Java

Bind and Listen on a Randomly Selected Unused Port

See more Socket/SSL/TLS Examples

Demonstrates how to bind and listen on a randomly selected unused port.

Note:The ListenPort property used in this example is available starting in Chilkat v9.5.0.59.

Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    CkSocket listenSocket = new CkSocket();

    //  Pass a value of 0 for the port number to randomly select
    //  an unused port.
    //  (The 2nd argument allows for a backlog of 25 pending connection requests when accepting connections.)
    success = listenSocket.BindAndListen(5555,25);
    if (success != true) {
        System.out.println(listenSocket.lastErrorText());
        return;
        }

    //  Find out what port was chosen.
    //  Note: The ListenPort propety was added in Chilkat v9.5.0.59
    int listenPort = listenSocket.get_ListenPort();
    System.out.println("Chosen listen port = " + listenPort);
  }
}