CMediaType.IsValid 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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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 IsValid method determines whether a major type has been assigned to this object.
Syntax
BOOL IsValid() const;
Parameters
This method has no parameters.
Return value
Returns TRUE if a major type has been assigned to this object. Otherwise, returns FALSE.
Remarks
By default, CMediaType objects are initialized with a major type of GUID_NULL. Call this method to determine whether the object has been correctly initialized.
Requirements
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