How can I convert string to utf8 in Dart?

Question

I am using aqueduct web api framework to support my flutter app. In my api backend I need to connect local network socket services. My problem is that I can't return the exact string (in tr). So, How can I convert string to utf8 in Dart?

Example:

@httpGet
Future<Response> getLogin() async {
  Socket.connect('192.168.1.22’, 1024).then((socket) async {
    socket.listen((data) {
      // Expected return is: 1:_:2:_:175997:_:NİYAZİ TOROS
      print(new String.fromCharCodes(data).trim());
      xResult = new String.fromCharCodes(data).trim();
      print("xResult: $xResult");
    }, onDone: () {
      print("Done");
      socket.destroy();
    });

    socket.write('Q101:_:49785:_:x\r\n');
  });

  return new Response.ok(xResult);
}

The return is not in TR-tr language format.

Return text looks like: 1::2::175997:_:NÝYAZÝ TOROS

Correct must be: 1::2::175997:_:NİYAZİ TOROS

UPDATE:

1. xResult = new String.fromCharCodes(data).trim();
2. print(xResult);
3. responseBody = xResult.transform(utf8.decoder);
4. print(responseBody);

I can print the xResult but cannot print the responseBody after trying convert to UTF8

Answer 1

import 'dart:convert' show utf8;

var encoded = utf8.encode('Lorem ipsum dolor sit amet, consetetur...');
var decoded = utf8.decode(encoded);

See also https://api.dartlang.org/stable/1.24.3/dart-convert/UTF8-constant.html

There are also encoder and decoder to be used with streams

File.openRead().transform(utf8.decoder).

See also https://www.dartlang.org/articles/libraries/converters-and-codecs#converter

Answer 2

utf8.decode(stringData.runes.toList()),

This could be used to get the UTF-8 in flutter. here the stringData string will contain the necessary data with UTF-8 content.

Answer 3

Try to use utf-8 convertion Use this code

 final message =  utf8.decode(data);

Instead of this

final message = String.fromCharCodes(data);

import

 import 'dart:convert';

 void handleConnection(Socket client) {
print('Connection from'
    ' ${client.remoteAddress.address}:${client.remotePort}');

// listen for events from the client
client.listen(
  // handle data from the client
  (Uint8List data) async {
    await Future.delayed(Duration(seconds: 1));
    final message =  utf8.decode(data);
    // final message = String.fromCharCodes(data);
    int length = messageWidgets.length;
    Widget padding2 = Padding(
      padding: const EdgeInsets.all(8.0),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.start,
        children: [
          Expanded(
            flex: 1,
            child: GestureDetector(
                onLongPress: () {
                  _copy(message);
                },
                onDoubleTap: () {
                  setState(() {
                    messageWidgets.removeAt(length);
                  });
                },
                child: Container(
                  padding: EdgeInsets.all(8.0),
                  decoration: BoxDecoration(
                    borderRadius: BorderRadius.circular(10),
                    color: Color(0xDD44871F),
                  ),
                  child: Stack(
                    children: <Widget>[
                      Column(
                        // direction: Axis.vertical,
                        children: [
                          Text("${client.remoteAddress.host}::-",
                              style: TextStyle(color: Colors.black87)),
                          Text("${message}",
                              style: TextStyle(color: Colors.black87)),
                        ],
                      )
                    ],
                  ),
                )),
          ),
          Expanded(
            flex: 1,
            child: Container(),
          ),
        ],
      ),
    );
    setState(() {
      messageWidgets.add(padding2);
    });
  },

  // handle errors
  onError: (error) {
    print(error);
    setMwidget(error);
    client.close();
  },

  // handle the client closing the connection
  onDone: () {
    print('Client left');
    client.close();
  },
);

}