Dart

Bind and Listen on an Available Port in a Range

Demonstrates Socket.BindAndListenPortRange, which searches an inclusive port range for an available TCP port, binds it, and begins listening. It returns the selected port, or -1 on failure.

Background. This is useful when any of several ports is acceptable and the application needs to discover which one was bound.

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Dart

import 'package:chilkat/chilkat.dart';

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

  // Search the inclusive port range for an available TCP port, bind it, and begin listening.  The
  // method returns the selected port, or -1 when no port can be bound.
  final boundPort = socket.bindAndListenPortRange(5000, 5100, 25);
  if (boundPort < 0) {
    print(socket.lastErrorText);
    return;
  }

  print('Listening on port $boundPort');
}