loading a .ui file crashes

[hannesdelbeke]

Mark Sneddon
We use .ui files generated from Qt Designer to author (some) ui layouts. A sample of the code we would use to load that would be something like this :

q_file = QtCore.QFile(<path to .ui file>)
q_file.open(QtCore.QFile.ReadOnly)
q_loader = QtUiTools.QUiLoader()
<UI window class>.ui = q_loader.load(q_file, self)

however, the issue seems to occur specifically around having a QUiLoader object initialised - if you initialise one immediately after startup and then instantiate the QApplication instance to wrap the blender application - crash to desktop. Conversely, if you instantiate the QApplication instance to wrap the blender application, works fine, until you instantiate a QGuiLoader object - then you get crash to desktop.
You can (and I have) tested it with just those small amount of simple steps

AssetCatalog.zip

[hannesdelbeke]

i bleieve this is pyside6 related
current workaround, convert ui files to py files

pyside6-uic "input.ui" -o "output.py"