MFGetAttributeUINT64 Function
Returns a UINT64 value from an attribute store, or a default value if the attribute is not present.
Syntax
UINT64 MFGetAttributeUINT64(
__in IMFAttributes *pAttributes,
__in REFGUID guidKey,
__in UINT64 unDefault
);
Parameter
pAttributes [in]
Pointer to the IMFAttributes interface of the attribute store.guidKey [in]
GUID that identifies which value to retrieve.unDefault [in]
Default value to return if the attribute store does not contain the specified attribute.
Rückgabewert
Returns a UINT64 value.
Hinweise
This helper function queries the attribute store for the UINT64 value specified by guidKey. If the value is not present, the function returns unDefault.
This function is convenient because it never returns a failure code. However, if the attribute in question does not have a meaningful default value, you should call IMFAttributes::GetUINT64 and check for MF_E_ATTRIBUTENOTFOUND.
Anforderungen
Mindestens unterstützter Client |
Windows Vista |
Mindestens unterstützter Server |
Windows Server 2008 |
Header |
Mfapi.h |