NoSuchMethodError (NoSuchMethodError: Class 'String' has no instance getter 'code' - flutter

Question

Full error -
NoSuchMethodError (NoSuchMethodError: Class 'String' has no instance getter 'code'.
Receiver: "http://download.jimicloud.com/webDown/mibike?no=75039909"
Tried calling: code)
Hi all! I'm trying to scan the qr code and send the data to the server, but I'm running into the error you see above.
Package for code scanning - qr_code_scanner: ^1.0.1
Here is my scan widget code -
import 'dart:developer';
import 'package:eco_city/features/presentation/scanner/cubit/scanner_cubit.dart';
import 'package:eco_city/features/presentation/scanner/cubit/scanner_state.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:http/http.dart';
// import 'package:mobile_scanner/mobile_scanner.dart';
import 'dart:io';
import '../home/home.dart';
import 'package:qr_code_scanner/qr_code_scanner.dart';
class MyQr extends StatelessWidget {
#override
Widget build(BuildContext context) {
return BlocProvider<ScannerCubit>(
create: (context) => ScannerCubit(),
child: QRViewExample(),
);
}
}
class QRViewExample extends StatefulWidget {
#override
_QRViewExampleState createState() => _QRViewExampleState();
}
class _QRViewExampleState extends State<QRViewExample> {
final GlobalKey qrKey = GlobalKey(debugLabel: 'QR');
Barcode? result;
QRViewController? controller;
// In order to get hot reload to work we need to pause the camera if the platform
// is android, or resume the camera if the platform is iOS.
#override
void reassemble() {
super.reassemble();
print('первая функция');
if (Platform.isAndroid) {
controller!.pauseCamera();
} else if (Platform.isIOS) {
controller!.resumeCamera();
}
}
getQr(qr) {
if (qr != null) {
RegExp exp = RegExp(r"[^0-9]+");
final stringFormat = qr.code.rawContent.replaceAll(exp, '');
return stringFormat;
}
}
#override
Widget build(BuildContext context) {
return BlocBuilder<ScannerCubit, ScannerState>(
builder: (context, state) {
if (state is ScannerNotScan) {
return SafeArea(
child: Scaffold(
body: Column(
children: <Widget>[
Expanded(
flex: 5,
child: QRView(
key: qrKey,
onQRViewCreated: _onQRViewCreated,
),
),
Expanded(
flex: 1,
child: Center(
child: (result != null)
? Text(
'Barcode Type: ${describeEnum(result!.format)} Data: ${result!.code}')
: Text('Scan a code'),
),
)
],
),
));
} else if (state is ScannerLoading) {
return Scaffold(
body: Center(child: CircularProgressIndicator()),
);
} else if (state is ScannerLoaded) {
return Scaffold(
body: Center(child: Text('Успех!')),
);
} else if (state is ScannerError) {
return Scaffold(
body: Center(child: Text('Ошибка!')),
);
}
throw StateError('err');
},
);
}
void _onQRViewCreated(QRViewController controller) async {
print('последняя функция');
this.controller = controller;
controller.scannedDataStream.listen((scanData) {
setState(() {
result = scanData;
if (result != null) {
getNextScreen();
}
});
});
}
void getNextScreen() async {
if (result != null) {
await context.read<ScannerCubit>().scanner(getQr(result!.code));
// log(await getQr(result!.code.toString()));
}
}
#override
void dispose() {
controller?.dispose();
super.dispose();
}
}
And here is my cubit -
import 'dart:convert';
import 'dart:developer';
import 'package:eco_city/features/data/scanner/scanner_models.dart';
import 'package:eco_city/features/presentation/scanner/cubit/scanner_state.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:http/http.dart' as http;
import '../../config.dart';
class ScannerCubit extends Cubit<ScannerState> {
ScannerCubit? bloc;
ScannerCubit() : super(ScannerNotScan());
Future<void> scanner(String qr) async {
if (isClosed) return;
emit(ScannerLoading());
final prefs = await SharedPreferences.getInstance();
final token = prefs.getString('token');
final response = await http.post(Uri.parse(ConfigUrl.sendQrCodeScanner),
headers: {
"Content-Type": "application/vnd.api+json",
"Accept": "application/vnd.api+json",
"Authorization": "Bearer $token"
},
body: jsonEncode(<String, dynamic>{
"qr_code": qr,
}));
if (isClosed) return;
if (response.statusCode == 200) {
log(qr);
final responseJson = json.decode(response.body) as Map<String, dynamic>;
emit(ScannerLoaded(scannerModel: ScannerModel.fromJson(responseJson)));
} else {
log(qr);
log(response.statusCode.toString());
log(json.decode(response.body).toString());
emit(ScannerError());
}
}
}
I don’t understand at all what the error is, and how can I send ONLY numbers to the server?
and my vscode -

Answer 1

first print the this line *** log(await getQr(result!.code.toString())) ****
and check whether is function is return the value or returning the null.