FilePicker crash the flet.app() after open directory dialog and choose one directory

[tianzry]

Description

FilePicker crash the flet.app() after open directory dialog and choose one directory

Code example to reproduce the issue:

the code is from project's example: code url

import flet
from flet import (
    ElevatedButton,
    FilePicker,
    FilePickerResultEvent,
    Page,
    Row,
    Text,
    icons,
)


def main(page: Page):
    # Pick files dialog
    def pick_files_result(e: FilePickerResultEvent):
        selected_files.value = (
            ", ".join(map(lambda f: f.name, e.files)) if e.files else "Cancelled!"
        )
        selected_files.update()

    pick_files_dialog = FilePicker(on_result=pick_files_result)
    selected_files = Text()

    # Save file dialog
    def save_file_result(e: FilePickerResultEvent):
        save_file_path.value = e.path if e.path else "Cancelled!"
        save_file_path.update()

    save_file_dialog = FilePicker(on_result=save_file_result)
    save_file_path = Text()

    # Open directory dialog
    def get_directory_result(e: FilePickerResultEvent):
        directory_path.value = e.path if e.path else "Cancelled!"
        directory_path.update()

    get_directory_dialog = FilePicker(on_result=get_directory_result)
    directory_path = Text()

    # hide all dialogs in overlay
    page.overlay.extend([pick_files_dialog, save_file_dialog, get_directory_dialog])

    page.add(
        Row(
            [
                ElevatedButton(
                    "Pick files",
                    icon=icons.UPLOAD_FILE,
                    on_click=lambda _: pick_files_dialog.pick_files(
                        allow_multiple=True
                    ),
                ),
                selected_files,
            ]
        ),
        Row(
            [
                ElevatedButton(
                    "Save file",
                    icon=icons.SAVE,
                    on_click=lambda _: save_file_dialog.save_file(),
                    disabled=page.web,
                ),
                save_file_path,
            ]
        ),
        Row(
            [
                ElevatedButton(
                    "Open directory",
                    icon=icons.FOLDER_OPEN,
                    on_click=lambda _: get_directory_dialog.get_directory_path(),
                    disabled=page.web,
                ),
                directory_path,
            ]
        ),
    )


flet.app(target=main)

Describe the results you received:

When I click the "Open directory" button, choose a directory and click OK, it would return to the main gui window, but wait for few seconds, the app crash, here is the sreen recording:

bandicam.2023-07-09.19-58-18-966.mp4

Describe the results you expected:
After choose the directory, the app shouldn't crash.

Additional information you deem important (e.g. issue happens only occasionally):

Flet version (pip show flet):

Name: flet
Version: 0.8.1
Summary: Flet for Python - easily build interactive multi-platform apps in Python
Home-page:
Author: Appveyor Systems Inc.
Author-email: hello@flet.dev
License: Apache-2.0

Operating system:
Windows 10

Additional environment details:

[tianzry]

I roll back to flet==0.7.4, and it work OK.

[03Jesus]

I got the same error. Like you, rolling back to a previous version it works. I hope it will be fixed in a future update

[yyqdata]

I got the same error. Like you, rolling back to a previous version it works.

[FeodorFitsner]

That might be a bug in file_picker package: miguelpruivo/flutter_file_picker#1317

will take a look.

[hokaso]

#1563 #1562 same issue

[hokaso]

miguelpruivo/flutter_file_picker#1317 (comment)

Since fallback to version 5.3.1 is valid, why don't the next flet version fallback to file_picker version first?

flet/package/pubspec.yaml

Line 35 in 176d5ef

file_picker: ^5.3.0

file_picker: ^5.3.0 → file_picker: 5.3.1
Temporarily locked version
@FeodorFitsner

[hokaso]

My usage scenario is very special. The flet upgrade from 0.7.4 to 0.8.2 reconstructs a lot of authentication code. I have made my project compatible with the latest version, and it is impossible for them to go back to the old version... So I can only wait for the flet to upgrade to the new version, this is the only way.

[hokaso]

This problem has too great an impact. I really hope you can return the version soon. If this continues, all our users will be lost... @FeodorFitsner

[FeodorFitsner]

Sorry for the hassle!

I've rolled back file_picker dependency to 5.2.5 and you can try it be installing this Flet pre-release: https://pypi.org/project/flet/0.9.0.dev1620/

Let me know if that worked.

[hokaso]

Sorry for the hassle!

I've rolled back file_picker dependency to 5.2.5 and you can try it be installing this Flet pre-release: https://pypi.org/project/flet/0.9.0.dev1620/

Let me know if that worked.

Thanks for your attention to this issue and understanding our urgency! I just tested that there is no crash problem, but we are still one step away from the release (https://github.com/flet-dev/flet/releases) You need to release the relevant binaries in releases, and users can complete the complete update.

[FeodorFitsner]

Published as https://pypi.org/project/flet/0.8.4/