Crash metadataOutput AVCaptureMetadata about fast_barcode_scanner HOT 6 CLOSED

Do you know more parameters to the crash? Like which devices are affected or which version of iOS?

Demangled symbol:

function signature specialization of fast_barcode_scanner.BarcodeReader.metadataOutput(_: __C.AVCaptureMetadataOutput, didOutput: Swift.Array<__C.AVMetadataObject>, from: __C.AVCaptureConnection) -> ()

Which is

func metadataOutput(_ output: AVCaptureMetadataOutput,
                        didOutput metadataObjects: [AVMetadataObject],
                        from connection: AVCaptureConnection) {
		guard
			let metadata = metadataObjects.first,
			let readableCode = metadata as? AVMetadataMachineReadableCodeObject
			else { return }

		pauseIfRequired()

		codeCallback([flutterMetadataObjectTypes[readableCode.type]!, readableCode.stringValue!])
	}

The only possible cause could be the force unwrappings here: [flutterMetadataObjectTypes[readableCode.type]!, readableCode.stringValue!].

The first one is really unlikely to have caused the crash, because AVFoundation supports a fixed range of code types which I just copied into flutterMetadataObjectTypes.

Are there code types that do not have a value?

Anyway I guess it would be good to have both unwrappings in the guard statement as it is in #17.

from fast_barcode_scanner.

I do not know what code types do not have a value. I think you are correct. I have modified the code in my project below and will see if the crash goes away. Do you want me to do a PR, or do you want to make the change?

Thank you for looking into this error.

func metadataOutput(_ output: AVCaptureMetadataOutput,
                        didOutput metadataObjects: [AVMetadataObject],
                        from connection: AVCaptureConnection) {
		guard
			let metadata = metadataObjects.first,
			let readableCode = metadata as? AVMetadataMachineReadableCodeObject,

			let type = flutterMetadataObjectTypes[readableCode.type],
        	        let value = readableCode.stringValue
			
			else { return }

	

		pauseIfRequired()

		codeCallback([type, value])
	}

from fast_barcode_scanner.

Did we fix this issue in the develop branch?
Not sure where we left of.

from fast_barcode_scanner.

I did not edit development. I ended up trying this package instead: https://pub.dev/packages/fl_mlkit_scanning. It seems really good, but possibly cpu intensive. I may try your cpu tests to see how it compares to AVFoundation.

from fast_barcode_scanner.

Too bad. The force unwrapping is gone on develop branch, so the bug should not happen on there, if you like to try again!

from fast_barcode_scanner.

Thanks, I will try again. I appreciate you fixing the issues!

from fast_barcode_scanner.