Hi,
This is my first driver project (novice alert).
I am writing an upper filter driver for a serial port which will be
installed dynamically as part of the associated application, which is a
serial port monitor. I have succesfully attached the driver to the device
stack and I can see the various IRPs going down the stack.
When I receive either an IRP_MJ_READ or IRP_MJ_WRITE I want to be able to
examine the data buffers to see what was written to or read from the serial
port, but I don’t seem to be able to see how to do this. The Irp->Flags say
DO_DIRECT_IO but the Irp->MdlAddress is NULL.
Any suggestions would be gratefully received.
Thanks
Alasdair
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