How to return socket data from Future in Dart?

This might work. I think you should read up about streams/futures/async/await, though.

Future<String> _handle(String _request) async {  print("Future Starts Here");  print("Request: $_request");    _errorData = "Server_Error";    if (_request != null) {      print("Request has data");      // =============================================================      Socket _socket;      await Socket.connect("192.168.22.120”, 3000).then((Socket sock) {        _socket = sock;      }).then((_) {        print("Socket sends data to database");        // SENT TO SERVER ************************        _socket.write('$_request\r\n');        return _socket.first;      }).then((data) {        print("Socket start to listen to database");        // GET FROM SERVER *********************        _secureResponse =  new String.fromCharCodes(data).trim();        print("(1) $_secureResponse");      }).catchError((AsyncError e) {        _secureResponse = _errorData;        print("(3) $_secureResponse");        exit(1);      });      // ==============================================================    } else {      _secureResponse = _errorData;      print("(4) $_secureResponse");    }  print("(6) $_secureResponse");  print("Future Ends Here");  return _secureResponse;}