Re: KSPROPERTY_TYPE_SET cannot return data??
- From: "Max Paklin" <mpaklin@xxxxxxxxxxx>
- Date: Tue, 25 Jul 2006 13:32:04 -0700
Tom,
I've never done set-modify-return on the user mode side, which is what you
are trying to do. However it is something that obviously works and ksxbar.ax
uses that all the time.
Can you post how you define your property item in question (should be
similar to 'can route' item from xbar set), your 'set' handler from that
item and your user mode code.
If I don't see anything obviously wrong I can still ask around. The chances
are high that we can figure things out for you if you can wait a few days.
-- Max.
"Tom Udale" <-> wrote in message
news:ivudncFBu98L1yPZnZ2dnUVZ_oqdnZ2d@xxxxxxxxxxxxxx
Dear Max,
Yes, in my experience M must be = N.
Don't remember why.
Just design your data structure accordingly.
Well, I am not sure whether to be happy or sad but it did not seem to
work.
I went all the way down the Microsoft style road, passing the same
structure
for input and output and copying the input to the output in KM before
setting my output information. Still, in UM, my output structure is
completely untouched. I also adjusted the MinProperty/MinData parameters
in
the KSPROPERTY_ITEM as appropriate and that did not seem to make any
difference either.
Is there some flag I am missing on my UM call (this part I do not have
with
respect to the atixbar example, so I cannot see how they call from UM).
Maybe do I have to OR SRB_GET_DEVICE_PROPERTY and SRB_SET_DEVICE_PROPERTY
together or some such thing (I am indeed grasping at straws here). Or
perhaps some flag on the property set in general?
The very mad thing is that my SRB_GET_DEVICE_PROPERTY code is exactly the
same as my original SRB_SET_DEVICE_PROPERTY, with the M!=N sized input and
output parameters, and it works fine. Furthermore, I find it very odd
that
not only does KsProperty() succeed, but it reports that is wrote the
correct
amount of data in the BytesReturned parameter. Where exactly does it
think
it wrote it??
Best regards,
Tom
.
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