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13:12, EET
December 13, 2016
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Hi,
I am able to read the values from the server. am getting output like this
DataValue(value=780, statusCode=GOOD (0x00000000) “”, sourceTimestamp=12/16/16 10:34:02.1800000 GMT, sourcePicoseconds=0, serverTimestamp=12/16/16 10:34:02.1810000 GMT, serverPicoseconds=0)
My question is can we get like this “780” just the value. i am trying to implement read function in GUI, so i just need to read the value of tag.
Need your suggestion please!!
Thanks.
14:27, EET
Moderators
April 17, 2013
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Hi,
The mentioned output is a DataValue object. To get the value field, call DataValue.getValue(). You will get a Variant object and again, you can access the value field with method Variant.getValue().
15:54, EET
December 13, 2016
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Hi Tahvanainen,
I got the point what you are proposing. is there any example code available to do that. i am not sure how to access the Variant to get values.
i checked the Client documents and there is no much detail about this.
Thanks!
17:00, EET
Moderators
April 17, 2013
Offline
Hi,
Here’s an example which reads the value attribute of MyLevel node from SampleConsoleServer:
System.out.println("DataValue object=" + dv);
System.out.println("value=" + dv.getValue().getValue());
13:05, EET
March 9, 2017
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Hi Tony and Tahvanainen,
I am new to this stuffs, and not good in coding though, I have faced the same problem as you encountered did you get any solutions, I Can able to get the data values in normal way and I tried to use the variant method as Heikki mentioned and I have some error in that, I have posted my code and it has error
I tried like this also
DataValue value = client.readValue(NodeId.parseNodeId(“ns=5;s=Counter1”));
System.out.println(“DataValue object=” + value);
System.out.println(“value2=” + value.getValue().getValue());
I am trying to read the value from the counter1. Can you guys provide your information and this. it would be nice.
Thanks
13:35, EET
Moderators
April 17, 2013
Offline
Hi,
Please explain the error that you receive. The posted code is fine.
Without knowing more about the situation, I would guess that the error message is Bad_NodeIdUnknown “The node id refers to a node that does not exist in the server address space.”
This means that the OPC UA server in question does not contain the Counter1 node.
15:49, EET
March 9, 2017
Offline
Hi Heikki,
It works fine now I think I made some changes in the code so that the error message came. Thanks for your feedback.
Now I have another task which is I need to print the serverTimestamp as a separate output. I tried the same procedure i.e
DataValue dv = client.readValue(NodeId.parseNodeId(“ns=5;s=Counter1”));
System.out.println(“DataValue object=” + dv);
System.out.println(“value=” + dv.getServerTimestamp().getServerTimestamp());
or
System.out.println(“value=” + dv.getvalue().getServerTimestamp());
client.disconnect();
I would like to kwon how to get this
Thanks.
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