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ReadvalueList error

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28 Dec 2021 08:59 #10511 by info@software2000.it
I tried your suggestion but to no avail.

I added
ReadArgumentCk.ReadParameters.MaximumAge = 0
When I go to assign the variable xxxx = resultCheck.value
the error of "function, argument value, type or count is invalid" returns to me inexorably

I also tried to do a single node reading with this code

oClient = CREATEOBJECT ("OpcLabs.EasyOpc.UA.EasyUAClient")
MESSAGEBOX (oPCUA.ReadValue ("opc.tcp: //10.0.0.205: 48010", "nsu = urn: Exor: OPCUAServer: JMobile; ns = 2; s = Tags.Application / GVL / Data_Exchange_Scada / Put_Data_PiecesCounter")

but the same mistake always comes back to me.

In the attached screen shoots you can see how with the DEMO application I correctly read the value of the node,
I don't understand what it can be
Attachments:

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28 Dec 2021 08:24 #10510 by support
Replied by support on topic ReadvalueList error
Please try to instruct the server to read from device. Read about it here: opclabs.doc-that.com/files/onlinedocs/QuickOpc/Latest/User%2...s%20of%20OPC%20UA%20Nodes.html .

Basically, set ReadParameters.MaximumAge to zero in ReadArguments object you are passing in to the Read call.

Best regards

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27 Dec 2021 17:51 #10509 by info@software2000.it
Yes I checked with the DEMO-UA app coming with the installation of Quickopc and all it's ok with this app, I don't understand what is the problem :-(

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27 Dec 2021 17:47 #10508 by support
Replied by support on topic ReadvalueList error
It looks like that the server is actually returning a null value for that node. So everything might be OK inside the client side/component.

Have you checked with some other OPC UA client?

Regards

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27 Dec 2021 14:15 #10507 by info@software2000.it
In the Attachement yiu Can see that the object valueresultcheck count prooerty is set to 1 but the item is (none) and nthe value property of resultcheck is (none) too
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27 Dec 2021 11:53 #10506 by info@software2000.it
I tried .Value and .value but not workoing too, see the attachement, the property Succeeded is True but no oher prorperty show
????
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23 Dec 2021 19:41 - 23 Dec 2021 19:41 #10504 by support
Replied by support on topic ReadvalueList error
I understand. It really looks like that .Value does not exist in that object. But it should.

I know it's weird, but please try .value instead (small first letter). If that works, I will explain what has happened, afterwards.

Best regards
Last edit: 23 Dec 2021 19:41 by support.

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23 Dec 2021 13:36 #10502 by info@software2000.it
If I print to screen vartype(resultCheck) the value is 'O' (object) and it0s correct because reslutChe k is an Object, but if I print to the screen vartype(resultCheck.Value) it return an error , exactly Function argument value, type or count is invalid , it seem that the .Value doesn't exist

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23 Dec 2021 13:10 #10501 by support
Replied by support on topic ReadvalueList error
There is a Value property. I would expect the problem to be rather in the variable type. Have you tried declaring it as Variant?

Regards

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23 Dec 2021 12:07 #10500 by info@software2000.it
Thanks,
the language is Microsfot Visual Foxpro, the variable 'valore' is used in a statement and foxpro if not decalred assign the type as the value assigned to it, but I try to declare the variable valore as String, as number, but no change , same error as not declared.
It seem that ther's no Value property in the object I think, but I don't understand why Exeption is empty , error is empty and succeeded is true; ther's some other property Can I check?

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