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How to create schematic attribute as associated field using ArcObjects?

KevinLECOCQ

Hi,

I'm trying to automate the complete creation of a schematic template with ArcObjects SDK for Java (10.2).

I've managed to create the GDB, the schematic dataset and the schematic diagram class (template).

Then, I created a schematic element class associated with a feature class taken from the same GDB, which works.

I would like to share a field "NAME" between the feature class and the schematic element class, in order to label the nodes of a schematic diagram.

So, I tried that:

...

ISchematicElementClass nodeSchematicElementClass = schematicDataset.createSchematicElementClass("NODE", esriSchematicElementType.esriSchematicNodeType);

nodeSchematicElementClass.setSchematicDataSourceByRef(schematicDataSource);

nodeSchematicElementClass.alterAssociatedObjectClass(schematicDataSource, nodeFeatureClass.getObjectClassID());

nodeSchematicElementClass.setGeometryType(esriGeometryType.esriGeometryPoint);

nodeSchematicElementClass.setExternalQueryEvaluationMode(esriSchematicExternalQueryEvaluationMode.esriSchematicQueryBuildEvaluation);

nodeSchematicElementClass.setQueryString("SELECT * FROM NODE");

schematicDiagramClass.associateSchematicElementClass(nodeSchematicElementClass);

UID associatedFieldUID = new UID();

associatedFieldUID.setValue("{7DE3A19D-32D0-41CD-B896-37CA3AFBD88A}"); // taken from the file ...\Desktop10.2\bin\configuration\CLSID\esri.clsid.ecfg

ISchematicAttribute schematicAttribute = nodeSchematicElementClass.createSchematicAttribute("NAME", associatedFieldUID);

then I get the following ArcObjects error in the last line:

AutomationException: 0x80040a28 - Additional field can't be added : NAME in 'Esri Schematics'

I get the same error with any other field name.

Does anybody have a solution? Am I doing something wrong with my attribute field association?

I would appreciate any help! Thanks,

Kevin

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KevinLECOCQ

And OK, I will try to create a SchematicAttributeField instead of a SchematicAttributeAssociatedField.

Now, in ArcCatalog, I see my schematic dataset containing a schematic template, containing the schematic NODE and EDGE feature classes I created, so that's a good start.

KevinLECOCQ

Yes, by using an SQL query when creating the node schematic element class, I expect to generate a diagram containing every node of my feature class. When you say that the standard builder will no longer manage them, that's to say node features selection has no effect on the diagram generation? Actually, in addition to this attribute issue, I don't manage to create a schematic diagram because I don't see how to instantiate (in java) a ISchematicStandardBuilder in order to use the generateDiagram function.

Anne-Yvonne Blin

Several questions to make sure I understand:

On the node schematic feature class you want to create by code, you specified a SQL Query to get all the nodes in your NODE GIS feature class. Does this mean that you expect to generate diagrams containing all those features as schematic node features in each of your diagrams? No problem with that but, in that case, you must know that you are taking control on the node features that will be built in your diagrams (the Standard builder will not longer manage them.)
You want to create a schematic attribute which values will be retrieved from the NAME field of the NODE GIS feature class you are querying. In this case, you must create a SchematicAttributeField instead of a SchematicAttributeAssociatedField (SchematicAttributeAssociatedField is designed to be used for features that are fully controlled by the Standard builder, not those returned by query). The code below should help you creating this SchematicAttributeField;

''' Create a field SchematicAttribute on a given SchematicElementClass

''' </summary>

''' <param name="schElementClass">The SchematicElementClass where the field attribute is created</param>

''' <param name="AttributeName">The ISchematicAttributeField name</param>

''' <param name="EvalMode">The EvaluationMode for the created schematic attribute</param>

''' <param name="StorageMode">The StorageMode for the created schematic attribute</param>

''' <param name="value">The FieldNames for the created schematic attribute</param>

''' <returns>The created ESRI.ArcGIS.Schematic.ISchematicAttributeField</returns>

''' <remarks>The UID.Value is a contant GUID value for the ISchematicAttributeField type of schematic attribute</remarks>

Public Function CreateAttributeFieldForElementClass(ByVal schElementClass As ESRI.ArcGIS.Schematic.ISchematicElementClass, ByVal AttributeName As String, ByVal EvalMode As ESRI.ArcGIS.Schematic.esriSchematicAttributeEvaluationMode, ByVal StorageMode As ESRI.ArcGIS.Schematic.esriSchematicAttributeStorageMode, ByVal value() As String) As ESRI.ArcGIS.Schematic.ISchematicAttributeField

Dim schAttribute As ESRI.ArcGIS.Schematic.ISchematicAttribute = Nothing

        Try

' create an ISchematicAttribute

Dim pUid As ESRI.ArcGIS.esriSystem.UID = New ESRI.ArcGIS.esriSystem.UID()

pUid.Value = "{E1902BB0-6070-4EE2-995A-DB86FAC5EEB0}"

schAttribute = schElementClass.CreateSchematicAttribute(AttributeName, pUid)

        Catch

Return Nothing

        End Try

Dim schAttributeMngt As ESRI.ArcGIS.Schematic.ISchematicAttributeManagement = TryCast(schAttribute, ESRI.ArcGIS.Schematic.ISchematicAttributeManagement)

Try

' the StorageMode must be set before the EvaluationMode

' consistenty is checked when the EvaluationMode is set

schAttributeMngt.StorageMode = StorageMode

schAttributeMngt.EvaluationMode = EvalMode

Catch

' an error is returned if the StorageMode and EvaluationMode are not consistent

End Try

' cast SchematicAttribute into ISchematicAttributeField and set its properties

Dim schAttField As ESRI.ArcGIS.Schematic.ISchematicAttributeField = TryCast(schAttribute, ESRI.ArcGIS.Schematic.ISchematicAttributeField)

If (schAttField IsNot Nothing) Then

schAttField.FieldNames = value

End If

Return schAttField

End Function

This being said, the message you get looks strange; "Additional field can't be added : NAME in 'Esri Schematics'"... According to me, this has nothing to do with AttributeAssociatedField type vs AttributeField type. Could you have a look on the schematic feature classes created under schematic dataset? Is your new NODE schematic feature class already created? Does it already contain a NAME field? Here are the steps to verify that:

Start ArcCatalog and expand the schematic dataset in Catalog tree.

Right-click the schematic dataset in Catalog tree.

Click Show/Hide Schematic Classes.

KevinLECOCQ

Yes Anne-Yvonne, thanks for your reply.

Actually, I was inspired by this .NET sample to write my Java code.

I used the same method: after creating the ISchematicElementClass, the UID corresponding to the SchematicAttributeAssociatedField class is created, then I invoke the function createSchematicAttribute with the field name and this UID.

So, maybe it's not the right time to invoke this function. I don't see how/when to do it.

Anne-Yvonne Blin

Hi Kevin

There is a sample in ArcObjects Help for .NET that should help you: http://resources.arcgis.com/en/help/arcobjects-net/conceptualhelp/index.html#//000100000p85000000

Hopping this help

Anne-Yvonne

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