Application Screen scraping

import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.event.*;
 
public class ScreenScrapeExample
{
	private Robot robot = null;
 
	public ScreenScrapeExample() throws Exception
	{
		// Get the commands from the file
		String[] commands = loadCommands();
 
		// Open the calculator, this is windows specific
		Process child = Runtime.getRuntime().exec("calc.exe");
 
		// Instantiate the robot
		robot = new Robot();
 
		// Type the commands
		for (int i = 0; i < commands.length; i++)
		{
			String command = commands[i];
			char[] c = command.toCharArray();
			for (int j = 0; j < c.length; j++)
			{
				switch (c[j])
				{
				case '+':
					robot.keyPress(KeyEvent.VK_ADD);
					robot.keyRelease(KeyEvent.VK_ADD);
					break;
				case '-':
					robot.keyPress(KeyEvent.VK_SUBTRACT);
					robot.keyRelease(KeyEvent.VK_SUBTRACT);
					break;
				case '*':
					robot.keyPress(KeyEvent.VK_MULTIPLY);
					robot.keyRelease(KeyEvent.VK_MULTIPLY);
					break;
				case '/':
					robot.keyPress(KeyEvent.VK_DIVIDE);
					robot.keyRelease(KeyEvent.VK_DIVIDE);
					break;
				case '=':
					robot.keyPress(KeyEvent.VK_EQUALS);
					robot.keyRelease(KeyEvent.VK_EQUALS);
					break;
				default:
					robot.keyPress(c[j]);
					break;
				}
			}
 
			// now copy the answer
			robot.keyPress(KeyEvent.VK_CONTROL);
			robot.keyPress(KeyEvent.VK_C);
			robot.keyRelease(KeyEvent.VK_C);
			robot.keyRelease(KeyEvent.VK_CONTROL);
 
			// pause for 0.2s
			try
			{
				Thread.sleep(200);
			} catch (Exception e)
			{
			}
 
			// Read the answer from the clipboard
			String answer = getClipboard();
			outputAnswer(command + answer);
		}
		
		//close the calcultor using alt+f4
		robot.keyPress(KeyEvent.VK_ALT);
		robot.keyPress(KeyEvent.VK_F4);
		robot.keyRelease(KeyEvent.VK_F4);
		robot.keyRelease(KeyEvent.VK_ALT);
		
	}
 
	public void outputAnswer(String s)
	{
		// TO DO: write the answer to the output file here.
		System.out.println(s);
	}
 
	public static String getClipboard()
	{
		Transferable t = Toolkit.getDefaultToolkit().getSystemClipboard()
				.getContents(null);
		try
		{
			if (t != null && t.isDataFlavorSupported(DataFlavor.stringFlavor))
			{
				String text = (String) t
						.getTransferData(DataFlavor.stringFlavor);
 
				return text.trim();
			}
		} catch (Exception e)
		{
		}
		return "";
	}
 
	public String[] loadCommands()
	{
		// TO DO: read the commands from a file here.
		return new String[] { "3+4=", "5*6=", "8/2=" };
	}
 
	public static void main(String[] a) throws Exception
	{
		new ScreenScrapeExample();
	}
}
                                              

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