client_socket.dart

import 'dart:io';

Socket? socket;

void main() {
  Socket.connect("localhost", 4567).then((Socket sock) {
    socket = sock;
    if (socket == null) {
      throw Exception("Invalid Socket");
    }
    socket?.listen(dataHandler,
        onError: errorHandler, onDone: doneHandler, cancelOnError: false);
  }).catchError((e) {
    print("Unable to connect: $e");
    exit(1);
  });

  //Connect standard in to the socket
  stdin.listen((data) {
    socket?.write(new String.fromCharCodes(data).trim() + '\n');
  });
}

void dataHandler(data) {
  print(new String.fromCharCodes(data).trim());
}

void errorHandler(error, StackTrace trace) {
  print(error);
}

void doneHandler() {
  socket?.destroy();
  exit(0);
}