Echelon OpenLNS - Manual (Page 1003)

OpenLNS Programmer's Reference 966
request/response message.
The OutputDp parameter's AutoWrite
property is set to True; therefore, it will
be sent as a response when you write to
this DataPoint object.
srcAddr The SourceAddress object indicating the
source device of the message monitor
point update.
Added to API LNS Release 3.0.
ILcaNvMonitorPointListener
The ILcaNvMonitorPointListener interface can be added to a COM object created in a
multi-threaded programming environment such as Visual C++. You must then call the
Advise method of the NvMonitorPoint object with the object that implements this interface
as an argument. This will allow the object to receive updates from that network variable
monitor point directly, rather than through the Object Server.
The following table summarizes the ILcaNvMonitorPointListener interface .
Description Allows a COM object implementing this interface to directly
receive updates from a network variable monitor point.
Availability Local and full clients.
Added to API LNS Release 3.0.
Methods • UpdateErrorEvent
• UpdateEvent
Methods
The ILcaNvMonitorPointListener object contains the following methods :
• UpdateErrorEvent
• UpdateEvent
UpdateErrorEvent
Summary Allows an object to execute a callback for network variable
monitor point and network variable update errors. This can
only be used in multi-threading programming environments
such as Visual C++. It cannot be used in Visual Basic . To
create an object to receive UpdateErrorEvent updates, follow
these steps:
1. Create an object that implements the
ILcaNvMonitorPointListener interface.
2. Define the object's behavior when the UpdateErrorEvent
method is called.
3. Call the Advise method of the NvMonitorPoint 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