COM Helper Functions

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[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

These functions provide support for implementing the IUnknown interface in DirectShow.

Function Description
DECLARE_IUNKNOWN Declares the three methods of the base interface for a new interface.
GetInterface Retrieves an interface pointer to the requested client.
INonDelegatingUnknown Nondelegating version of the IUnknown interface.
LoadOLEAut32 Loads the Automation DLL (OleAut32.dll).

Requirements

Requirement Value
Header
Combase.h (include Streams.h)
Library
Strmbase.lib (retail builds);
Strmbasd.lib (debug builds)

See also

Utility Functions