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IMFAttributes::GetItem method

Retrieves the value associated with a key.

Syntax


HRESULT GetItem(
  [in]       REFGUID guidKey,
  [in, out]  PROPVARIANT *pValue
);

Parameters

guidKey [in]

A GUID that identifies which value to retrieve.

pValue [in, out]

A pointer to a PROPVARIANT that receives the value. The method fills the PROPVARIANT with a copy of the stored value, if the value is found. Call PropVariantClear to free the memory allocated by this method. This parameter can be NULL. If this parameter is NULL, the method searches for the key and returns S_OK if the key is found, but does not copy the value.

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.

MF_E_ATTRIBUTENOTFOUND

The specified key was not found.

 

Remarks

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.

Examples

The following example copies an attribute from one attribute store to another.


HRESULT CopyAttribute(IMFAttributes *pFrom, IMFAttributes *pTo, REFGUID guidKey)
{
    PROPVARIANT val;

    HRESULT hr = pFrom->GetItem(guidKey, &val);

    if (SUCCEEDED(hr))
    {
        hr = pTo->SetItem(guidKey, val);
        PropVariantClear(&val);
    }
    else if (hr == MF_E_ATTRIBUTENOTFOUND)
    {
        hr = S_OK;
    }
    return hr;
}


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

Attributes and Properties
IMFAttributes

 

 

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