Java

TCP Socket Send Byte and Receive Byte

Demonstrates the Chilkat Socket ReceiveByte and SendByte method. 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 sock = new CkSocket();

    //  --------------------------------------------------------------------
    //  This example uses the public TCP echo service at https://tcpbin.com/
    //  --------------------------------------------------------------------

    boolean useTls = false;
    int port = 4242;
    int maxWaitMs = 5000;
    success = sock.Connect("tcpbin.com",port,useTls,maxWaitMs);
    if (success == false) {
        System.out.println(sock.lastErrorText());
        return;
        }

    //  Wait a max of 2 seconds for a response..
    sock.put_MaxReadIdleMs(2000);

    //  Send a byte.
    sock.SendByte(96);

    //  The tcpbin.com echo server only echoes after receiving an LF (linefeed char)
    sock.SendByte(10);

    //  The echo server will echo back whatever is sent to it.
    //  We should be able to read the same byte back..
    //  After successfully reading, the byte value is available in the ReceivedInt property.
    boolean treatAsUnsignedInt = true;
    success = sock.ReceiveByte(treatAsUnsignedInt);
    if (success == false) {
        System.out.println(sock.lastErrorText());
        return;
        }

    //  Let's look at the value of the byte received.  It should be 96.
    System.out.println(sock.get_ReceivedInt());

    //  The echo server also echoed the LF back.
    success = sock.ReceiveByte(treatAsUnsignedInt);
    //  Assuming success..

    //  Should be decimal 10.
    System.out.println(sock.get_ReceivedInt());
  }
}