How to retrieve BuitInType from custom DataType

[hartmut_irs]

We are storing the BuiltInType internally for each node object, in order to use it in e.g. for read or write purposes.
Actually we are using a Siemens OPC which holds customized DataTypes.

Our approach to get the BuiltInType is working for DataTypes defined in the namespace of opcfoundation (BuiltInTypes), but not for the types defined in the Siemens-namespace.

For instance there is a DataType ("STRING", ns=3, Identifier=3014) derived from String (ns=0, Identifier=12).
What we want is to get the Supertype (BuiltInType "String", Identifier=12) but the method GetBuiltInType returns Null. Probably because it is a custom type.

Code: Select all

ReadValueIdCollection coNodes = new ReadValueIdCollection();
coNodes.Add(new ReadValueId() { NodeId = gNode.NodeId, AttributeId = Attributes.DataType });
coNodes.Add(new ReadValueId() { NodeId = gNode.NodeId, AttributeId = Attributes.ArrayDimensions });
List<DataValue> coResults = gSession.Read(coNodes, 0, TimestampsToReturn.Both, new RequestSettings() { OperationTimeout = 10000 });

if (StatusCode.IsGood(coResults[0].StatusCode))
{
    gNode.Type = TypeUtils.GetBuiltInType((NodeId)coResults[0].WrappedValue.Value);
    gNode.ArrayDimensions = coResults[1].WrappedValue.ToUInt32Array();
}

Is there a possibility to get the Supertype of this customized type?
The tool UaExpert shows for that Type as References a Supertype "String" exactly what we need.
Unfortunately I couldn't find any hint or code example concerning this issue.

[Support Team]

Hello,

There is also an overload of GetBuiltInType using a ITypeTable as second argument. Please use this method for getting BuiltInType. You should use Session.Cache as typeTable.

[melieager]

thanks