compatibility with python 3.11.1 and QT Designer

[igutiez]

I have developed some custom plugins for Qt designer for connecting with Siemens PLC. They are working pretty well using 3.10.x or 3.11.0 but there are something in the last 3.11.1 that is not compatible with Qt-Designer + snap7. I am sure that the problem is with snap7 because if I not import the snap7 package, the plugins appear again in Qt-Designer.
It is something related to 3.11.1 - Snap7, but I cannot find the problem.

[gijzelaerr]

i have no problem installing snap7 on python 3.11.1:

λ  python3.11 --version
Python 3.11.1
λ  python3.11 -m venv venv
λ  venv/bin/pip install python-snap7
Looking in indexes: https://artifactory.spotify.net/artifactory/api/pypi/pypi/simple/, https://artifactory.spotify.net/artifactory/api/pypi/pypi/simple/
Collecting python-snap7
  Downloading https://artifactory.spotify.net/artifactory/api/pypi/pypi/packages/packages/b6/d3/d97b2d85f31a7a6b63231e6090836914cb8bec91060a8b2b619c4e20c2d8/python_snap7-1.2-py3-none-macosx_10_9_universal2.whl (192 kB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 192.1/192.1 kB 220.9 kB/s eta 0:00:00
Installing collected packages: python-snap7
Successfully installed python-snap7-1.2
λ  venv/bin/python3 -c "import snap7"

So this is probably a problem with your setup or QT Designer. Therefore, converting this to a discussion.

[igutiez]

I have searched, but I have not found any log.
The only thing there is in the "about" the loaded plugins, and it says nothing. When it loads the plugins the logs shows that the plugins are loaded, and when it doesn't load it doesn't say anything.
I dont know it it helps, but when I have tried to make an exe, snap7 is not included well. I have to "collect_all" of snap7 using pyinstaller to make the exe works.
It happens even in previous versions. I added the collect_all to pyinstaller, and snap7 is included properly.
As I'm saying I dont know if there is any connection between both issues.

[igutiez]

I am making some test, and I think there is any problem with ctypes (byref, create_string_buffer, sizeof...) used in snap7.
So the problem is Qt-Designer with this package, so there is nothing to do for a while.
I have just added import ctypes, and the plugins are not loaded.

[gijzelaerr]

it is hard to tell without any debug logging from QT designer about what actually is going wrong.

[igutiez]

Yep. There is no log when Qt-Designer starts (or at least I don't know where to find it).
I whish it is solved in following releases of qt-desiger/python.
Thanks for your support.

[gijzelaerr]

maybe you can build QT designer yourself with debug flags and examine the logs?