Java

Socket Receive String Until Specific Byte Value is Received

Demonstrates the Chilkat Socket ReceiveStringUntilByte 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 some strings, each terminated by a 0 byte.
    sock.SendString("This is the 1st string");
    sock.SendByte(0);
    sock.SendString("This is string number 2");
    sock.SendByte(0);

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

    //  Now let's receive what is echoed back....
    //  Receive each string and the NULL byte.
    //  The call to ReceiveStringUntilByte will receive incoming data until the lookForByte is encountered.
    //  The lookForByte is receive and discarded (it is not returned in the string)
    int lookForByte = 0;
    String s1 = sock.receiveStringUntilByte(lookForByte);
    if (sock.get_LastMethodSuccess() == false) {
        System.out.println(sock.lastErrorText());
        return;
        }

    System.out.println(s1);

    String s2 = sock.receiveStringUntilByte(lookForByte);
    if (sock.get_LastMethodSuccess() == false) {
        System.out.println(sock.lastErrorText());
        return;
        }

    System.out.println(s2);

    //  The echo server will also echo back the final LF
    sock.ReceiveByte(true);
    maxWaitMs = 100;
    sock.Close(100);

    //  Output:
    //  This is the 1st string
    //  This is string number 2
  }
}