IWMSyncReader::SetStreamsSelected method (wmsdkidl.h)
[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 It has been superseded by Source Reader and Sink Writer.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.]
The SetStreamsSelected method configures the samples to be delivered from a list of streams. Each stream can be set to deliver all samples, no samples, or only cleanpoint samples.
Syntax
HRESULT SetStreamsSelected(
[in] WORD cStreamCount,
[in] WORD *pwStreamNumbers,
[in] WMT_STREAM_SELECTION *pSelections
);
Parameters
[in] cStreamCount
Count of streams listed at pwStreamNumbers.
[in] pwStreamNumbers
Pointer to an array of WORD values containing the stream numbers.
[in] pSelections
Pointer to an array of WMT_STREAM_SELECTION enumeration values. These values correspond with the stream numbers listed at pwStreamNumbers. Each value specifies the samples to deliver for the appropriate stream.
Return value
The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.
| Return code | Description |
|---|---|
|
The method succeeded. |
|
pwStreamNumbers or pSelections is NULL.
OR cStreamCount is zero. |
|
No file is loaded in the synchronous reader. |
|
The method is unable to allocate memory for an internal object. |
Remarks
You can call SetStreamsSelects at any time after a file has been loaded into the synchronous reader. You can continue making calls as needed during playback.
This method is identical to IWMReaderAdvanced::SetStreamsSelected except that, in the synchronous reader, stream selection is always manual. Also, because IWMSyncReader::GetNextSample includes a stream number output, you can select as many mutually exclusive streams as you like and receive samples for them.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only],Windows Media Format 9 Series SDK, or later versions of the SDK |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | wmsdkidl.h (include Wmsdk.h) |
| Library | Wmvcore.lib; WMStubDRM.lib (if you use DRM) |