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IMFAttributes::CompareItem method

Queries whether a stored attribute value equals to a specified PROPVARIANT.


HRESULT CompareItem(
  [in]  REFGUID        guidKey,
  [out] BOOL           *pbResult


guidKey [in]

GUID that identifies which value to query.

Value [in]

PROPVARIANT that contains the value to compare.

pbResult [out]

Receives a Boolean value indicating whether the attribute matches the value given in Value. See Remarks. This parameter must not be NULL. If this parameter is NULL, an access violation occurs.

Return value

The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Return codeDescription

The method succeeded.



The method sets pbResult to FALSE for any of the following reasons:

  • No attribute is found whose key matches the one given in guidKey.

  • The attribute's PROPVARIANT type does not match the type given in Value.

  • The attribute value does not match the value given in Value.

  • The method fails.

Otherwise, the method sets pbResult to TRUE.

This interface is available on the following platforms if the Windows Media Format 11 SDK redistributable components are installed:

  • Windows XP with Service Pack 2 (SP2) and later.
  • Windows XP Media Center Edition 2005 with KB900325 (Windows XP Media Center Edition 2005) and KB925766 (October 2006 Update Rollup for Windows XP Media Center Edition) installed.


Minimum supported client

Windows Vista [desktop apps | UWP apps]

Minimum supported server

Windows Server 2008 [desktop apps | UWP apps]


Mfobjects.h (include Mfidl.h)



See also

Attributes and Properties



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