IWMSPacketStreamer::SelectStream
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IWMSPacketStreamer::SelectStream
The SelectStream method is called by the server to specify the streams that are sent down a data path.
Syntax
HRESULT SelectStream( );
Parameters
pCommand
[in] Pointer to an IWMSCommandContext interface containing the associated context.
pStreamSwitchDescList
[in] Pointer to an IWMSStreamSwitchDescriptionList interface containing stream IDs.
pCallback
[in] Pointer to an IWMSPacketStreamerCallback interface used to report the status of the method call.
qwContext
[in] QWORD containing a value defined by the server to identify which call to SelectStream the plug-in is responding to when it calls IWMSPacketStreamerCallback::OnSelectStream. You must pass this value back unaltered.
Return Values
If the method succeeds, the plug-in must return S_OK. To report an error, the plug-in can return any HRESULT other than S_OK. If the plug-in uses the IWMSEventLog interface to log error information directly to the Windows Event Viewer, it is recommended that it return NS_E_PLUGIN_ERROR_REPORTED. Typically, the server attempts to make plug-in error information available to the server object model, the Windows Event Viewer, and the troubleshooting list in the details pane of the Windows Media Services MMC. However, if the plug-in uses the IWMSEventLog interface to send custom error information to the Windows Event Viewer, returning NS_E_PLUGIN_ERROR_REPORTED stops the server from also logging to the event viewer. For more information about retrieving plug-in error information, see Identifying Plug-in Errors.
Remarks
If this method returns S_OK, and if it does not call SelectStream on an upstream module in which it passes in the original arguments, the IWMSPacketStreamerCallback::OnSelectStream method must be called to let the input module pass results directly to the output module.
Example Code
Requirements
Header: wmsdatapath.h.
Library: WMSServerTypeLib.dll.
Platform: Windows Server 2003, Enterprise Edition; Windows Server 2003, Datacenter Edition; Windows Server 2008.
See Also
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