Program crashes when Capslock/language change pressed.

[asipo]

I am trying hid_listener 2.0.1 to get keyboard/mouse event on my flutter app.
Anroid Studio, Mac Air M1

Following the instruction on the website,

• modify MainFlutterWindow.swift
• add
  if (getListenerBackend() != null) {
  if (!getListenerBackend().initialize()) {
  print("Failed to initialize listener backend");
  }
  } else {
  print("No listener backend for this platform")
  }
• then I run the app, it immediately crashes when I press Capslock(English/Korean) key. Otherwise, it looks OK.

Any idea why this happens?

[localcc]

Are there any logs appearing right before the crash, or does it just quit silently?

[asipo]

It just says:
Lost connection to device.
the Dart compiler exited unexpectedly.

That's all..

[localcc]

The app is not running on android right? Also which Mac OS version are you on?

[asipo]

Thank you for your prompt reply.

macOS is Sonoma 14.1.2

• When I run flutter doctor,

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel master, 3.18.0-19.0.pre.95, on macOS 14.1.2 23B92 darwin-arm64, locale ko)
[✓] Android toolchain - develop for Android devices (Android SDK version 34.0.0)
[✓] Xcode - develop for iOS and macOS (Xcode 15.0.1)
[✓] Chrome - develop for the web
[✓] Android Studio (version 2022.3)
[✓] Connected device (2 available)
[✓] Network resources

• No issues found!

• The whole message from building to crashing,

Launching lib/main.dart on macOS in debug mode...
Building macOS application...
--- xcodebuild: WARNING: Using the first of multiple matching destinations:
{ platform:macOS, arch:arm64, id:00008103-001550321E8A001E }
{ platform:macOS, arch:x86_64, id:00008103-001550321E8A001E }
Debug service listening on ws://127.0.0.1:49615/P3BocaPNyg4=/ws
Syncing files to device macOS...
flutter: not null
flutter: initialization listener backend success
[GETX] Instance "GetMaterialController" has been created
[GETX] Instance "GetMaterialController" has been initialized
2024-01-08 13:30:54.088 knkbuilder[1869:20346] WARNING: Secure coding is automatically enabled for restorable state! However, not on all supported macOS versions of this application. Opt-in to secure coding explicitly by implementing NSApplicationDelegate.applicationSupportsSecureRestorableState:.
Lost connection to device.
the Dart compiler exited unexpectedly.

• Then I am prompted to send report to Apple, attached below.
  errorReport.txt

This happens even when I just include getListenerBackend()!.initialize() without adding listener.

[localcc]

Could you try and see if this issue occurs on the nsevent_queue branch?

[asipo]

That's beyond my programming ability.
Actually, this is my first program to work on macOS, migrating windows C# code to flutter.
It doesn't look like a simple problem, requires digging into OS related stuff.

I appreciate your kind support, but I better find another way.

[asipo]

When I tested the example code, the program crashes with the output,
(the listener event handler in your code is
void listener(RawKeyEvent event) {
print(
"${event is RawKeyDownEvent} ${event.logicalKey.debugName} ${event.isShiftPressed} ${event.isAltPressed} ${event.isControlPressed}");
}
)
..
flutter: 1121.01953125, 1340.58203125
flutter: false Audio Volume Up false false false
flutter: false Audio Volume Up false false false
Lost connection to device.
the Dart compiler exited unexpectedly.

When I press Audio Volume Up key, the output is
flutter: true Audio Volume Up false false false
flutter: false Audio Volume Up false false false

When I close the window, the output is
flutter: false Audio Volume Up false false false
flutter: 806.734375, 1607.078125
flutter: false Audio Volume Up false false false

I also tested RawKeyUpEvent instead of RawKeyDownEvent.
So it seems that when the program exits, or capslock pressed, the key up event of Audio Volume Up occurs twice in a row without key down event.

Do you have any idea for this?