Serial Port Communication

  To: comp.lang.java.gui
I am trying to read data off a serial port and then display the data
in a GUI and I cannot seem to access the GUI in order to do this. For
some reason whenever I try to append to the text box the program seems
to stall out and I cannot figure out why? Any help would be
appreciated, thanks!!

import java.io.*;
import java.util.*;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

import gnu.io.*;

public class Data implements Runnable, SerialPortEventListener{
    static CommPortIdentifier portId;
    static Enumeration portList;
    InputStream inputStream;
    SerialPort serialPort;
    Thread readThread;
    static Shell shell;
    static Display dispMain;
    static Text txtOutput;

    /**
     * Method declaration
     *
     *
     * @param args
     *
     * @see
     */
    public static void main(String[] args) {
        boolean portFound = false;
        String defaultPort;

        if (args.length > 0) {
            defaultPort = args[0];
        }

        buildGUI();

        portList = CommPortIdentifier.getPortIdentifiers();

        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                if (portId.getName().equals(defaultPort)) {
                    System.out.println("Found port: "+defaultPort);
                    portFound = true;
                    Data reader = new Data();
                }
            }
        }
        if (!portFound) {
            System.out.println("port " + defaultPort + " not found.");
        }

        while (!shell.isDisposed())
        {
            if (!dispMain.readAndDispatch()) dispMain.sleep();
        }
    }

    /**
     * Constructor declaration
     *
     *
     * @see
     */
    public Data() {
        try {
            serialPort = (SerialPort) portId.open("SimpleReadApp", 2000);
        } catch (PortInUseException e) {}

        try {
            inputStream = serialPort.getInputStream();
        } catch (IOException e) {}

        try {
            serialPort.addEventListener(this);
        } catch (TooManyListenersException e) {}

        serialPort.notifyOnDataAvailable(true);

        try {
            serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8,
                    SerialPort.STOPBITS_1,
                    SerialPort.PARITY_NONE);
        } catch (UnsupportedCommOperationException e) {}

        readThread = new Thread(this);

        readThread.start();

    }

    /**
     * Method declaration
     *
     *
     * @see
     */
    public void run() {
        try {
            Thread.sleep(20000);
        } catch (InterruptedException e) {}
    }

    public static void buildGUI()
    {
        dispMain = new Display();
        shell = new Shell(dispMain);

        shell.setText("Parking Meter Test Bench Data");
        shell.setSize(800,600);
        shell.open();

        txtOutput = new Text(shell, SWT.BORDER | SWT.H_SCROLL |
SWT.V_SCROLL);
        txtOutput.setBounds(10,90,200,200);
        txtOutput.setEditable(false);
        txtOutput.setText("Test Text\n");
        txtOutput.append("Hello World");
        txtOutput.append("Hello Look at Me");
        txtOutput.setLocation(10, 150);

    }

    /**
     * Method declaration
     *
     *
     * @param event
     *
     * @see
     */
    public void serialEvent(SerialPortEvent event) {
        switch (event.getEventType()) {

        case SerialPortEvent.BI:

        case SerialPortEvent.OE:

        case SerialPortEvent.FE:

        case SerialPortEvent.PE:

        case SerialPortEvent.CD:

        case SerialPortEvent.CTS:

        case SerialPortEvent.DSR:

        case SerialPortEvent.RI:

        case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
            break;

        case SerialPortEvent.DATA_AVAILABLE:
            byte[] readBuffer = new byte[20];

            try {
                while (inputStream.available() > 0) {
                    int numBytes = inputStream.read(readBuffer);
                    System.out.println("1233433423423");
                }

                System.out.print(new String(readBuffer));
                txtOutput.append(new String(readBuffer));

            } catch (IOException e) {}

            break;
        }
    }

}

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