Windows file dialog causes errors after using QFileIconProvider
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I encountered a strange problem when calling a native file dialog after extracting the icon of a file. The problem only occurs in MS Windows 10 but not in Linux. It appears with Qt5 as well as Qt6 and also with PyQt and PySide binders.
The error message contains "Windows fatal exception: code 0x8001010e".
These fatal exceptions seem to appear in another thread because the execution of the python script is not aborted. Calling the native file dialog with tkinter causes the same problems, and using non-native file dialogs does not cause errors.After searching, the most similar case I encountered was this.
To reproduce the errors and workarounds, I created a narrowed-down example script that can be executed normally with
python filedialog_problem.py.contents of
filedialog_problem.pywith further details:"""executed in MS Windows 10 with python 3.11.3""" import faulthandler faulthandler.enable() """the problem occurs with all Qt bindings and Qt versions""" # from PySide2 import QtCore, QtGui, QtWidgets # from PyQt5 import QtCore, QtGui, QtWidgets # e.g. Qt 5.15.9 from PySide6 import QtCore, QtGui, QtWidgets # e.g. Qt 6.5.0 # from PyQt6 import QtCore, QtGui, QtWidgets def filedialog1(native=True): options = QtWidgets.QFileDialog.Option(0) if not native: options = QtWidgets.QFileDialog.Option.DontUseNativeDialog filename = QtWidgets.QFileDialog.getSaveFileName(None, 'asdf', r'C:\temp', "*.*", options=options) def filedialog2(): from tkinter import filedialog filepath = filedialog.askopenfilename() app = QtWidgets.QApplication([]) """if one of the next two lines is uncommented, there are no errors""" # filedialog1() # filedialog2() """opening a non-native dialog before does not prevent the errors""" # filedialog1(False) iconprovider = QtWidgets.QFileIconProvider() icon = iconprovider.icon(QtCore.QFileInfo()) """when using the following two icons instead of the previously defined one, then there are also no errors""" # icon = QtGui.QIcon(r'C:\temp\some_existing_image.png') # icon = iconprovider.icon(iconprovider.IconType.Trashcan) pm = icon.pixmap(256, 256) pm.save(r'C:\temp\extracted_icon.png') # this also works """when calling the native dialog, the errors occur""" filedialog1() # filedialog2() """but when calling the non-native dialog, there are no errors""" # filedialog1(False) r""" example output: C:\Users\user\Desktop>python filedialog_problem.py Windows fatal exception: code 0x8001010e Thread 0x00000e18 (most recent call first): File "C:\Users\user\Desktop\filedialog_problem.py", line 17 in filedialog1 File "C:\Users\user\Desktop\filedialog_problem.py", line 47 in <module> Windows fatal exception: code 0x8001010e Thread 0x00000e18 (most recent call first): File "C:\Users\user\Desktop\filedialog_problem.py", line 17 in filedialog1 File "C:\Users\user\Desktop\filedialog_problem.py", line 47 in <module> Windows fatal exception: code 0x8001010e ... """The only workarounds I know so far are:
- using non-native file dialogs
- ignoring these errors
- opening a file dialog before extracting the icon
Are there any other possibilities to prevent the errors?
Or is this normal behavior and I am missing something? -
Hi @SGaist
yes, I also tried the suggestions in the linked thread, but none of them solved the problem:
- tried it on a Laptop with Win10 and in a fresh VM with Win10
- tried it with a new Qt version (6.5.0)
- disabled anti-virus and tamper protection
- tried DontUseCustomDirectoryIcons
- tried with different Python versions
- tried time.sleep(...) between commands
The strange thing is that opening the native Windows file dialog and closing it again before getting the icon data makes a difference.
I also searched for the error code (here for example), but there was nothing that solved the problem.
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I think you have enough material to open a ticket on the bug report system.
