IMFPMediaItem::GetPresentationAttribute method (mfplay.h)

项目
12/05/2018

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 It has been superseded by MediaPlayer and IMFMediaEngine.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

Queries the media item for a presentation attribute.

Syntax

HRESULT GetPresentationAttribute(
  [in]  REFGUID     guidMFAttribute,
  [out] PROPVARIANT *pvValue
);

Parameters

[in] guidMFAttribute

GUID that identifies the attribute value to query.

For a list of presentation attributes, see Presentation Descriptor Attributes.

[out] pvValue

Pointer to a PROPVARIANT that receives the value. The method fills the PROPVARIANT with a copy of the stored value. Call PropVariantClear to free the memory allocated by the method.

Return value

If this method succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Remarks

Presentation attributes describe the presentation as a whole. To get an attribute that applies to an individual stream within the presentation, call IMFPMediaItem::GetStreamAttribute.

Requirements

Requirement	Value
Minimum supported client	Windows 7 [desktop apps only]
Minimum supported server	Windows Server 2008 R2 [desktop apps only]
Target Platform	Windows
Header	mfplay.h

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