QAxWidget not working on PyQt6

[Phil Thompson]

On 06/10/2025 07:44, Lukas Lang wrote:
> Hi,
> 
> I am running into an issue trying to use QAxWidget in PyQt6:
> 
> import sys
> from PyQt6.QAxContainer import QAxWidget
> from PyQt6.QtWidgets import QApplication, QMainWindow
> 
> class MyWindow(QMainWindow):
>     def __init__(self):
>         super().__init__()
> 
>         self.ax = QAxWidget("Shell.Explorer.2") # other ActiveX
> controls are also broken
> 
> if __name__ == "__main__":
>     app = QApplication(sys.argv)
>     window = MyWindow()
>     window.show()
>     sys.exit(app.exec())
> 
> Trying to run this in Python 3.13.7 with only PyQt6 installed, I get
> "Cannot mix incompatible Qt library (6.9.0) with this library
> (6.9.2)". Replacing PyQt6 in the imports with PyQt5 works as expected
> on the other hand (after installing PyQt5 of course). Am I doing
> something wrong, or is there a problem with the pre-built binaries?

QAxWidget does not guarantee backwards binary compatibility between Qt 
releases. These days I always build the wheels against the corresponding 
.0 version of Qt. Hopefully if you pin the version of PyQt6-Qt6 to 
v6.9.0 it should work.

Phil