Show widget with PySide2 embedded in Qt5 application

[tuli]

Thanks!

After modifying the stackoverflow code to work with PySide2, it works fine for displaying a QMessageBox. For any QWidget derived item, the application crashes upon trying to draw it (so immediately), deep inside painting code.

from PySide2.QtWidgets import QApplication, QLabel, QMessageBox, QPushButton
 
all_widgets = QApplication.instance().allWidgets()
window = None
for widget in all_widgets:
    if str(widget.objectName()) == "main_window":
      window = widget
      break
 
//works
QMessageBox.information(window, 'Test', 'Hello!', QMessageBox.Ok)
 
//crash during paint
label = QLabel("<font color=red size=40>Hello World!</font>")
label.setParent(window)
label.show()

from PySide2.QtWidgets import QApplication, QLabel, QMessageBox, QPushButton

all_widgets = QApplication.instance().allWidgets()
window = None
for widget in all_widgets:
    if str(widget.objectName()) == "main_window":
      window = widget
      break

//works
QMessageBox.information(window, 'Test', 'Hello!', QMessageBox.Ok)

//crash during paint
label = QLabel("<font color=red size=40>Hello World!</font>")
label.setParent(window)
label.show()

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backtrace: https://pastebin.com/d3qTSgef


Smells a bit like a use-after-free, maybe there is an issue with having to specify that I take ownership of the widget or something ...

Thanks again