Dart

Send StringBuilder Contents over a Socket

Demonstrates Socket.SendSb, which encodes the contents of a StringBuilder using StringCharset and sends the resulting bytes.

Background. Text send and receive operations encode and decode bytes using the StringCharset property. For plain ASCII or UTF-8 protocols, setting StringCharset to utf-8 is a safe default.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  final socket = CkSocket();

  // Connect to the server using TLS.  The 3rd argument enables the TLS handshake after the TCP
  // connection succeeds; the 4th is the maximum time to wait, in milliseconds.
  final bTls = true;
  final maxWaitMs = 5000;
  try {
    socket.connect('example.com', 5000, bTls, maxWaitMs);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // StringCharset controls the character encoding used when sending and receiving text.
  socket.stringCharset = 'utf-8';

  // Build the text to send in a StringBuilder, then send its contents.
  final sb = CkStringBuilder();
  sb.append('SET temperature 21\r\n');

  try {
    socket.sendSb(sb);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Message sent.');
}