[mapguide-users] Tooltip value from object

Thu Mar 26 15:33:10 EDT 2009

Hi Dave,
  if I change this code

 Dim strTooltipValue as string=GetValueFromReader(objFeatureReader, objFeatureReader.GetPropertyType("thetooltip"), "thetooltip")

with this one

Dim strTooltipValue as string=GetValueFromReader(objFeatureReader, objFeatureReader.GetPropertyType("ID"), "ID")

where ID is a property of featuresource I haven't any error so I think that the problem is the computed property.

Matteo

I would do the following to better debug things.

You should check that the objFeatureReader returned from the SelectFeatures call is not null before starting the .ReadNext.

As well note that you don't appear to have set the filter either so you will likely get more than 1 record back from your data.

You might also try the SelectFeatures without adding the computed property, but instead specify an existing known property and include the filter.

This looks like it should work.

Dave

-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Matteo
Sent: Thursday, March 26, 2009 11:13 AM
To: mapguide-users at lists.osgeo.org
Subject: RE: [mapguide-users] Tooltip value from object

Hi Dave,
 this is my code:

Dim objQueryOptions As MgFeatureQueryOptions = New MgFeatureQueryOptions()
Dim strTooltipExpression as string= ="Concat (  'Nome Sito: '  ,  Concat (  NOME_SITO ,  Concat ( '\nCodice Sito: ' , Concat (  SITENUMBER ,  Concat (  '\nSrambling Code: ' ,  SCRAMBLING_CODE  )   )     )   )   )"
objQueryOptions.AddComputedProperty("thetooltip", strTooltipExpression )

Dim objFeatureReader As MgFeatureReader
objFeatureReader = objFeatureServ.SelectFeatures(New MgResourceIdentifier(objLayer.GetFeatureSourceId), objLayer.GetFeatureClassName, objQueryOptions)
While objFeatureReader.ReadNext()
  Dim strTooltipValue as string=GetValueFromReader(objFeatureReader, objFeatureReader.GetPropertyType("thetooltip"), "thetooltip") ' I get the error on this line of code
End While

GetValueFromReader function is a my function that return the property value. This is the function code:
 Function GetValueFromReader(ByVal objFeatureReader As MgReader, ByVal intpropertyType As Integer, ByVal strpropertyName As String) As String
        Dim isNull As Boolean = objFeatureReader.IsNull(strpropertyName)

        If intpropertyType = MgPropertyType.Boolean Then
            If isNull Then
                Return "null"
            Else
                Return objFeatureReader.GetBoolean(strpropertyName).ToString()
            End If

        ElseIf intpropertyType = MgPropertyType.Byte Then

            If isNull Then
                Return "null"
            Else
                Return objFeatureReader.GetByte(strpropertyName).ToString()
            End If

        ElseIf intpropertyType = MgPropertyType.Clob Then
            If isNull Then
                Return "null"
            Else
                Return "notNull"
            End If

        ElseIf intpropertyType = MgPropertyType.DateTime Then
            Dim dateTimeStr As String = Nothing
            If isNull Then
                Return "null"
            Else
                Dim aDateTime As MgDateTime = objFeatureReader.GetDateTime(strpropertyName)
                dateTimeStr = aDateTime.Month.ToString() + "."c + aDateTime.Day.ToString() + "."c + aDateTime.Year.ToString() + ":"c + aDateTime.Hour.ToString() + ":"c + aDateTime.Minute.ToString() + ":"c + aDateTime.Second.ToString()
                Return dateTimeStr
            End If

        ElseIf intpropertyType = MgPropertyType.Double Then
            If isNull Then
                Return "0"
            Else
                Return objFeatureReader.GetDouble(strpropertyName).ToString()
            End If

        ElseIf intpropertyType = MgPropertyType.Feature Then
            If isNull Then
                Return "null"
            Else
                Return "notNull"
            End If
        ElseIf intpropertyType = MgPropertyType.Int16 Then
            If isNull Then
                Return "0"
            Else
                Return objFeatureReader.GetInt16(strpropertyName).ToString()
            End If

        ElseIf intpropertyType = MgPropertyType.Int32 Then
            If isNull Then
                Return "0"
            Else
                Return objFeatureReader.GetInt32(strpropertyName).ToString()
            End If

        ElseIf intpropertyType = MgPropertyType.Int64 Then
            If isNull Then
                Return "0"
            Else
                Return objFeatureReader.GetInt64(strpropertyName).ToString()
            End If

        ElseIf intpropertyType = MgPropertyType.Raster Then
            If isNull Then
                Return "null"
            Else
                Return "notNull"
            End If

        ElseIf intpropertyType = MgPropertyType.Single Then
            If isNull Then
                Return "null"
            Else
                Return objFeatureReader.GetSingle(strpropertyName).ToString()
            End If

        ElseIf intpropertyType = MgPropertyType.String Then
            If isNull Then
                Return "null"
            Else
                Return objFeatureReader.GetString(strpropertyName)
            End If

        Else
            Return ""
        End If
    End Function

Regards,
Matteo

Can you show a larger block of code? It seems like something else is wrong after you add the computed property to the QueryFeatureOptions object.

Dave

-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Matteo
Sent: Thursday, March 26, 2009 6:19 AM
To: mapguide-users at lists.osgeo.org
Subject: RE: [mapguide-users] Tooltip value from object

Hi Dave,
  the Response.Write("Computed Property index: " + result.ToString()); expression return to me "1". So I think that 1 property is add but when I try to get the property values MG give me this error "OSGeo.MapGuide.MgObjectNotFoundException: The specified object was not found".

I call my property with this name "thetooltip" and the property expression is: Concat (  'Nome Sito: '  ,  Concat (  NOME_SITO ,  Concat ( '\nCodice Sito: ' , Concat (  SITENUMBER ,  Concat (  '\nSrambling Code: ' ,  SCRAMBLING_CODE  )   )     )   )   )

I can't modify the featuresource because is used from another program

Regards,
Matteo

So I'm guessing in your code you have something like:

result=mgFeatQueryOptions.AddComputedProperty(computedPropAlias, computedProp);
So what if you add a debug statement after it to do something like echo the following:

Response.Write("Computed Property index: " + result.ToString());

An alternative to trying to do this in code might be to edit the feature source and add the computed property there. Create your layer using the extended feature class and in your code you can just select this property without having to do the computed property bit, but if there is something wrong with the expression you have maybe that is causing the computed property to actually get added. I wouldn't call it tooltip by the way as that seems too much like a keyword. I would call it theToolTip or something to be safe.

Dave
-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Matteo
Sent: Wednesday, March 25, 2009 10:57 AM
To: mapguide-users at lists.osgeo.org
Subject: RE: [mapguide-users] Tooltip value from object

Hi Dave,
  now I get the tooltip expression from Layer definition and I add a computed property on MgFeatureQueryOptions. I have used "tooltip" alias. However when I try to read the tooltip property mapguide not find it on property collection.
Can you help me?
Regards,
Matteo

Can you parse the layer definition to get the expression and execute a query using the expression as the select statement with the addition of a feature id or key value?

Dave

-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Matteo
Sent: Tuesday, March 24, 2009 11:39 AM
To: mapguide-users at lists.osgeo.org
Subject: [mapguide-users] Tooltip value from object

Hi All,
  I need to get the tooltip value from a single object of a layer. In the layer definition the tooltip is an expression. I develop with MG 2.0.2 and ASP.NET
Have any ideas?
Regards,
Matteo
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