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Reading and Writing a ByteString
June 21, 2016
11:20, EEST
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hcvoort
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Hello,

I want to read a value which is a struct on the real time side. If I read the datatype from within an android application it is represented as bytestring. How do I handle reading and writing the individual components of the bytestring in java?
Thanks a lot.

BR,

Carsten Voort

June 21, 2016
12:39, EEST
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Bjarne Boström
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If the DataType Attribute is a ByteString then from OPC UA’s perspective it is just a series of bytes. It is a scalar type that consists of an array of bytes that can only be Read/Write completely not in parts (similarly as a String is in programming languages a series of characters). An OPC UA ByteString will map to byte[] in Java. Therefore it can be accessed like any other java array e.g. first element

DataValue dv = (from the read call)
byte[] bs = (byte[]) dv.getValue().getValue(); //assuming it is a ByteString
byte element0 = bs[0];

Please let me know if my interpretation of your question was wrong.

– Bjarne

June 21, 2016
14:34, EEST
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hcvoort
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Hello Bjarne,

Thank you for responding. The cast indeed does the job. How about writing to this same NodeId with a bytestring?

BR,

Carsten Voort

June 21, 2016
15:18, EEST
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hcvoort
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hcvoort said
Hello Bjarne,

Thank you for responding. The cast indeed does the job. How about writing to this same NodeId with a bytestring?

BR,

Carsten Voort  

Hi Bjarne,

I already figured it out 🙂

-Carsten

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