Android™

TCP Socket Send Byte and Receive Byte

Demonstrates the Chilkat Socket ReceiveByte and SendByte method. Android™

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    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) {
        Log.i(TAG, 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) {
        Log.i(TAG, sock.lastErrorText());
        return;
        }

    //  Let's look at the value of the byte received.  It should be 96.
    Log.i(TAG, String.valueOf(sock.get_ReceivedInt()));

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

    //  Should be decimal 10.
    Log.i(TAG, String.valueOf(sock.get_ReceivedInt()));

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}