CMediaType.IsPartiallySpecified method
[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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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.]
The IsPartiallySpecified method determines if the media type is partially defined. A media type is partial if the major type, subtype, or format type is GUID_NULL.
Syntax
BOOL IsPartiallySpecified() const;
Parameters
This method has no parameters.
Return value
Returns TRUE if the media type is partially specified. Otherwise, returns FALSE.
Remarks
The IPin::Connect method can accept partial media types.
The implementation does not actually test the subtype. If there is a specified format type, the media type is not considered partial, even if the subtype is GUID_NULL.
Requirements
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