Dumping a file

**havinFun** · April 27th, 2012, 09:52 PM

OK, I am creating a dump that prints out into a new file in hexadecimal format. I have written some code, but I am getting the wrong output. In the ActionListener (dump) button I am having trouble connecting a formatDump method which takes an int array and an int address as arguments. An then there is another method called hex2Str that has two arguments, one int that converts to hexadecimal and an int that determines the number of digits. How am I to connect both of these methods to print out into a new file using a button?

import java.awt.Color;
 
 
public class Week03 {
 
	private JFrame frame;
	private final JLabel lblNewLabel = new JLabel("@ ! @ Hex Dump @ ! @");
	private final JLabel lblInstructions = new JLabel("Hex Dump program that " +
			"will read a file and save the data that has been converted to " +
			"hexadecimal form in a new file.");
	private final JLabel lblFind = new JLabel("Find the following file:");
	private final JTextField txtFind = new JTextField();
	private final JButton btnFind = new JButton("Find");
	private final JLabel lblSave = new JLabel("Save the following file:");
	private final JTextField txtSave = new JTextField();
	private final JButton btnSave = new JButton("Save");
	private final JButton btnDump = new JButton("DUMP");
	private static final int[] HEXARR = [hexStr];
 
	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					Week03 window = new Week03();
					window.frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}
 
	/**
	 * Create the application.
	 */
	public Week03() {
		initialize();
	}
 
	/**
	 * Initialize the contents of the frame.
	 */
	private void initialize() {
		txtFind.setFont(new Font("Andy", Font.PLAIN, 14));
		txtFind.setBounds(10, 107, 589, 32);
		txtFind.setColumns(10);
		frame = new JFrame();
		frame.setTitle("Belinda Frederick - Week03");
		frame.setBackground(new Color(70, 130, 180));
		frame.setBounds(100, 100, 715, 303);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.getContentPane().setLayout(null);
		lblNewLabel.setForeground(new Color(46, 139, 87));
		lblNewLabel.setHorizontalAlignment(SwingConstants.CENTER);
		lblNewLabel.setFont(new Font("Fine Hand", Font.BOLD, 30));
		lblNewLabel.setBounds(10, 11, 679, 50);
 
		** bunch of code here **
 
		frame.getContentPane().add(txtFind);
		btnFind.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				JFileChooser jfc = new JFileChooser();
				int inFile = jfc.showOpenDialog(null);
				if(inFile == JFileChooser.APPROVE_OPTION) {
					txtFind.setText(
							jfc.getSelectedFile().getAbsolutePath());
				}
				txtSave.setText(txtFind.getText() + ".dmp");
			}
		});
		btnFind.setForeground(new Color(248, 248, 255));
		btnFind.setBackground(new Color(139, 0, 0));
		btnFind.setFont(new Font("Batang", Font.BOLD, 14));
		btnFind.setBounds(610, 109, 79, 30);
 
		txtSave.setFont(new Font("Andy", Font.PLAIN, 14));
		txtSave.setColumns(10);
		txtSave.setBounds(10, 175, 589, 32);
 
		frame.getContentPane().add(txtSave);
		btnSave.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				JFileChooser jfc = new JFileChooser();
				int inFile = jfc.showSaveDialog(null);
				if(inFile == JFileChooser.APPROVE_OPTION) {
					txtSave.setText(
							jfc.getSelectedFile().getAbsolutePath());
				}
			}
		});
		btnSave.setForeground(new Color(248, 248, 255));
		btnSave.setFont(new Font("Batang", Font.BOLD, 14));
		btnSave.setBackground(new Color(139, 0, 0));
		btnSave.setBounds(610, 177, 79, 30);
 
		frame.getContentPane().add(btnSave);
		btnDump.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String inStr = txtFind.getText();
				String outStr = txtSave.getText();
				//String hexData = null;
				FileInputStream fis = null;
				PrintWriter pw = null;
				try {
					fis = new FileInputStream(inStr);
					pw = new PrintWriter(outStr);
 
					int k;
					byte[] buffer = new byte[16];
					while((k = fis.read(buffer)) != -1) {
						for(int i = 0; i < k; i++) {
							int j = buffer[i];
							if(j < 0) j += 256;
							pw.print(HEXARR);
						}
						pw.printf("\n");
					}
				} catch (Exception fe) {
 
