cmediatype-isvalid.md

description	ms.assetid	title	ms.topic	ms.date	topic_type	api_name	api_type	api_location	ms.custom
The IsValid method determines whether a major type has been assigned to this object.	22d28019-f360-4b93-972c-d1dfe83938f0	CMediaType.IsValid method (Mtype.h)	reference	4/26/2023	APIRef kbSyntax	CMediaType.IsValid	COM	Strmbase.lib Strmbase.dll Strmbasd.lib Strmbasd.dll	UpdateFrequency5

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 It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation.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

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

See also

CMediaType Class