Add onError function

[thomtomdup]

Hello.

I have tried your package but there is no return error function.

I have investigate the code and i have the idea to add onError function call.

/-----------------------------------------------------------------/

In MobileScanner class

StreamSubscription<MobileScannerException>? _errorcodesSubscription;
in _MobileScannerState class. That will be listen in initstate() :

_errorcodesSubscription = _controller.errorcode.listen( widget.onError, );

and add "onError" in the MobileScanner required param.

/-----------------------------------------------------------------/

In MobileScannerController class add this :

final StreamController<MobileScannerException> _errorController =
StreamController.broadcast();
Stream<MobileScannerException> get errorcode => _errorController.stream;

In the function Future<MobileScannerArguments?> start, add in switch case the add stream value of the
MobileScannerErrorCode like this :

_errorController.add( const MobileScannerException( errorCode: MobileScannerErrorCode.genericError ) );

/-----------------------------------------------------------------/

Hope that you can understand. If need, i can give files of changed class.

Thank you,
Regards

[BBQRIBS72]

I'm not sure about the implementation of this, I haven't read enough of the package but this seems like a great idea.

I can't currently find a way to catch 'No camera found or failed to open camera!' when on a device without a camera in this package. I am having to import another package to check if a camera is available before using MobileScanner. It would be nice if there was a check if a camera is available in this package or a way to handle errors thrown by the mobile scanner.

If there is already a way that I have missed then my bad!

Example of what I would like to be able to do:

if (MobileScanner.cameraIsAailable() .... show my mobile scanner

Or alternatively

MobileScanner(
onError: (err) => ... maybe show a snackbar with the error.
)

[thomtomdup]

By adding this implementation, we can use all of packages that could help to detect the problem directely in the function error. This just help to find a way of problem detection to analyse when Mobile Scanner don't work and push a popup error screen for example.

[juliansteenbakker]

I just released v3.0.0 which has an onError widget. Please see the example app for more information.