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To decipher FNC1 codes within a GS1-128 barcode in Flutter, you can use a barcode scanning package such as the "barcode_scan" package.

1. Import the package at the top of your Dart file:

import 'package:barcode_scan/barcode_scan.dart';

1. Create a function to handle barcode scanning:

Future<void> scanBarcode() async {
    try {
        var result = await BarcodeScanner.scan();
        // result.rawContent will contain the scanned barcode
        // Decipher the FNC1 codes from the rawContent using GS1 specification guidelines
    } catch (e) {
        if (e.code == BarcodeScanner.cameraAccessDenied) {
            print('The user did not grant the camera permission!');
        } else {
            print('Unknown error: $e');
        }
    }
}

1. Use the GS1 specification guidelines to decipher the FNC1 codes from the rawContent. Here's an example of how to split the GS1-128 barcode into its component parts:

final rawContent = result.rawContent;
final codeList = rawContent.split(String.fromCharCode(29));
final applicationIdentifier = codeList[0].substring(1);
final content = codeList[1];
print('Application Identifier: $applicationIdentifier');
print('Content: $content');

Note: FNC1 codes are represented by the ASCII character 29 (GS character) in GS1-128 barcodes. They are used to indicate where an application identifier (AI) ends and the data begins.