Cannot start counter app right after installation

[sagism]

% pip install flet
...
% python counter.py
App URL: http://127.0.0.1:64269
Connected to Flet app and handling user sessions...
The application cannot be opened for an unexpected reason, error=Error Domain=NSOSStatusErrorDomain Code=-10827 "kLSNoExecutableErr: The executable is missing" UserInfo={_LSLine=3665, _LSFunction=_LSOpenStuffCallLocal}

Python 3.10.4.
Clean virtualenv (only flet installed)

MacOS Big Sur (11.1)

[Dave-DigiMim]

Will flet run on Raspberry Pi?
I tried the sample counter.py but got this

Traceback (most recent call last):
File "counter.py", line 29, in
flet.app(target=main)
File "/home/pi/.local/lib/python3.7/site-packages/flet/flet.py", line 113, in app
fvp = _open_flet_view(conn.page_url)
File "/home/pi/.local/lib/python3.7/site-packages/flet/flet.py", line 396, in _open_flet_view
return subprocess.Popen(args)
File "/usr/lib/python3.7/subprocess.py", line 775, in init
restore_signals, start_new_session)
File "/usr/lib/python3.7/subprocess.py", line 1522, in _execute_child
raise child_exception_type(errno_num, err_msg, err_filename)
OSError: [Errno 8] Exec format error: '/tmp/flet-0.1.49/flet/flet'

[FeodorFitsner]

@sagism What OS/version is that?

[FeodorFitsner]

@sagism it couldbe an error related to macOS Launch Services. I've never experienced such an error myself, but found this: actions/runner-images#4545

Look at the 2nd workaround here: actions/runner-images#4545 (comment)
To fix Simulator.app package they run /System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -f <path-to.app>

Flet.app is unpacked to $TMPDIR/flet-{version}/Flet.app, you can find its full path with ls $TMPDIR/flet*.

Then try running:

/System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -f <path-to-Flet.app>

and then open Flet.app with:

open <path-to-Flet.app>

You should see a blank window which means it's fine.
Try running Flet Python app again and see if the window is opening.

lregister docs: https://ss64.com/osx/lsregister.html

@mikaelho could be a solution for your issue?

[Dave-DigiMim]

Raspberry pi os. BusterSent from my Galaxy -------- Original message --------From: Feodor Fitsner ***@***.***> Date: 2022/08/12 18:36 (GMT+02:00) To: flet-dev/flet ***@***.***> Cc: Dave Ingram ***@***.***>, Comment ***@***.***> Subject: Re: [flet-dev/flet] Cannot start counter app right after installation (Issue #181) @sagism What OS/version is that? —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you commented.Message ID: ***@***.***>

[FeodorFitsner]

@Dave-DigiMim OK, Flutter is supported on Linux ARM64 platform: flutter/flutter#56992 (comment)

The app should be built on Linux ARM64 though - cross-compilation is not supported. I created #186 to track that effort.

I'm going to leave this issue open to deal with original macOS-based issue.

[FeodorFitsner]

@Dave-DigiMim We've just released Flet 0.1.50 with Linux ARM64 support! Could you please upgrade flet module to the latest version (pip install flet --upgrade) and run your Python Flet program again. Let me know if you have a UI now!

[FeodorFitsner]

@Dave-DigiMim It's for Raspberry Pi OS 64-bit, obviously...

[Dave-DigiMim]

Ah I am on 32bit. Sent from my Galaxy -------- Original message --------From: Feodor Fitsner ***@***.***> Date: 2022/08/14 04:43 (GMT+02:00) To: flet-dev/flet ***@***.***> Cc: Dave Ingram ***@***.***>, Mention ***@***.***> Subject: Re: [flet-dev/flet] Cannot start counter app right after installation (Issue #181) @Dave-DigiMim We've just released Flet 0.1.50 with Linux ARM64 support! Could you please upgrade flet module to the latest version (pip install flet --upgrade) and run your Python Flet program again. Let me know if you have a UI now! —Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you were mentioned.Message ID: ***@***.***>

[FeodorFitsner]

I knew it! :) OK, 32-bit ARM is more challenging, let's see.

[FeodorFitsner]

Oh, there is an open issue to support Flutter on 32-bit ARM: flutter/flutter#75823 Looks like people use flutter-pi to make it work on 32-bit ARM devices, but I'm not familiar with it. I'm opening a new issue to track that: #191