Multidimensional Arrays are flattened when they are read from server

[jchirantan]

Hi @kevinherron,
I can see that when we are reading multidimensional arrays like 2D or 3D arrays from OPC UA server, they are by default flattened and converted to 1D array.

Is it the expected behavior from milo SDK? If yes then why is it so?

Also, can we get actual array by any means?

[kevinherron]

If you're talking about receiving a Matrix value then call Matrix::nestedArrayValue to get the nested/un-flattened representation.

[jchirantan]

Thanks @kevinherron, this method solved our issue. Thanks for your help

[jchirantan]

Hi @kevinherron,
I was just curious that what is the reason of adding this Matrix datatype and flattened array?
How can this help the end user?

[kevinherron]

The OPC UA wire format uses a flattened array, so it's a natural fit.

The container type helps with Java's type erasure and reflection issues, makes the implementation of serialization implementations easier, makes certain code generation scenarios possible (e.g. base class has a Foo[][] member, subclass has a FooEx[][] member), and probably some other things I'm not remembering.

The OPC Foundation .NET stack uses a Matrix container as well.