				} finally {
					if(fis != null) {
						try {
							fis.close();
						} catch (IOException e_a) {
							e_a.printStackTrace();
						}
					} if(pw != null) {
						pw.close();
					}
				}
				JOptionPane.showMessageDialog(null, "The hex dump is " +
						"complete.");
			}
		});	}
 
	public static String formatDump(int address, int[] hexArr) {
		String hexStr = "";
		address = hexArr.length;
		for(int i = 0; i < address; i ++) {
			if((hexArr[i] > 32) && (hexArr[i] < 127) || (hexArr[i] > 160)) {
				hexStr += hexArr + "  ";
			} else {
				hexStr += "\n";
			}
		}
		return hexStr;
 
		/**char[] hexChar = "0123456789ABCDEF".toCharArray();
		address = 
				8
				+ 3;
		int firstHex = address;
		int fd = (address - 8)/4;
 
		for(int i = fd; i < address; i++) {
			if((hexArr[i] > 32) && (hexArr[i] < 127) || (hexArr[i] > 160)) {
				hexStr += hexArr[i];
			} else {
				hexStr += ".";
			}
		}
		int i = 0;
		String hexStr = "";
		StringBuffer sb = new StringBuffer(hexStr);
		do {
			for(int j = 0; j < hexArr.length; j++) {
 
				i += address;
			}
		} while (i < hexArr.length);
		int[] hexArr2 = new int[i];
		return sb.toString();*/
	}
 
	public String hex2Str(int convert, int numDigit) {
		StringBuilder strBldr = new StringBuilder(Integer.toString(convert, 16));
		if(strBldr.length() < numDigit) {
			int hex = (numDigit - strBldr.length());
			for(int i = 0; i <= hex; i++) {
				strBldr.insert(0, "0");
			}
		} else if(strBldr.length() > numDigit) {
			strBldr = new StringBuilder();
			for(int i = 1; i <= numDigit; i++) {
				strBldr.append(".");
			}
		}
		/**
		//String str = String.format("%08x", Integer.valueOf(numDigit));
		//String hexStr = "";
		int num = 0;
		for(int i = convert; i < convert + numDigit; i++) {
			num = (convert >> 4 * (numDigit - i - 1)) & 0x0f;
			//str = Integer.toString(num + 0x100, 16).substring(i);
		}
		return (HEXARR[num]);*/
		return strBldr.toString();
 
 
 
	}
}

Here is what I am outputting:

nullnullnullnullnullnullnullnullnullnullnullnullnull

**Norm** · April 28th, 2012, 06:52 AM

Your posted code does not compile. Either fix the compiler errors or post the full text of the error messages you need help fixing.

**havinFun** · April 28th, 2012, 01:25 PM

Here is the complete code:

import java.awt.Color;
 
 
public class Week03 {
 
	private JFrame frame;
	private final JLabel lblNewLabel = new JLabel("@ ! @ Hex Dump @ ! @");
	private final JLabel lblInstructions = new JLabel("Hex Dump program that " +
			"will read a file and save the data that has been converted to " +
			"hexadecimal form in a new file.");
	private final JLabel lblFind = new JLabel("Find the following file:");
	private final JTextField txtFind = new JTextField();
	private final JButton btnFind = new JButton("Find");
	private final JLabel lblSave = new JLabel("Save the following file:");
	private final JTextField txtSave = new JTextField();
	private final JButton btnSave = new JButton("Save");
	private final JButton btnDump = new JButton("DUMP");
	private static final int[] HEXARR = null;;
 
