Send a 4-byte Length Prefix over a Socket

See more Socket/SSL/TLS Examples

Demonstrates Socket.SendCount, which sends a four-byte length prefix in network byte order. This is typically used to tell the peer how many bytes follow.

import 'package:chilkat/chilkat.dart';

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

  // Connect to the server using TLS.
  final bTls = true;
  final maxWaitMs = 5000;
  try {
    socket.connect('example.com', 5000, bTls, maxWaitMs);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Send a four-byte length prefix in network byte order.  A common framing pattern is to send the
  // number of bytes in a message before the message itself, so the peer knows exactly how many bytes
  // to read.
  final messageLength = 512;
  try {
    socket.sendCount(messageLength);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Length prefix sent.');
}