MFInvokeCallback Function
Invokes a callback method to complete an asynchronous operation.
Syntax
HRESULT MFInvokeCallback(
IMFAsyncResult *pAsyncResult
);
Parameter
- pAsyncResult
Pointer to the IMFAsyncResult interface. To create this object, call MFCreateAsyncResult.
Rückgabewert
The function returns an HRESULT. Possible values include, but are not limited to, those in the following table.
| Rückgabecode | Beschreibung |
|---|---|
| S_OK | The function succeeded. |
| MF_E_INVALID_WORKQUEUE | Invalid work queue. For more information, see IMFAsyncCallback::GetParameters. |
| MF_E_SHUTDOWN | The MFShutdown function was called to shut down the Media Foundation platform. |
Hinweise
If you are implementing an asynchronous method, use this function to invoke the caller's IMFAsyncCallback::Invoke method.
The callback is invoked from a Media Foundation work queue. For more information, see Writing an Asynchronous Method.
The MFShutdown function shuts down the work queue threads, so the callback is not guaranteed to be invoked after MFShutdown is called.
Anforderungen
Mindestens unterstützter Client |
Windows Vista |
Mindestens unterstützter Server |
Windows Server 2008 |
Header |
Mfapi.h |
Bibliothek |
Mfplat.lib |
DLL |
Mfplat.dll |