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IAVIStream and IAVIFile Interfaces
The IAVIStream and IAVIFile interfaces contain the methods used by file and stream handlers. The PAVISTREAM data type is a pointer to an AVI stream object (through the IAVIStream interface) and the PAVIFILE data type is a pointer to an AVI file object (through the IAVIFile interface).
To create an object pointer in C, first allocate space for a structure that is
large enough to contain the pointer to the virtual function table and the
other data members. Create a virtual function table for the methods for your type
of stream, then set the pointer to the virtual function table to the address of
the virtual function table.
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