WriteSwitchField

[tmoers]

Hi,

I defined a union type

<opc:DataType SymbolicName="PlcReadoutValue" BaseType="ua:Union" IsUnion="true">
    <opc:Fields>
        <opc:Field Name="Bool" DataType="ua:Boolean" ValueRank="Scalar" />
        <opc:Field Name="Int32" DataType="ua:Int32" ValueRank="Scalar" />
    </opc:Fields>
</opc:DataType>

And the generated code requires IEncoder to have the method WriteSwitchField which isn't
defined.

Am I doing something wrong?

Best regards,

Tom

[opcfoundation-org]

Which version of the ModelCompilier are you using?

[tmoers]

I was using an older version first and that one resulted in something similar to a regular structure, with all the fields of the union available. So then I updated to the latest tag 2.6.0:

https://github.com/OPCFoundation/UA-ModelCompiler/tree/2.6.0

The generated code looked promising with the additional switchfield. Unfortunately, it doesn't compile. Maybe I need some additional package?

[opcfoundation-org]

That version should be linking to a preview version of the SDK. Can you build the Debug version which builds the SDK from source?

[opcfoundation-org]

The DemoModel links fine and it has a Union.

UA-ModelCompiler/Tests/DemoModel/DemoModel/DemoModel.DataTypes.cs

Line 991 in 5e6a54c

SwitchField = (SampleUnionFields)decoder.ReadSwitchField(typeof(SampleUnionFields));

I would like figure out why there is an issue on your machine.

[tmoers]

I checked the DemoModel and that indeed compiles fine. The difference is that I have the following reference:

<PackageReference Include="OPCFoundation.NetStandard.Opc.Ua" Version="1.5.374.118" />

When I change this to what the demo model uses:

<PackageReference Include="OPCFoundation.NetStandard.Opc.Ua.Core" Version="1.5.377-preview.ga511586173" />
<PackageReference Include="OPCFoundation.NetStandard.Opc.Ua.Server" Version="1.5.377-preview.ga511586173" />

It also compiles. Unfortunately, reading the values (using UaExpert) now results in the following error:

Internal Error: UaGenericStructureValue::setGenericValue returned BadEncodingLimitsExceeded

[opcfoundation-org]

A lot of things to check:

1. DataTypeDefinition Attribute for the DataType Node. It should have correct Union definition;
2. Confirm your server is setting the SwitchField and ExtensionObject.TypeId correctly.

If those look fine it may be worth writing a simple client using pre-compiled classes and verifying that works.