Testing Wdm2

The Wdm2Test Win32 console application in the Wdm2\exe subdirectory of the book software tests the Wdm2 driver. Wdm2Test is the same as Wdm1Test with only one change, apart from referencing the Wdm2 driver. Wdm2Test halts halfway through, waiting for the user to press a key. While it is waiting, it has a handle to the first Wdm2 device still open.

First, install a Wdm2 device using one of the installation INF files in the book software Wdm2\sys directory. It does not matter whether you use the free or checked build, although the checked build produces DebugPrint trace output.

Wdm2Test tests to see if a Query Remove request is rejected while there are any open handles to a Wdm2 device. Run Wdm2Test but do not press a key when it stops half way through. Now try to remove the Wdm2 device or reinstall its driver. The request should be rejected. Windows will state that the system must be restarted for the operation to complete.

Check that the Wdm2 driver can be removed or reinstalled when Wdm2Test has completed.

It is very difficult to test the other new aspects of Plug and Play support in the Wdm2 driver. First, Stop Device and Surprise Removal requests should never be issued for virtual devices that have no resources. Second, it is not possible to suddenly remove a Wdm2 device in...