Implementing the New Win32 Driver Model for Windows 98 and Windows NT 5.0

摘要

Once Configuration Manager knows which resources to assign, it sends each device a Plug and Play IRP indicating that the device should start. Several stacked drivers may process it, so the I/O system creates a collection of IO_ STACK_LOCATION structures, one for each driver on the stack. In the previous in- stallment of this article, "Surveying the New Win32~® Driver Model for Windows 98 and Windows NT~® 5.0" (MSJ, November 1997), I described the basic architecture of the Win32 Driver Model (WDM) and showed the code you would use in DriverEntry and AddDevice functions to initialize a WDM driver. In this article, I'll finish the introduction to WDM by describing how to handle Plug and Play (PNP) and power management I/O requests. I'll also describe one technique whereby a Virtual Device Driver running in Windows~® 98 can call a WDM driver.