IWMSEventNotificationPlugin.OnEvent (C#)

The server calls the OnEvent method when an event subscribed to by the plug-in occurs.

void IWMSEventNotificationPlugin.OnEvent(
  ref WMS_EVENT pEvent,
  IWMSContext pUserCtx,
  IWMSContext pPresentationCtx,
  IWMSCommandContext pCommandCtx
);

Arguments

	[in] Reference to a WMS_EVENT structure containing the event.
	[in] IWMSContextIWMSContext Object (C#) containing the User Context.
	[in] IWMSContext object containing the Presentation Context.
	[in] IWMSCommandContextIWMSCommandContext Object (C#) containing the Command Context.

Return Value

This method does not return a value. To report an error, the plug-in can throw a COMException object to the server. If the plug-in uses the IWMSEventLogIWMSEventLog Object (C#) to log error information, it is recommended that it throw NS_E_PLUGIN_ERROR_REPORTED (0xC00D157D). 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 send custom error information to the Windows Event Viewer, throwing 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.

Example

public void OnEvent(
    ref WMS_EVENT pEvent,
    IWMSContext pUserCtx,
    IWMSContext pPresentationCtx,
    IWMSCommandContext pCommandCtx)
{
    IWMSContext CmdRequest;
    int iSubEvent;

    try
    {
        pCommandCtx.GetCommandRequest(out CmdRequest);
        CmdRequest.GetLongValue(WMSDefines.WMS_COMMAND_CONTEXT_EVENT,
                                WMSDefines.WMS_COMMAND_CONTEXT_EVENT_ID,
                                out iSubEvent, 0);

        switch( pEvent.Type )
        {
            case WMS_EVENT_TYPE.WMS_EVENT_PLUGIN:
                // TODO: Handle plug-in events.
                break;
            case WMS_EVENT_TYPE.WMS_EVENT_PUBLISHING_POINT:
                // TODO: Handle publishing point events.
                break;
            case WMS_EVENT_TYPE.WMS_EVENT_SERVER:
                // TODO: Handle server events.
                break;
            case WMS_EVENT_TYPE.WMS_EVENT_LIMIT_CHANGE:
                int iOldValue;
                int iNewValue;

                CmdRequest.GetLongValue(
                        WMSDefines.WMS_COMMAND_CONTEXT_LIMIT_OLD_VALUE,
                        WMSDefines.WMS_COMMAND_CONTEXT_LIMIT_OLD_VALUE_ID,
                        out iOldValue, 0);
                CmdRequest.GetLongValue(
                        WMSDefines.WMS_COMMAND_CONTEXT_LIMIT_NEW_VALUE,
                        WMSDefines.WMS_COMMAND_CONTEXT_LIMIT_NEW_VALUE_ID,
                        out iNewValue, 0);
                if( iSubEvent == (int)WMS_LIMIT_CHANGE_EVENT_TYPE.WMS_EVENT_LIMIT_CHANGE_CONNECTED_PLAYERS )
                    // TODO: Handle connected players limit change event.
                else if( iSubEvent == (int)WMS_LIMIT_CHANGE_EVENT_TYPE.WMS_EVENT_LIMIT_CHANGE_CONNECTION_RATE )
                    // TODO: Handle connection rate limit change event.
                else
                    // TODO: Handle other limit change events.

                break;
        }
    }
    catch( Exception e )
    {
        // TODO: Handle exceptions.
    }
}

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; Windows Server 2008.

See Also

Concepts

IWMSEventNotificationPlugin Object (C#)