Connecting GUI & Application

[null_guy]

hey guys, i'm having a little problem!
I have been able to write a little application on packet sniffing wiz HELP of coarse ! now i want to add a GUI to it! i tried but it won't work......anyone who can help.....PLEASE.....

[Hack]

Welcome to DevX

What have you tried that isn't working?

Why isn't it working? Are you getting errors? If so, what are they?

[null_guy]

I just learnt java.awt and still learning...
I have been able to create a simple frame with action events..

here a sample code

public boolean action(Event e, Object o) {
			if ("Start".equals (o))
				try {
					new packets(); // external class && BIG PROBLEMS
				} catch (IOException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
			else if ("Save".equals (o))
			{
				System.out.println ("Save Me");
				
			}	
			else if ("Quit".equals (o))
				System.exit (0);
			hide();
			return true;
		}

and here are the errors:
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 1
	at packets.<init>(packets.java:50)
	at PopupWindow.action(capture_packet_GUI.java:73)
	at java.awt.Component.handleEvent(Unknown Source)
	at java.awt.Window.postEvent(Unknown Source)
	at java.awt.Component.postEvent(Unknown Source)
	at java.awt.Component.postEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

If anyone can help..please..!

[nspils]

The error message appears related to the "new packets()" statement in your try block. How are you supposed to be constructing a Packets object?

[null_guy]

The packets class works well! i have been able to capture incoming packets.
I just want to place that in a GUI.


Here the new complete code of the GUI:

import java.awt.BorderLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;

import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;


public class capture_packet_GUI extends JPanel implements ActionListener{
static private String newline = "\n";
JButton startButton;
JTextArea log;

public capture_packet_GUI(){
super(new BorderLayout());
log = new JTextArea(10,80); // set size of frame
log.setMargin(new Insets(5,5,5,5));
log.setEditable(false);
JScrollPane logScrollPane = new JScrollPane(log);


startButton = new JButton("Start Capture");
startButton.addActionListener(this);

// another frame for the buttons
JPanel buttonPanel = new JPanel();
buttonPanel.add(startButton);

add(buttonPanel,BorderLayout.PAGE_START);
add(logScrollPane,BorderLayout.CENTER);

}

public void actionPerformed(ActionEvent e){
if(e.getSource() == startButton){
try{
display_packets();
log.append("HAHAHAH working" + newline);
}catch(IOException ioe){
System.out.println("ERROR"+ioe);
}

}
else{
log.append("Cancel" + newline);

}
log.setCaretPosition(log.getDocument().getLength());
}

// a new instance of packets
public void display_packets() throws IOException{
packets p1 = new packets();
System.out.println(p1);

}


public static void createAndShowGUI(){
JFrame frame = new JFrame("FILE CHOOSER 2");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.add(new capture_packet_GUI());
frame.pack();
frame.setVisible(true);

}

public static void main(String args[]){
createAndShowGUI();

}


}
Main Goal :-
I want to print the capture packets in the TextArea [log = new JTextArea(10,80);]!!!

[Razee Marikar]

It might be one of the field / properties in packet class that is initialized outside the constructor. The ArrayOutOfBounds Exception occurs only when an array is accessed that is not initialized or you are accessing a non existent location. Double check that. Maybe you are using some static method / initializer to create the array, and it is not being called.

Include the code for packets.java. It doesn't hurt to check that too. Does it?

[null_guy]

Hmmmm no array has been used so far....(as far as i remeber though) but here you are the packets.java class and packetprinter!!!
please if you just could check that for me PLEASE!!!!

packets.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import jpcap.*;
import jpcap.packet.Packet;

public class packets {
	
	// CONSTRUCTOR
	packets() throws IOException{
		//		Obtain the list of network interfaces
		NetworkInterface[] devices = JpcapCaptor.getDeviceList();
		
		//for each network interface
		for (int i = 0; i < devices.length; i++) {
			//print out its name and description
			System.out.println(i+": "+devices[i].name + "(" + devices[i].description+")");
			//print out its datalink name and description
			System.out.println(" datalink: "+devices[i].datalink_name + "(" + devices[i].datalink_description+")");
		
			//print out its MAC address
			System.out.print(" MAC address:");
		
			for (byte b : devices[i].mac_address)
				 System.out.print(Integer.toHexString(b&0xff) + ":");
				 System.out.println();

				 //print out its IP address, subnet mask and broadcast address		
			for (NetworkInterfaceAddress a : devices[i].addresses)
				 System.out.println(" address:"+a.address + " " + a.subnet + " "+ a.broadcast);
		}	// end for	  
		
		
			/*
		BufferedReader bt = new BufferedReader (new InputStreamReader (System.in));
		int index;
		String str;
		System.out.println ("Enter device number");
		str = bt.readLine();
		index = Integer.parseInt(str);
			*/
		int index = 1;
		
		//Open an interface with openDevice(NetworkInterface intrface, int snaplen, boolean promics, int to_ms)
		JpcapCaptor captor=JpcapCaptor.openDevice(devices[index], 65535, false, 20);
		//captor.setFilter("port 21", true);
		captor.loopPacket(-1, new PacketPrinter());
		
		//captor.processPacket(-1,new PacketPrinter());
		captor.close();

		
	}
		
}

And PacketPrinter.java

import jpcap.PacketReceiver;
import jpcap.packet.Packet;

public class PacketPrinter implements PacketReceiver{

	public void receivePacket(Packet packet) {
		System.out.println(packet);
		
	}

}

try this out and see if you can just make the packet class and the capture_packets_GUI class coexist!!!!

[nspils]

The first thing this constructor does is to create an array of network interfaces through a call to JcapCaptor.

What statement is line 50 of the packets.java code?

[null_guy]

"Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 1"
Actually what does that mean????

The line 50 opens an interface with openDevice(NetworkInterface intrface, int snaplen, boolean promics, int to_ms)

JpcapCaptor captor=JpcapCaptor.openDevice(devices[index], 65535, false, 20);

what's wrong with this line????

[nspils]

You have hard-coded index to equal 1. If there are not at least two devices, your attempt to call devices[1] will be out of bounds

[null_guy]

hmmm that's not the problem, there are 2 devices
- modem
- ADSL modem

Both have been detected...

i think the problem lies in the creation of a new instance of packets when the method display_packets() is called. Have you been able to try the code???
i'm using eclipse.

[jaison.ronald]

Hi Friends

Here the new and complete information about Connecting Gui Application

http://quick-help.net/connecting-gui--application

[null_guy]

elo guys, i was able to enter the captured packets in a table. just got a little problem....the table rows is not updated each time a row is inserted that is when a packet is captured..

[Hack]

Do you refresh the table?

[null_guy]

well how i do refresh the table.!!
i have tried several methods (eg fireTableDataChanged() ) but truely i dont know how to use the methods in the AbstractTableModel class!!