IMFAttributes::SetUnknown method

Associates an IUnknown pointer with a key.

Syntax


HRESULT SetUnknown(
  [in]  REFGUID guidKey,
  [in]  IUnknown *pUnknown
);

Parameters

guidKey [in]

GUID that identifies the value to set. If this key already exists, the method overwrites the old value.

pUnknown [in]

IUnknown pointer to be associated with this key.

Return value

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

Return codeDescription
S_OK

The method succeeded.

 

Remarks

To retrieve the IUnknown pointer, call IMFAttributes::GetUnknown.

It is not an error to call SetUnknown with pUnknown equal to NULL. However, GetUnknown will return MF_E_INVALIDTYPE.

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.

Requirements

Minimum supported client

Windows Vista [desktop apps | Windows Store apps]

Minimum supported server

Windows Server 2008 [desktop apps | Windows Store apps]

Header

Mfobjects.h (include Mfidl.h)

Library

Mfuuid.lib

See also

IMFAttributes
Attributes and Properties

 

 

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