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  1. Forum
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  5. QuickOPC-UA in COM
  7. Reading, Writing, Subscriptions
  9. OPC UA COM C++

OPC UA COM C++

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12 Dec 2022 15:56 #11327 by support
Replied by support on topic OPC UA COM C++
Hello.

QuickOPC does the session management automatically. See the User's Guide. You can start right away with "ReadValue", this is correct.

I will provide the code you asked for, but give me some time. Also, it will be tested with 2022.2 and on supported systems. It may or may not work with older versions and on unsupported systems..

Best regards

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12 Dec 2022 15:44 #11326 by simona.magni@growermetal.com
Replied by simona.magni@growermetal.com on topic OPC UA COM C++
Hello, it is a runtime error.
I also downloaded version 2022.2 but I have a window7 and it doesn't work.
I thought it should still work.
I try to redo the work with the new version on another machine.
But am I missing a piece of code? Don't I have to open a session with the UA server first? I don't know how to do it.
Simona

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12 Dec 2022 15:31 #11325 by support
Replied by support on topic OPC UA COM C++
Hello.

Can you please provide full error information - ideally a screenshot of what you are getting. Ys this a compiler error? Or is it a runtime error?

Also, is there a reason why you have chosen such an old version (2019.2), and can you switch to the current one (2022.2)? In any case, we can only give support on this and provide code for the current version, 2022.2.

Best regards

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12 Dec 2022 15:22 #11324 by simona.magni@growermetal.com
OPC UA COM C++ was created by simona.magni@growermetal.com
I installed QuickOPC-2019.2 and tried to use the SDK libraries.
My programming tool is visual studio 6.0, and I was able to compile this code without errors to read a variable:

CoInitialize(NULL);
_EasyUAClient Client=_EasyUAClient();
COleVariant varName = ClientPtr->ReadValue( "opc.tcp://10.100.4.10:4840","nsu=http://ewon.biz/Ewontags/ ;ns=4;i=2002");

but it gives me an error. "invalid variable type"

What am I missing?
Could you send me a working code to read and write a UA server using your SDK libraries?
Thank you
Simona

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  1. Forum
  3. Discussions
  5. QuickOPC-UA in COM
  7. Reading, Writing, Subscriptions
  9. OPC UA COM C++
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