IWMSDataSourcePluginCallback.OnGetRootDirectories (Visual Basic .NET)

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IWMSDataSourcePluginCallback.OnGetRootDirectories (Visual Basic .NET)

The OnGetRootDirectories method is called by a data source plug-in to respond when the server calls IWMSDataSourcePlugin.GetRootDirectories.

Syntax

Parameters

hr

Int32 containing the result of the call to IWMSDataSourcePlugin.GetRootDirectories.

dwNumReturnedRoots

UInt32 containing the number of root directories returned.

dwTotalNumRoots

UInt32 containing the total number of root directories.

qwContext

UInt64 containing a value defined by the server to identify which IWMSDataSourcePlugin.GetRootDirectories request the plug-in is responding to when it calls OnGetRootDirectories. The plug-in must pass this value back unaltered.

Return Values

This method does not return a value. If the plug-in uses the IWMSEventLog object to log error information, it is recommended that it send NS_E_PLUGIN_ERROR_REPORTED (0xC00D157D) to the server in the lHr parameter. 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 object to log custom error information to the Windows Event Viewer, sending NS_E_PLUGIN_ERROR_REPORTED stops the server from also logging to the event viewer. For more information about plug-in error information, see Identifying Plug-in Errors.

Requirements

Reference: Add a reference to Microsoft.WindowsMediaServices.

Namespace: Microsoft.WindowsMediaServices.Interop.

Assembly: Microsoft.WindowsMediaServices.dll.

Library: WMSServerTypeLib.dll.

Platform: Windows Server 2003, Enterprise Edition; Windows Server 2003, Datacenter Edition; and Windows Server 2008.

See Also

• IWMSDataSourcePluginCallback Object (Visual Basic .NET)

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