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Called when the set of filters in the filter graph change or their connections change.
HRESULT NotifyGraphChange( );
Return Values
Returns an HRESULTvalue that depends on the implementation. HRESULTcan be one of the following standard constants, or other values not listed:
| Value | Description |
|---|---|
| E_FAIL | Failure. |
| E_POINTER | Null pointer argument. |
| E_INVALIDARG | Invalid argument. |
| E_NOTIMPL | Method isn't supported. |
| S_OK or NOERROR | Success. |
Remarks
This method is called whenever an FilterGraph::AddFilter, IFilterGraph::RemoveFilter, or IFilterGraph::ConnectDirectmethod is called or a method is called that will lead to one of these being called (such as IGraphBuilder::RenderFile).
Make sure you use Releaseon any held filters that have been removed at this point. For performance reasons, PIDs might choose not to rescan the filters until the PIDs actually need the interfaces, because there might be several separate notifications sent. However, it is important to release any cached interfaces immediately.