Length of Array in custom DataType

[AndreyKl4]

Hi all,

i am a bit confused in what way i can set the length of an Array when i create a custom DataType with help DataTypeDeffinitions on a Server side. When I use this line- I create a structure field that is an array but the length is not defined.

new_struct_field(field_name, ua_field[0], array=True)

When I connect to the structure, that includes mentioned above field, with help UaExpert I can select the ArraySize manually but i want to predefine it when i create a custom DataType.

Thanks in Advance!

Andrey

[oroulet]

internally the array size is infinite in ua. But maybe there is an extra node property. Where do you find the size?

[AndreasHeine]

https://reference.opcfoundation.org/v104/Core/docs/Part3/5.6.2/

opcua-asyncio/asyncua/ua/uaprotocol_auto.py

Line 3278 in 12c0e7a

class StructureField(FrozenClass):

    field = ua.StructureField()
    field.Name = <name>
    field.IsOptional = False
    field.Description = ua.LocalizedText(text="TEST")
    field.DataType = ua.NodeId(<dtype>)
    field.ValueRank = ua.ValueRank.OneOrMoreDimensions
    field.ArrayDimensions = [<arraylength>]

[oroulet]

oh yeah that one. Looks like the interface is currently a bit too high level. It was an error to define array as bool. I probably copied it from somewhere else. We could have given the array valuerank and arraydimenstions directly...

[oroulet]

maybe we can just add them as-is

[AndreyKl4]

@oroulet @AndreasHeine thank for your replies. I did what @AndreasHeine mentioned above.

field = ua.StructureField()
field.Name = "tags"
field.IsOptional = False
field.Description = ua.LocalizedText(text="TEST")
field.DataType = ua.NodeId(my_data_type)
field.ValueRank = ua.ValueRank.OneOrMoreDimensions
field.ArrayDimensions = [4]

After that i checked the behavior in UaExpert and it is differ from behavior in Spec https://reference.opcfoundation.org/v104/Core/docs/Part3/5.6.2/. In screenshot u will see that array is UInt32 Array[1] but it suppose to be UInt32 Array[4] as far as I correct understood the Spec. Also i tried to use Siome as client to monitor ArrayDimensions of DataType in Siome the Atribute "ArrayDimensions" is empty. Both screens i have already attached.

Thanks in Advance!