Re: Why can't my usbcamd driver work well for MSN messenger?

Tech-Archive recommends: Repair Windows Errors & Optimize Windows Performance

From: Jackal Huang (huangjj_at_hotmail.com)
Date: 01/20/05 

Date: Thu, 20 Jan 2005 19:33:34 +0800

"Max Paklin" <mpaklin@hotmail.com> ...
> StreamClassRegisterFilterWithNoKSP creates a cache entry for the filter in
> question in registry so that IFilterMapper(2) can get access to it.
> To speed up graph building process the graph builder relies on the filter
> cache information under certain circumstances. If that information is
> missing it can't proceed.
>
> GraphEdit doesn't need that data as the user is supposed to build graph
> manually so while your driver can be mostly working under almost all apps,
> some apps can still fail to work with it simply because you either don't
> call StreamClassRegisterFilterWithNoKSP or call it with wrong params.
>
> MSN Messenger as well as some video editing apps as well as Media Center
> rely on device to create a cache for its filters.
>
> -- Max.

Does each stream class minidriver needs to call this function?
testcap sample code has comment for calling this function with
KSCATEGORY_CAPTURE.
It said "This should be done automatically by MSKsSrv.sys when that
component comes on line"

I also try to call this function in my usbcamd minidriver. It returns
success status.
However, the result is same. Wizard told me it cannot function the device
properly.
When I unplug the device, the driver is not unload automatically.

Jackal Huang

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