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MESessionTopologySet event
Raised after the IMFMediaSession::SetTopology method completes asynchronously. The Media Session raises this event after it resolves the topology into a full topology and queues the topology for playback.
Event values
Possible values retrieved from IMFMediaEvent::GetValue include the following.
| VARTYPE | Description |
|---|---|
| VT_EMPTY |
No event data. |
| VT_UNKNOWN |
Pointer to the IMFTopology interface of the full topology. |
Examples
The following example retrieves the IMFTopology pointer from an MESessionTopologySet event.
HRESULT GetTopologyFromEvent(IMFMediaEvent *pEvent, IMFTopology **ppTopology)
{
HRESULT hr = S_OK;
PROPVARIANT var;
PropVariantInit(&var);
hr = pEvent->GetValue(&var);
if (SUCCEEDED(hr))
{
if (var.vt != VT_UNKNOWN)
{
hr = E_UNEXPECTED;
}
}
if (SUCCEEDED(hr))
{
hr = var.punkVal->QueryInterface(__uuidof(IMFTopology), (void**)ppTopology);
}
PropVariantClear(&var);
return hr;
}
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows Vista [desktop apps only] |
| Minimum supported server |
Windows Server 2008 [desktop apps only] |
| Header |
|
See also
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