	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					Week03 window = new Week03();
					window.frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}
 
	/**
	 * Create the application.
	 */
	public Week03() {
		initialize();
	}
 
	/**
	 * Initialize the contents of the frame.
	 */
	private void initialize() {
		txtFind.setFont(new Font("Andy", Font.PLAIN, 14));
		txtFind.setBounds(10, 107, 589, 32);
		txtFind.setColumns(10);
		frame = new JFrame();
		frame.setTitle("Belinda Frederick - Week03");
		frame.setBackground(new Color(70, 130, 180));
		frame.setBounds(100, 100, 715, 303);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.getContentPane().setLayout(null);
		lblNewLabel.setForeground(new Color(46, 139, 87));
		lblNewLabel.setHorizontalAlignment(SwingConstants.CENTER);
		lblNewLabel.setFont(new Font("Fine Hand", Font.BOLD, 30));
		lblNewLabel.setBounds(10, 11, 679, 50);
 
		frame.getContentPane().add(lblNewLabel);
		lblInstructions.setForeground(new Color(139, 0, 0));
		lblInstructions.setHorizontalAlignment(SwingConstants.CENTER);
		lblInstructions.setFont(new Font("Corbel", Font.BOLD, 13));
		lblInstructions.setBounds(10, 60, 679, 25);
 
		frame.getContentPane().add(lblInstructions);
		lblFind.setForeground(new Color(46, 139, 87));
		lblFind.setFont(new Font("Harrington", Font.BOLD, 14));
		lblFind.setBounds(10, 82, 227, 25);
 
		frame.getContentPane().add(lblFind);
 
		frame.getContentPane().add(txtFind);
		btnFind.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				JFileChooser jfc = new JFileChooser();
				int inFile = jfc.showOpenDialog(null);
				if(inFile == JFileChooser.APPROVE_OPTION) {
					txtFind.setText(
							jfc.getSelectedFile().getAbsolutePath());
				}
				txtSave.setText(txtFind.getText() + ".dmp");
			}
		});
		btnFind.setForeground(new Color(248, 248, 255));
		btnFind.setBackground(new Color(139, 0, 0));
		btnFind.setFont(new Font("Batang", Font.BOLD, 14));
		btnFind.setBounds(610, 109, 79, 30);
 
		frame.getContentPane().add(btnFind);
		lblSave.setForeground(new Color(46, 139, 87));
		lblSave.setFont(new Font("Harrington", Font.BOLD, 14));
		lblSave.setBounds(10, 151, 227, 25);
 
		frame.getContentPane().add(lblSave);
		txtSave.setFont(new Font("Andy", Font.PLAIN, 14));
		txtSave.setColumns(10);
		txtSave.setBounds(10, 175, 589, 32);
 
		frame.getContentPane().add(txtSave);
		btnSave.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				JFileChooser jfc = new JFileChooser();
				int inFile = jfc.showSaveDialog(null);
				if(inFile == JFileChooser.APPROVE_OPTION) {
					txtSave.setText(
							jfc.getSelectedFile().getAbsolutePath());
				}
			}
		});
		btnSave.setForeground(new Color(248, 248, 255));
		btnSave.setFont(new Font("Batang", Font.BOLD, 14));
		btnSave.setBackground(new Color(139, 0, 0));
		btnSave.setBounds(610, 177, 79, 30);
 
		frame.getContentPane().add(btnSave);
		btnDump.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String inStr = txtFind.getText();
				String outStr = txtSave.getText();
				//String hexData = null;
				FileInputStream fis = null;
				PrintWriter pw = null;
				try {
					fis = new FileInputStream(inStr);
					pw = new PrintWriter(outStr);
 
					int k;
					byte[] buffer = new byte[16];
					while((k = fis.read(buffer)) != -1) {
						for(int i = 0; i < k; i++) {
							int j = buffer[i];
							if(j < 0) j += 256;
							pw.print(HEXARR);
						}
						pw.printf("\n");
					}
				} catch (Exception fe) {
 
