Not able to call method with complex datatype argument

[jchirantan]

Hi @kevinherron ,
Creating this discussion as you asked for in #1593
Following are the images from UAExpert

Vector Method Browse:

Vector Datatype browse:

Method Call UI

[kevinherron]

That's not the Vector DataType Node, it's the description from the datatype dictionary - it would be underneath BaseDataType -> Structure -> ... somewhere. Not sure it matters though - pretty sure the UaCPP demo server has DataTypeDefinition attributes, so Milo should be learning about the datatypes and codecs when it connects.

What code are you using when you try to create a Vector and call the method?

[jchirantan]

Oh! Do you know this kind of method in Prosys? Or is there any other server where I can test this?

[jchirantan]

Also, in case there is DataTypeDefinition available, can we build something like UAExpert UI? Where we can fetch the arguments required and ask user for exact input?

[kevinherron]

Just get a newer version of UaCPP demo server. It's a free download from Unified Automation.

And yes, you can build something like that UI. The information is available - building the UI is up to you as the application developer.

[jchirantan]

Can you share code snippet which fetches the structure because code shared above is for building the structure

[kevinherron]

All of the information in in the DataType and DataTypeDefinition (assuming the server supports DataTypeDefinition):

DataTypeTree dataTypeTree = client.getDataTypeTree();
DataType dataType = dataTypeTree.getDataType(dataTypeId);
DataTypeDefinition definition = dataType.getDataTypeDefinition();

The definition tells you about all the fields it has:

• https://github.com/eclipse-milo/milo/blob/main/opc-ua-stack/stack-core/src/main/java/org/eclipse/milo/opcua/stack/core/types/structured/StructureDefinition.java
• https://github.com/eclipse-milo/milo/blob/main/opc-ua-stack/stack-core/src/main/java/org/eclipse/milo/opcua/stack/core/types/structured/EnumDefinition.java