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socketsdartconvertersaqueduct

How can I convert string to utf8 in Dart?


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


Solution

  • 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