IMFAttributes::GetStringLength Method
Retrieves the length of a string value associated with a key.
Syntax
HRESULT GetStringLength(
[in] REFGUID guidKey,
[out] UINT32 *pcchLength
);
Parameter
guidKey [in]
GUID that identifies which value to retrieve. The attribute type must be MF_ATTRIBUTE_STRING.pcchLength [out]
If the key is found and the value is a string type, this parameter receives the number of characters in the string, not including the terminating NULL character. To get the string value, call IMFAttributes::GetString.
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. |
| MF_E_INVALIDTYPE | The attribute value is not a string. |
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.
Anforderungen
Mindestens unterstützter Client |
Windows Vista |
Mindestens unterstützter Server |
Windows Server 2008 |
Header |
Mfobjects.h (include Mfidl.h) |
Bibliothek |
Mfuuid.lib |