Echelon OpenLNS - Manual (Page 1002)

OpenLNS Programmer's Reference 965
Syntax object. UpdateErrorEvent updateType
Element Description
object An object that implements the
ILcaMsgMonitorPointListener interface.
updateType A value indicating the type of monitor
point update which returned an error.
This will be set to 1.
Added to API LNS Release 3.0.
UpdateEvent
Summary Allows an object to execute a callback for message monitor
point updates. This can only be used in multi-threading
programming environments such as Visual C++. It cannot be
used in Visual Basic. To cause events to be generated in this
manner, follow these steps:
1. Create an object that implements the
ILcaMsgMonitorPointListener interface.
2. Define the object's behavior when the UpdateEvent
method is called .
3. Call the Advise method of the MsgMonitorPoint object
with the object created in step 1 as the object element.
OpenLNS will then provide event notification of update
errors for the selected monitor point using callbacks
instead of Windows messaging.
You must call the Advise method from the event handler
that is handling the update error events for the message
monitor point. For more information on this, see the
Advise method of the MsgMonitorPoint object.
For completion code messages, the InputDp, OutputDp, and
Src parameters are NULL.
Availability Local and full clients.
Syntax UpdateErrorEvent (UpdateType as Integer)
Element Description
object An object that implements the
ILcaMsgMonitorPointListener interface.
updateType A value indicating the type of message
monitor point update. This will be set to
0.
inputDp The DataPoint object containing the
message monitor point update.
The InputDp parameter's AutoRead and
AutoWrite properties are set to False.
outputDp A DataPoint object that allows a
response to be sent if the update is a