用发生质的改变。

In WDM（Windows Driver Model）system, drivers are achieved layer by layer. The filter driver is a kind of Special and important middle driver, which can be used to realize the function optimization of hardware product including some USB devices. Firstly,introduced the function and stratify model of WDM filter driver briefly based on the essence of filter driver. Then expounded the design principle about filter driver based on USB devices deeply by analysing an example about filter driver which was usd to improve the function of USB keyboard,and show the source program together with analysis of some important segment. After be filtered by the filter driver given, the USB function driver offered by OS can make the capabilities of USB keyboard be changed exceedingly.