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Read ExtensionObject / byte array
January 20, 2017
14:24, EET
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MartinAnd
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Hello!

Trying to understand how and if the API can be used for the following task:

A built in OPC-server in a Siemens PLC returns an ExtensionObject when reading a certain node. This node has in turn descendants, (but also a value?). Is it possible to read this value as a byte array rather than browsing down to its components and reading these individually.

Looking at the same node from another OPC client we see a byte array!

//BR Martin

January 23, 2017
13:26, EET
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Heikki Tahvanainen
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Hello,

An ExtensionObject is a container for any Structured DataType. So, the server is sending a structure and optimally your client application should decode the value as a structure.

If you really want to just obtain the byte array representation of the structure, then you can call ExtensionObject.getObject() method.

If you have the structure type definition available as a UaNodeSet XML file, then you can use the code generator of the Java SDK. This makes using the structure type in your Java code easier.

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