Bug: 'Class not registered' when not using 32-bit Python

[jamesbraza]

Please see ya-mouse/openopc#22 for a 32-bit Python vs 64-bit Python issue. For reference, I have MatrikonOPC Simulation Server installed and running.

I had hoped that openopc2 didn't require a 32-bit Python, but when trying to use the OPC Gateway Service with 64-bit Python I get the same error message:

>>> python -m openopc2 list-servers
...
OPCError: (OPCError(...), 'Dispatch: (-2147221164, \'Class not registered\', None, None)
opc_class:"Matrikon.OPC.Automation"')

When running with 32-bit Python, it now works fine:

>>> python -m openopc2 list-servers
    Available OPC DA servers
┌───┬───────────────────────────┐
│ # │ Server Name               │
├───┼───────────────────────────┤
│ 0 │ Matrikon.OPC.Simulation.1 │
└───┴───────────────────────────┘

It would be good to document this, and consider warning users of this possibility.

[renzop]

Yea true, a warning would be nice. I just recently found out that graybox has a 64 bit dll. For the wrapper. We had no time to test it but I think this might drop the 32 bit constraint.

…

On Sat, 7 Jan 2023 at 01:16, James Braza ***@***.***> wrote: Please see ya-mouse/openopc#22 <ya-mouse/openopc#22>. For reference, I have MatrikonOPC Simulation Server <https://www.matrikonopc.com/products/opc-drivers/opc-simulation-server.aspx> installed and running. I had hoped that openopc2 didn't require a 32-bit Python, but when trying to use the OPC Gateway Service with 64-bit Python, I get the same error message: >>> python -m openopc2 list-servers ... OPCError: (OPCError(...), 'Dispatch: (-2147221164, \'Class not registered\', None, None) opc_class:"Matrikon.OPC.Automation"') When running with 32-bit Python, it now works fine: >>> python -m openopc2 list-servers Available OPC DA servers ┌───┬───────────────────────────┐ │ # │ Server Name │ ├───┼───────────────────────────┤ │ 0 │ Matrikon.OPC.Simulation.1 │ └───┴───────────────────────────┘ It would be good to document this, and consider warning users of this possibility.

[danilNil]

Hey @jamesbraza ! I wonder how you managed to run openopc2 in a 32 bit environment. I would be really grateful if you take a look at this issue I got here: #54

BTW I've tried graybox 64 bit dll with no luck

[renzop]

I am working on a new release what I observed on a fresh Win10 install with latest updates:

• the gbda.dll from the repository was not possible to install -- only the 64bit dll from graybox worked (even in python32bit)

• important Python 32bit (did some experiments with python 64 bit bit i get somw weird windows errors... (under investigation)