Hi everyone,
I found that in MouFilter_ServiceCallback the input data always contain one
packet (InputDataStart + 1 = InputDataEnd) but *InputDataConsumed always = 0
(I don't know if this parameter is used by any other driver, eg. mouclass).
Can anyone explain this?
Thanks in advance.
Liang Fu

usually the port driver has one packet to report, but there can be more if
there is high ISR latency, so do not depend on this. InputDataConsumed is
for the service callback function itself. it tells the driver which called
the function how many packets were consumed so that it can free them or
reuse them.

d

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"Liang Fu" <liang_fu_dr@hotmail.com> wrote in message
news:e9sgt7pRFHA.3988@tk2msftngp13.phx.gbl...

Doron,
Thanks for your help.
I can use InputDataStart and InputDataEnd to figure out the actual buffer
length and use it in moufiltr, but presently the input InputDataConsumed is
used to call the upper driver. That makes me a little uncomfortable. But on
the other hand I am afraid that using the actual InputDataConsumed to call
the upper driver could cause other problem. What's your suggestion?
Liang Fu

"Doron Holan [MS]" <doronh@nospam.microsoft.com> wrote in message
news:uWD$yT1RFHA.3076@TK2MSFTNGP14.phx.gbl...

what problems are you afraid of? the only condition that can occur is after
you call the upper service callback, if *InputDataConsumed != the number of
input packets that were reported. in that case, you will see the unconsumed
packets again in the next call to your service callback.

d

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"Liang Fu" <liang_fu_dr@hotmail.com> wrote in message
news:%23KtXERmSFHA.3184@TK2MSFTNGP09.phx.gbl...

Thanks Doron,
Then, should I use the calculated (from InputDataStart/End to call the upper
ServiceCallback?
Liang Fu

"Doron Holan [MS]" <doronh@nospam.microsoft.com> wrote in message
news:u37XNFnSFHA.2908@tk2msftngp13.phx.gbl...

you should use whatever values you want the system to see. if you remove
them, then don't report the packets you removed.

d

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"Liang Fu" <liang_fu_dr@hotmail.com> wrote in message
news:OFzSL8zSFHA.3548@TK2MSFTNGP10.phx.gbl...