The client uses the KSPROPERTY_PIN_CATEGORY property to retrieve the category of a pin factory.
KSP_PIN. The PinId member specifies the pin factory.
GUID that represents the category.
KSPROPERTY_PIN_CATEGORY is a read-only property. The KS filter uses this property to indicate the standard functional category of pins instantiated by the pin factory.
Stream minidrivers do not need to handle this property directly; the stream class driver handles this property using stream request blocks to query for more information where necessary.