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Inheriting the COM Interfaces

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The filter-class factory inherits the IClassFactory interface. The filter class inherits the IFilter interface and one or more derived IPersist interfaces. These interfaces are declared in files included from the mssdk\include directory and have predefined interface identifiers (IIDs).

The filter class can inherit one or more of the IPersistFile, IPersistStorage, and IPersistStream interfaces. The content-indexing client queries the filter through its IUnknown interface to determine which of these interfaces to use when filtering content.