analyzeImage not throw error when picking non-Qr image on iOS

[congnguyen-prismtech]

I'm using analyzeImage to read a non-QR after picking it on iOS. The app not throw any exception. So that i can't show the toast when picked failure. Please help me solve it.

[navaronbracke]

In that case you probably receive null as result? This is intentional behavior, though, so that users don't have to handle an extra error. You probably want to check that the file is an image file, before passing it to analyze image.

[congnguyen-prismtech]

Hi @navaronbracke there is a different between Android and iOS.
in Android, after picking a non-QR code, it continue execute the next line. So that i can show a toast: "Your QR code is not valid".
Meanwhile, in iOS, the function is stopped at analyzeImage and not execute the next line whenever i pick a non-QR code. Therefore, it can't show the toast: "Your QR code is not valid".
My expectation is can show that toast whenever i pick a non-QR code in iOS.

[navaronbracke]

I see. Yes, this should not have behavioral differences between platforms.

[navaronbracke]

On Android it returns the error from MLKit:
https://github.com/juliansteenbakker/mobile_scanner/blob/master/android/src/main/kotlin/dev/steenbakker/mobile_scanner/MobileScanner.kt#L487 and https://github.com/juliansteenbakker/mobile_scanner/blob/master/android/src/main/kotlin/dev/steenbakker/mobile_scanner/MobileScannerHandler.kt#L30-L35

But on the old iOS implementation, it does not: https://github.com/juliansteenbakker/mobile_scanner/blob/master/ios/Classes/MobileScanner.swift#L435-L447

On the new iOS/MacOS version (which uses the Vision API), we return nil:
https://github.com/juliansteenbakker/mobile_scanner/blob/ios-vision/darwin/mobile_scanner/Sources/mobile_scanner/MobileScannerPlugin.swift#L652-L666

I'll probably fix this in the new implementation, as the Vision API generally outperforms the MLKit one.

Thanks for reporting!

[lpl-code-github]

Even though I selected an image with a QR code, I didn't analyze it? Always waiting