'Matrikon.OPC.Automation' - Dispatch: Class not registered

[jamesbraza]

I am trying to complete the steps in https://openopc.sourceforge.net/'s minimal working program example, and have begun by using src/opc.py to scan for OPC servers:

> python -m src.opc -q
Failed to initialize an OPC Automation Class from the search list 'Matrikon.OPC.Automation' - Dispatch: Class not registered

Any ideas on how to fix this?

I am using Python 3.10.8 on Windows 10 with the below pip packages:

Pyro4==4.82
pywin32==305

[jamesbraza]

Well, per this random forum post from 2014: https://sourceforge.net/p/openopc/discussion/709251/thread/189aae61/#7bd0

I discovered having 32-bit vs 64-bit Python matters 😿. I installed 32-bit Python using pyenv-win:

> pyenv install 3.10.9-win32
> pyenv local 3.10.9-win32
> python -m venv venv
> .\venv\Scripts\activate
> python -m pip install -e . pywin32

And installing and opening MatrikonOPC Simulation Server, it works:

> python -m src.opc -q
Matrikon.OPC.Simulation.1
> python -m src.opc -r Random.Bool
Random.Bool     41.0000     Good     2023-01-04 15:03:54.042000+00:00

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