The TROEventReceiver visual component is used on the client side to poll or actively receive callback event messages from a server and initiate the execution of the events (more information about TROEventReceiver see ).
For example, consider the procedures RegisterEventReceiver and CallbackEvents in the TROBaseActiveEventChannel class.
procedure TROBaseActiveEventChannel.RegisterEventReceiver(aReceiver: IROEventReceiver); begin if (aReceiver <> nil) and (fEventReceiverList.IndexOf(aReceiver) = -1) then begin fEventReceiverList.Add(aReceiver); ... end; procedure TROBaseActiveEventChannel.CallbackEvents(aData: TStream; aThread: TThread); var i: integer; begin ... for I := 0 to fEventReceiverList.Count - 1 do (fEventReceiverList[i] as IROEventReceiver).Dispatch(aData, aThread); ... end;
- Unit: uROClientIntf.pas
- Ancestry: IROActiveEventChannel
Registers a new event receiver object aReceiver in the specified channel. This procedure is needed to further use the aReceiver as receiver for callback events.
procedure RegisterEventReceiver(aReceiver: IROEventReceiver)
- aReceiver: the event receiver that should be registered.
procedure UnregisterEventReceiver(aReceiver: IROEventReceiver)
- aReceiver: The event receiver that should be unregistered.