				} finally {
					if(fis != null) {
						try {
							fis.close();
						} catch (IOException e_a) {
							e_a.printStackTrace();
						}
					} if(pw != null) {
						pw.close();
					}
				}
				JOptionPane.showMessageDialog(null, "The hex dump is " +
						"complete.");
			}
		});
		btnDump.setForeground(new Color(248, 248, 255));
		btnDump.setBackground(new Color(46, 139, 87));
		btnDump.setFont(new Font("Fine Hand", Font.BOLD, 18));
		btnDump.setBounds(280, 222, 133, 32);
 
		frame.getContentPane().add(btnDump);
	}
 
	public static String formatDump(int address, int[] hexArr) {
		String hexStr = "";
		address = hexArr.length;
		for(int i = 0; i < address; i ++) {
			if((hexArr[i] > 32) && (hexArr[i] < 127) || (hexArr[i] > 160)) {
				hexStr += hexArr + "  ";
			} else {
				hexStr += "\n";
			}
		}
		return hexStr;
 
		/**char[] hexChar = "0123456789ABCDEF".toCharArray();
		address = 
				8
				+ 3;
		int firstHex = address;
		int fd = (address - 8)/4;
 
		for(int i = fd; i < address; i++) {
			if((hexArr[i] > 32) && (hexArr[i] < 127) || (hexArr[i] > 160)) {
				hexStr += hexArr[i];
			} else {
				hexStr += ".";
			}
		}
		int i = 0;
		String hexStr = "";
		StringBuffer sb = new StringBuffer(hexStr);
		do {
			for(int j = 0; j < hexArr.length; j++) {
 
				i += address;
			}
		} while (i < hexArr.length);
		int[] hexArr2 = new int[i];
		return sb.toString();*/
	}
 
	public String hex2Str(int convert, int numDigit) {
		StringBuilder strBldr = new StringBuilder(Integer.toString(convert, 16));
		if(strBldr.length() < numDigit) {
			int hex = (numDigit - strBldr.length());
			for(int i = 0; i <= hex; i++) {
				strBldr.insert(0, "0");
			}
		} else if(strBldr.length() > numDigit) {
			strBldr = new StringBuilder();
			for(int i = 1; i <= numDigit; i++) {
				strBldr.append(".");
			}
		}
		/**
		//String str = String.format("%08x", Integer.valueOf(numDigit));
		//String hexStr = "";
		int num = 0;
		for(int i = convert; i < convert + numDigit; i++) {
			num = (convert >> 4 * (numDigit - i - 1)) & 0x0f;
			//str = Integer.toString(num + 0x100, 16).substring(i);
		}
		return (HEXARR[num]);*/
		return strBldr.toString();
 
 
 
	}
}

I just compiled/ran this one and get the nullnullnull output. I realize that I am getting a null pointer, but I am supposed to be getting something like this:

00000000 50 4b 03 04 14 00 08 00  08 00 37 62 4c 3c 00 08 PK........7b<..

So I guess I am having issues with my formatDump method, it appears that I need to somehow call the method in the actionPerformed for the Dump button and I also need to call the hex2Str method in the same actionPerformed. The only problem, I don't think that I have these methods set up correctly. Can you please also look at these methods and let me know if I am on the right track. Thank you

**Norm** · April 28th, 2012, 01:35 PM

I get many compiler errors because of missing import statements.

