stephen.m.moran

AFSDK  PIServer.Changed event.

Discussion created by stephen.m.moran on Jul 10, 2013
Latest reply on Jun 7, 2016 by Davidp809

Hi,

 

I have just been trying to use the .Changed event on the PIServer obect in the AFSDK v4, but I have some questions regarding it's utility. Specifically what I was hoping for is that I would be able to detect changes to PI Tag attributes and such, specifically those made to the Span and Zero properties of a PI tag, however this doesn't appear to be working. My approach to test this has been to modify the values using PointBuilder in PI SMT and then pressing a button in my test app that calls the following code...

 
OSIsoft.AF.PI.PIPoint testPoint = OSIsoft.AF.PI.PIPoint.FindPIPoint(testServer, "SINUSOID");
testServer.Refresh();
testPoint.LoadAttributes(PICommonPointAttributes.Tag, PICommonPointAttributes.PointID, PICommonPointAttributes.Span, PICommonPointAttributes.Zero);

 After executing this I can see the updated value etc and can retreive it by calling 

 
object value = testPoint.GetAttribute(PICommonPointAttributes.Span);

But my event handler doesn't seem to get called. All of this all works when I use it in a similar fashion with an AFDatabase object, so I guess my questions are...

 

1. Should this work/ what am I doing incorrectly?

 

2. If not what sort of changes does the change event get triggered by on the PIServer and is there anywhere I can find a comprehensive list of these relating specifically to the PIServer object (I've looked in the .chm file but it doesn't give any real details)?

 

Thanks

 

Stephen M

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