IMFAttributes::GetItem Method
Retrieves the value associated with a key.
Syntax
HRESULT GetItem(
[in] REFGUID guidKey,
[in, out] PROPVARIANT *pValue
);
Parameter
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.
Rückgabewert
The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.
| Rückgabecode | Beschreibung |
|---|---|
| S_OK | The method succeeded. |
| MF_E_ATTRIBUTENOTFOUND | The specified key was not found. |
Hinweise
This interface is available on the following platforms if the Windows Media Format 11 SDK redistributable components are installed:
- Windows XP mit Service Pack 2 (SP2) und höher.
- Windows XP Media Center Edition 2005 with KB900325 (Windows XP Media Center Edition 2005) and KB925766 (Oktober 2006 Updaterollup für Windows XP Media Center Edition) installed.
Beispiele
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;
}
Anforderungen
Mindestens unterstützter Client |
Windows Vista |
Mindestens unterstützter Server |
Windows Server 2008 |
Header |
Mfobjects.h (include Mfidl.h) |
Bibliothek |
Mfuuid.lib |