James Devine

Retrieve AFAnnotation Values - Visual Basic

Discussion created by James Devine on Jul 9, 2014
Latest reply on Jul 14, 2014 by Dan Fishman

Hello My Fellow PI in they eye geeks:

I am facing a surprising challenge. In an ASP.net application (coded using Visual Basic) I have a loop to output an AF Element's temperature attribute's values, timestamps and annotations.

================== Here is my code that throws no errors ========================

     Dim values As AFValues = selectedAttribute.GetValues(timeRange, 0, desiredUOM)
        Dim desiredAnno As Object

        '# Build a table of values and timestamps:
        Response.Write("
")         For Each tempValue As AFValue In values             desiredAnno = tempValue.GetAnnotation             If (desiredAnno Is Nothing) Then                 Response.Write("" & vbCrLf) '~ hard coded UOM abbreviation             Else                 Response.Write("" & vbCrLf)             End If         Next         'Response.Write("
" + tempValue.ToString + "°C" + tempValue.Timestamp.ToString + " 
" + tempValue.ToString + "°C" + tempValue.Timestamp.ToString + "" + desiredAnno.ToString + "
" & vbCrLf)

========================= End Code ============================================

I get this output using 'Object' data type for the variable 'desiredAnno':
18.63791847229°C 7/9/2014 4:41:34 PM OSIsoft.AF.Data.AFAnnotations
18.6298904418945°C 7/9/2014 4:42:04 PM OSIsoft.AF.Data.AFAnnotations
18.6219100952148°C 7/9/2014 4:42:34 PM OSIsoft.AF.Data.AFAnnotations
18.6139793395996°C 7/9/2014 4:43:04 PM OSIsoft.AF.Data.AFAnnotations
18.6061000823975°C 7/9/2014 4:43:34 PM OSIsoft.AF.Data.AFAnnotations


I want to see:
18.63791847229°C 7/9/2014 4:41:34 PM The Annotation Here
18.6298904418945°C 7/9/2014 4:42:04 PM Another Annotation Here
18.6219100952148°C 7/9/2014 4:42:34 PM The Third Annotation
18.6139793395996°C 7/9/2014 4:43:04 PM The Fourth Annotation
18.6061000823975°C 7/9/2014 4:43:34 PM The Fifth Annotation


I get a big fat error and variations of errors when I use the 'AFAnnotation' data type

I know there is a way to get the value of the annotations using PISDK, but I can't seem to get the values using AFSDK. After hours of testing variations of the code I am open to suggestions for how to retrieve the values of the annotations.

 

¡Muchas Gracias!

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