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To Disable Automatic Indexing

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[The feature associated with this page, Windows Media Format 11 SDK, is a legacy feature. It has been superseded by Source Reader and Sink Writer. Source Reader and Sink Writer have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use Source Reader and Sink Writer instead of Windows Media Format 11 SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

You may not always want an index to be generated by default when writing an ASF file. You can disable automatic indexing by using the IWMWriterFileSink3::SetAutoIndexing method.

The following example code demonstrates how to disable automatic indexing by the writer.

IWMWriterFileSink*  pBaseFileSink = NULL;
IWMWriterFileSink3* pMySink       = NULL;

BOOL    fAutoIndex;
HRESULT hr = S_OK;

// Initialize COM.
hr = CoInitialize(NULL);

// Create a writer file sink.
hr = WMCreateWriterFileSink(&pBaseFileSink);

// Retrieve an IWMWriterFileSink3 interface pointer for the new sink.
hr = pBaseFileSink->QueryInterface(IID_IWMWriterFileSink3,
                                    (void**)&pMySink);

// Release the base file sink.
pBaseFileSink->Release();
pBaseFileSink = NULL;

// Check the state of automatic indexing.
hr = pMySink->GetAutoIndexing(&fAutoIndex);

// If auto indexing is enabled, turn it off.
if(fAutoIndex)
   pMySink->SetAutoIndexing(FALSE);

// You can now write to this sink and the file will not have an index.

// Release the remaining interface.
pMySink->Release();
pMySink = NULL;

IWMWriterFileSink3::GetAutoIndexing

WMCreateWriterFileSink

Working with Indexes