**havinFun** · April 28th, 2012, 01:50 PM

sorry here is the entire code:

import java.awt.Color;
import java.awt.EventQueue;
 
import javax.swing.JFrame;
import javax.swing.JLabel;
import java.awt.Font;
 
import javax.swing.JFileChooser;
import javax.swing.JOptionPane;
import javax.swing.SwingConstants;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintWriter;
 
 
public class Week03 {
 
	private JFrame frame;
	private final JLabel lblNewLabel = new JLabel("@ ! @ Hex Dump @ ! @");
	private final JLabel lblInstructions = new JLabel("Hex Dump program that " +
			"will read a file and save the data that has been converted to " +
			"hexadecimal form in a new file.");
	private final JLabel lblFind = new JLabel("Find the following file:");
	private final JTextField txtFind = new JTextField();
	private final JButton btnFind = new JButton("Find");
	private final JLabel lblSave = new JLabel("Save the following file:");
	private final JTextField txtSave = new JTextField();
	private final JButton btnSave = new JButton("Save");
	private final JButton btnDump = new JButton("DUMP");
	private static final int[] HEXARR = null;;
 
	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					Week03 window = new Week03();
					window.frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}
 
	/**
	 * Create the application.
	 */
	public Week03() {
		initialize();
	}
 
	/**
	 * Initialize the contents of the frame.
	 */
	private void initialize() {
		txtFind.setFont(new Font("Andy", Font.PLAIN, 14));
		txtFind.setBounds(10, 107, 589, 32);
		txtFind.setColumns(10);
		frame = new JFrame();
		frame.setTitle("Belinda Frederick - Week03");
		frame.setBackground(new Color(70, 130, 180));
		frame.setBounds(100, 100, 715, 303);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.getContentPane().setLayout(null);
		lblNewLabel.setForeground(new Color(46, 139, 87));
		lblNewLabel.setHorizontalAlignment(SwingConstants.CENTER);
		lblNewLabel.setFont(new Font("Fine Hand", Font.BOLD, 30));
		lblNewLabel.setBounds(10, 11, 679, 50);
 
		frame.getContentPane().add(lblNewLabel);
		lblInstructions.setForeground(new Color(139, 0, 0));
		lblInstructions.setHorizontalAlignment(SwingConstants.CENTER);
		lblInstructions.setFont(new Font("Corbel", Font.BOLD, 13));
		lblInstructions.setBounds(10, 60, 679, 25);
 
		frame.getContentPane().add(lblInstructions);
		lblFind.setForeground(new Color(46, 139, 87));
		lblFind.setFont(new Font("Harrington", Font.BOLD, 14));
		lblFind.setBounds(10, 82, 227, 25);
 
		frame.getContentPane().add(lblFind);
 
		frame.getContentPane().add(txtFind);
		btnFind.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				JFileChooser jfc = new JFileChooser();
				int inFile = jfc.showOpenDialog(null);
				if(inFile == JFileChooser.APPROVE_OPTION) {
					txtFind.setText(
							jfc.getSelectedFile().getAbsolutePath());
				}
				txtSave.setText(txtFind.getText() + ".dmp");
			}
		});
		btnFind.setForeground(new Color(248, 248, 255));
		btnFind.setBackground(new Color(139, 0, 0));
		btnFind.setFont(new Font("Batang", Font.BOLD, 14));
		btnFind.setBounds(610, 109, 79, 30);
 
		frame.getContentPane().add(btnFind);
		lblSave.setForeground(new Color(46, 139, 87));
		lblSave.setFont(new Font("Harrington", Font.BOLD, 14));
		lblSave.setBounds(10, 151, 227, 25);
 
		frame.getContentPane().add(lblSave);
		txtSave.setFont(new Font("Andy", Font.PLAIN, 14));
		txtSave.setColumns(10);
		txtSave.setBounds(10, 175, 589, 32);
 
		frame.getContentPane().add(txtSave);
		btnSave.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				JFileChooser jfc = new JFileChooser();
				int inFile = jfc.showSaveDialog(null);
				if(inFile == JFileChooser.APPROVE_OPTION) {
					txtSave.setText(
							jfc.getSelectedFile().getAbsolutePath());
				}
			}
		});
		btnSave.setForeground(new Color(248, 248, 255));
		btnSave.setFont(new Font("Batang", Font.BOLD, 14));
		btnSave.setBackground(new Color(139, 0, 0));
		btnSave.setBounds(610, 177, 79, 30);
 
