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@@ -1,5 +1,9 @@ # tryfle A look at flet for building cross platform apps +My team lead got all exited about this thing called flet for whipping out python data at a glance (using it as a web app) I had never heard of it but I have spent years developing multiplatform gui applications using wxpython so I thought I would give it a try. + +Most of the stuff that follows is based on the default app that you get when you install flet and 'flet create' an app. it is a box with a number and a button that increments it. + ## Flet on macos (tahoe) Installing and trying flet on macos was relatively painless. @@ -105,15 +109,151 @@ But it looks and feels more like a mac app. ### cross compiling on the mac (FAIL) -YOU ARE HERE. +I have a few raspberry pi's which have displays and which I plan to embed in various things throwing up a nice display quickly is very appealing. So my first thought was to cross compile from the mac to linux. (I knew this was a long shot) + +```sh +feurig@pj tryfle % flet build linux --arch=aarch64 +[21:55:36] Build Platform Matrix + ┏━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━━━━━━━━━━━┓ + ┃ Command ┃ Platform ┃ + ┡━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━━━━━━━━━━━┩ + │ flet build windows │ Windows │ + ├──────────────────────────┼───────────────────────┤ + │ flet build macos │ macOS │ + ├──────────────────────────┼───────────────────────┤ + │ flet build linux │ Linux │ + ├──────────────────────────┼───────────────────────┤ + │ flet build web │ macOS, Windows, Linux │ + ├──────────────────────────┼───────────────────────┤ + │ flet build apk │ macOS, Windows, Linux │ + ├──────────────────────────┼───────────────────────┤ + │ flet build aab │ macOS, Windows, Linux │ + ├──────────────────────────┼───────────────────────┤ + │ flet build ipa │ macOS │ + ├──────────────────────────┼───────────────────────┤ + │ flet build ios-simulator │ macOS │ + └──────────────────────────┴───────────────────────┘ +╭───────────────────────────────────────────────────────────────────────────────────────╮ +│ You can't build │ +╰───────────────────────────────────────────────────────────────────────────────────────╯ +``` ### cross compiling on debian (FAIL) -AND HERE +Ok so I really don't want to build on an underpowered little device when I have a relatively beefy linux box in the basement. + +```sh +feurig@nick:~/Projects/tryfle$ PATH=$PATH:/tank/home/feurig/flutter/3.41.4/bin flet build linux --arch=aarch64 +[21:46:37] Created app shell ✅ +[21:46:38] Packaged Python app ✅ +[21:46:44] Customized app icons ✅ +[21:46:47] Generated app icons ✅ +[21:46:55] Resolving dependencies... +...blah blah blah + Building Linux application... + + ERROR: Target dart_build failed: Error: Failed to find any of in + LocalDirectory: '/usr/lib/llvm-19/bin' + Build process failed +... more blah blah ... ╭───────────────────────────────────────────────────────────────────────────────────────╮ +│ Error building Flet app - see the log of failed command above. │ +╰───────────────────────────────────────────────────────────────────────────────────────╯ +feurig@nick:~/Projects/tryfle$ ls -lsa /usr/lib/llvm-19/ +total 48 + 4 drwxr-xr-x 8 root root 4096 Apr 27 14:58 . + 4 drwxr-xr-x 73 root root 4096 Apr 30 16:40 .. + 4 drwxr-xr-x 2 root root 4096 Apr 27 14:57 bin + 4 drwxr-xr-x 4 root root 4096 Apr 27 14:58 build + 0 lrwxrwxrwx 1 root root 14 Jun 14 2025 cmake -> lib/cmake/llvm + 4 drwxr-xr-x 2 root root 4096 Apr 27 14:58 include +20 drwxr-xr-x 6 root root 20480 Apr 27 14:58 lib + 4 drwxr-xr-x 2 root root 4096 Apr 27 14:49 libexec + 4 drwxr-xr-x 8 root root 4096 Apr 27 14:58 share +``` + +flutter bitches about something that is clearly there. + +### compiling on debian (FAIL) + +Lets see if it even compiles natively + +```sh +feurig@nick:~/Projects/tryfle$ PATH=$PATH:/tank/home/feurig/flutter/3.41.4/bin flet build linux +[20:51:26] Packaged Python app ✅ +[20:51:33] Building Linux application... + + ERROR: Target dart_build failed: Error: Failed to find any of in + LocalDirectory: '/usr/lib/llvm-19/bin' + Build process failed +... blah blah blah ... +╭───────────────────────────────────────────────────────────────────────────────────────╮ +│ Error building Flet app - see the log of failed command above. │ +╰───────────────────────────────────────────────────────────────────────────────────────╯ +``` + +NOPE. + +### Running on debian + +Ok so it wont compile will it run? -### cross compiling on rasberian (partial FAIL) +#### running on x (FAIL) -AND HERE +The debian machine is a server so we ssh in and X-forward. + + + +#### running on x using 'flet run --web' and google chrome + +This more or less works so you can still run it on debian + + + +#### JUST DONT PUSH THE INSTALL BUTTON! + +Pushing the install button puts the app in a really nice window where none of the window controls work except for full screan which blacks out most of the screen and wont go back. Maybe it works on a desktop but YUK!!! + + + +### Running on raspberry pi + +Since running on the raspberri pi is good enough for our use case we will start there. + + + +That works! + +### compiling on rasberry pi (FAIL) + +In a rasberry pi 5 flet install an intel binary. That is gobsmacking stupid. + +```sh +feurig@five:~/Projects/tryfle $ flet build linux --arch=aarch64 +[21:27:00] 1 Failed to validate Flutter version. + Flutter SDK not found or invalid version installed. +( ●) Initializing linux build... +Flutter SDK 3.41.4 is required. It will be installed now. Proceed? [y/n] (y): y +[21:27:03] + /home/feurig/flutter/3.41.4/bin/internal/shared.sh: line 273: + /home/feurig/flutter/3.41.4/bin/cache/dart-sdk/bin/dart: cannot execute binary + file: Exec format error + /home/feurig/flutter/3.41.4/bin/internal/shared.sh: line 273: + /home/feurig/flutter/3.41.4/bin/cache/dart-sdk/bin/dart: Success + + /home/feurig/flutter/3.41.4/bin/internal/shared.sh: line 273: + /home/feurig/flutter/3.41.4/bin/cache/dart-sdk/bin/dart: cannot execute binary + file: Exec format error + /home/feurig/flutter/3.41.4/bin/internal/shared.sh: line 273: + /home/feurig/flutter/3.41.4/bin/cache/dart-sdk/bin/dart: Success + +╭───────────────────────────────────────────────────────────────────────────────────────╮ +│ Error building Flet app - see the log of failed command above. │ +╰───────────────────────────────────────────────────────────────────────────────────────╯ +feurig@five:~/Projects/tryfle $ file /home/feurig/flutter/3.41.4/bin/cache/dart-sdk/bin/dart +/home/feurig/flutter/3.41.4/bin/cache/dart-sdk/bin/dart: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=a6c2875adfaa96a24e720daaf5261c03f2e7d05f, stripped +feurig@five:~/Projects/tryfle $ +``` +So. Mixed bag so far. ## References diff --git a/docs/images/debianrunxweb.jpg b/docs/images/debianrunxweb.jpg Binary files differnew file mode 100644 index 0000000..6e38b4e --- /dev/null +++ b/docs/images/debianrunxweb.jpg diff --git a/docs/images/debianxrun.jpg b/docs/images/debianxrun.jpg Binary files differnew file mode 100644 index 0000000..4866c00 --- /dev/null +++ b/docs/images/debianxrun.jpg diff --git a/docs/images/raspirun.jpg b/docs/images/raspirun.jpg Binary files differnew file mode 100644 index 0000000..ef3e4ab --- /dev/null +++ b/docs/images/raspirun.jpg diff --git a/docs/images/runweb.jpg b/docs/images/runweb.jpg Binary files differnew file mode 100644 index 0000000..e8f1286 --- /dev/null +++ b/docs/images/runweb.jpg diff --git a/docs/images/whatthefuck.jpg b/docs/images/whatthefuck.jpg Binary files differnew file mode 100644 index 0000000..4a473e3 --- /dev/null +++ b/docs/images/whatthefuck.jpg |
