IOCTL's from a static library linked to KMDF driver

Hi,
Im trying to build a static library that can be used across multiple KMDF drivers. The library needs to send IOCTL's to another driver to access required functionality.
The library does not have access to the Wdf device object/objects of the KMDF drivers it is being linked to.
To send IOCTLs from the library, i thought i would use WdfIoTragetCreate/open and then use WdfIoTargetSendIoctlSynchronously. However, to create the IO target, i require a device object.
I thought i could call WdfGetDriver to get the driver object and create a dummy device object with no callbacks. However, all the examples and documentation seems to indicate that you only call WdfDeviceCreate inside EvtDeviceAdd or EvtChildListCreateDevice callback,
or from a call to WdfPdoInitAllocate.
Is it incorrect to call WdfDeviceCreate from a library which will be used way after the KMDF driver has come up ?
What options do i have to be able to send IOCTL's to other drivers from this static library?
-R___K

You need to pass in the actual device object, one of the many things that WDF does for you is cleanup things like reference counts etc, so you don't want to be using a dummy device object, since you will be entering the area of having to worry about when
to clean it up.
Since it is a static library you can use WDF calls unlike a DLL.
Don Burn Windows Filesystem and Driver Consulting Website: http://www.windrvr.com

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Message was edited by: sinfoni12345
Message was edited by: sinfoni12345

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