IWMSDataSourcePluginCallback.OnOpenDirectory (Visual Basic .NET)

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

IWMSDataSourcePluginCallback.OnOpenDirectory(  hr As Int32,
  pDirectory As IWMSDirectory,
  qwContext As UInt64


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

IWMSDirectoryIWMSDirectory Object (Visual Basic .NET) that contains information about the subdirectories and media files in the directory.

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

Return Value

This method does not return a value. If the plug-in uses the IWMSEventLogIWMSEventLog Object (Visual Basic .NET) 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.


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)