		frame.getContentPane().add(btnSave);
		btnDump.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String inStr = txtFind.getText();
				String outStr = txtSave.getText();
				//String hexData = null;
				FileInputStream fis = null;
				PrintWriter pw = null;
				try {
					fis = new FileInputStream(inStr);
					pw = new PrintWriter(outStr);
 
					int k;
					byte[] buffer = new byte[16];
					while((k = fis.read(buffer)) != -1) {
						for(int i = 0; i < k; i++) {
							int j = buffer[i];
							if(j < 0) j += 256;
							pw.print(HEXARR);
						}
						pw.printf("\n");
					}
				} catch (Exception fe) {
 
				} finally {
					if(fis != null) {
						try {
							fis.close();
						} catch (IOException e_a) {
							e_a.printStackTrace();
						}
					} if(pw != null) {
						pw.close();
					}
				}
				JOptionPane.showMessageDialog(null, "The hex dump is " +
						"complete.");
			}
		});
		btnDump.setForeground(new Color(248, 248, 255));
		btnDump.setBackground(new Color(46, 139, 87));
		btnDump.setFont(new Font("Fine Hand", Font.BOLD, 18));
		btnDump.setBounds(280, 222, 133, 32);
 
		frame.getContentPane().add(btnDump);
	}
 
	public static String formatDump(int address, int[] hexArr) {
		String hexStr = "";
		address = hexArr.length;
		for(int i = 0; i < address; i ++) {
			if((hexArr[i] > 32) && (hexArr[i] < 127) || (hexArr[i] > 160)) {
				hexStr += hexArr + "  ";
			} else {
				hexStr += "\n";
			}
		}
		return hexStr;
 
		/**char[] hexChar = "0123456789ABCDEF".toCharArray();
		address = 
				8
				+ 3;
		int firstHex = address;
		int fd = (address - 8)/4;
 
		for(int i = fd; i < address; i++) {
			if((hexArr[i] > 32) && (hexArr[i] < 127) || (hexArr[i] > 160)) {
				hexStr += hexArr[i];
			} else {
				hexStr += ".";
			}
		}
		int i = 0;
		String hexStr = "";
		StringBuffer sb = new StringBuffer(hexStr);
		do {
			for(int j = 0; j < hexArr.length; j++) {
 
				i += address;
			}
		} while (i < hexArr.length);
		int[] hexArr2 = new int[i];
		return sb.toString();*/
	}
 
	public String hex2Str(int convert, int numDigit) {
		StringBuilder strBldr = new StringBuilder(Integer.toString(convert, 16));
		if(strBldr.length() < numDigit) {
			int hex = (numDigit - strBldr.length());
			for(int i = 0; i <= hex; i++) {
				strBldr.insert(0, "0");
			}
		} else if(strBldr.length() > numDigit) {
			strBldr = new StringBuilder();
			for(int i = 1; i <= numDigit; i++) {
				strBldr.append(".");
			}
		}
		/**
		//String str = String.format("%08x", Integer.valueOf(numDigit));
		//String hexStr = "";
		int num = 0;
		for(int i = convert; i < convert + numDigit; i++) {
			num = (convert >> 4 * (numDigit - i - 1)) & 0x0f;
			//str = Integer.toString(num + 0x100, 16).substring(i);
		}
		return (HEXARR[num]);*/
		return strBldr.toString();
 
 
 
	}
}

**Norm** · April 28th, 2012, 01:59 PM

Have you looked at the variable that you are printing to the file?

For testing change the program so everything is in the program with no need to read or write disk files. Use ByteArray streams so you can print them from the program and see the results immediately in the program.

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