Qt Support

[NickatLCB]

Hello. I am attempting to write a UI in Qt for a custom application. I have seen examples of Qt5 being used, but not Qt6.

I am having an odd error that I have narrowed down to the following:

As you can see, i am successfully importing Qt6 through PySide6, but initializing the App seems to crash Cadwork. When i run this code from my desktop I have no issues launching the GUI, so it only happens from the shell.

Do i need to avoid this method altogether, or is there a work around? I'm a bit confused what the error is.

Thanks!

[Brunner246]

Hi,

In cadwork 3d versions <2026 you have to use Qt5.
Versions >= 2026 uses Qt6.

We recommend using PyQt.

[NickatLCB]

i had a feeling. thank you for your quick response!

[usai-sylvain]

When running a PyQt plugin in cadwork 2026 I get the following error at plugin start :

QtFatal: Cannot mix incompatible Qt library (6.8.2) with this library (6.8.3)

I found where the two different QT6Core.dll are :

"C:\Program Files\cadwork.dir\EXE_2026\Pclib.x64\python314\site-packages\PyQt6\Qt6\bin\Qt6Core.dll" uses version 6.8.2
"C:\Program Files\cadwork.dir\EXE_2026\Pclib.x64\Qt6Core.dll" uses version 6.8.3

Is that coming from me or from the cadwork install ?

[Brunner246]

What Code are you running that raises this error ?

Those Qt Versions should be compatible.

https://wiki.qt.io/Qt-Version-Compatibility#:~:text=Major%20releases%20may%20break%20backwards,forwards%20binary%20and%20source%20compatible.

[usai-sylvain]

Thanks Michi, I can't pin it on this project. I'll come back to you when I find it out.