Examples for OPC client and subscriber development in Python are now on GitHub: github.com/OPCLabs/Examples-QuickOPC-Python .

Note: QuickOPC now supports Python in much better way, cleaner syntax, and public packages (pypi.org/project/opclabs-quickopc/) on Python Package Index . See What's new in QuickOPC 2023.2 for more information. And, over 270 examples are available in the User's Guide!

Thank you for update. I am glad that it works.

Still I am unclear on what caused the difference between Conn.Explorer and the Python program, but hopefully hat doe snot matter any longer.

Best regards

Hello,

I do not see you doing anything wrong. Sometimes, there are problems with callbacks (DCOM) that manifest themselves like this, but it is weird that it works from Connectivity Explorer but not from Python.

Anyway, to rule this out, can you please set one property right after creating the EasyDAClient instance? Have not tested the syntax in Python, but it should be something like this:

Best regards

Hello,
I have some additional questions:

1. Are both pictures from the same machine? That is, the Connectivity Explorer works, but the Python program doesn't?
2. Or, is the problem perhaps related just to reading, and not to browsing? Have you tried to Read in the Connectivity Explorer, and what were the results?
3. Are both pictures intended to connect to the same target server?
4. If so, why are you using IP address in your Python program (Note: it is OK to use it, as long it is the correct one). Have you tried the same as Connectivity Explorer is using, that is, the computer name "VMES", in your Python program?
5. Is your Python program running under a normal user account, e.g. a console application that you start yourself, or is it hosted in some other runtime environment, and perhaps under a different user account?

To your question: You can pass in either ProgID, or CLSID in curly brackets. Normally one would use ProgID. But CLSID has the advantage that it does not require additional lookup step (using OpcEnum service or registry browsing), and might therefore work in some more cases.

Kind regards