Reading RS232 and displaying contents on Frame

[Fernando Hood]

I having difficulty tying the serial port class to the UI and displaying its data. I was able to do this in vb relatively easily...

 
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 * and open the template in the editor.
 */
 
package my.numberaddittion;
 
/**
 *
 * @author fernando.hood
 */
 

import java.io.*;
import java.util.*;
import javax.comm.*;
 
public class SerialPortController implements Runnable, SerialPortEventListener {
 
    static CommPortIdentifier portId;
  
 
    private InputStream inputStream;
    private SerialPort serialPort;
    private Thread readThread;
    
    public int byteRead;
 

    /**
     * Constructor declaration
     *
     *
     * @see
     */
    public SerialPortController( CommPortIdentifier  comm) {
        
        portId = comm;
        
        try {
            serialPort = (SerialPort) portId.open("MainApp", 1000);
        } catch (PortInUseException e) {
        }
 
        try {
            inputStream = serialPort.getInputStream();
        } catch (IOException e) {
        }
 
        try {
            serialPort.addEventListener(this);
        } catch (TooManyListenersException e) {
        }
 
        serialPort.notifyOnDataAvailable(true);
 
        try {
            serialPort.setSerialPortParams(115200, 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(10);
        } catch (InterruptedException e) {
        }
    }
 
    /**
     * 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:
 

                try {
                    while (inputStream.available() > 0) {
                        byteRead = inputStream.read();
                        System.out.print(byteRead);
                    }
                    System.out.println("--------------");
 
                } catch (IOException e) {
                }
 
                break;
        }
    }
}   

 
 * NumberAdditionUI.java
 *
 * Created on April 30, 2008, 12:20 PM
 */
 
package my.numberaddittion;
 
/**
 *
 * @author  fernando.hood
 */
 
import java.io.*;
import javax.comm.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Enumeration;
 
public class NumberAdditionUI extends javax.swing.JFrame {
 
    private String [] CommsArray = new String [5];
    private int CommArrayIndex;
    private String selectedBaud;
    private String selectedComm;
    private String defaultPort;
    static int drumticks;   
    
    
    /** Creates new form NumberAdditionUI */
    public NumberAdditionUI() {
        initComponents();
                
        getPortNames();
        jComboBoxCommSelect.setModel(new javax.swing.DefaultComboBoxModel(CommsArray));
    }
 
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {
 
        jButton3 = new javax.swing.JButton();
        jPanel1 = new javax.swing.JPanel();
        jTextField1 = new javax.swing.JTextField();
        jTextField2 = new javax.swing.JTextField();
        jTextField3 = new javax.swing.JTextField();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jButton2 = new javax.swing.JButton();
        jButton1 = new javax.swing.JButton();
        jComboBoxCommSelect = new javax.swing.JComboBox();
        jComboBoxBaudRate = new javax.swing.JComboBox();
 
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
 
        jButton3.setText("Exit");
        jButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton3ActionPerformed(evt);
            }
        });
 
        jPanel1.setBorder(new javax.swing.border.MatteBorder(null));
 
        jTextField3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField3ActionPerformed(evt);
            }
        });
 
        jLabel1.setText("First number");
 
        jLabel2.setText("Second Number");
 
        jLabel3.setText("Result");
 
        jButton2.setText("add");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });
 
        jButton1.setText("Clear");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });
 
        jComboBoxCommSelect.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Com1", "Com2", "Com3" }));
        jComboBoxCommSelect.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jComboBoxCommSelectActionPerformed(evt);
            }
        });
 
        jComboBoxBaudRate.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "9600", "14400", "19200", "28800", "38400", "57600" }));
        jComboBoxBaudRate.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jComboBoxBaudRateActionPerformed(evt);
            }
        });
 
        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jComboBoxCommSelect, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(jLabel1)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 218, Short.MAX_VALUE)
                        .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 83, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel2)
                            .addComponent(jLabel3)
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addGap(18, 18, 18)
                                .addComponent(jComboBoxBaudRate, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
                        .addGap(144, 144, 144)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                            .addComponent(jTextField3, javax.swing.GroupLayout.DEFAULT_SIZE, 142, Short.MAX_VALUE)
                            .addGroup(javax.swing.GroupLayout.Alignment.LEADING, jPanel1Layout.createSequentialGroup()
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 12, Short.MAX_VALUE)
                                .addComponent(jButton1)
                                .addGap(18, 18, 18)
                                .addComponent(jButton2))
                            .addComponent(jTextField2, javax.swing.GroupLayout.DEFAULT_SIZE, 142, Short.MAX_VALUE))))
                .addGap(411, 411, 411))
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(227, 227, 227)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(18, 18, 18)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(28, 28, 28)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel3)
                    .addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 44, Short.MAX_VALUE)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton2)
                    .addComponent(jComboBoxCommSelect, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jComboBoxBaudRate, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jButton1)))
        );
 
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(675, Short.MAX_VALUE)
                .addComponent(jButton3)
                .addGap(135, 135, 135))
            .addGroup(layout.createSequentialGroup()
                .addGap(22, 22, 22)
                .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addGap(18, 18, 18)
                .addComponent(jButton3)
                .addContainerGap())
        );
 
        pack();
    }// </editor-fold>                        
private void getPortNames()
{
    
    Enumeration ports;
    
    System.out.println("Verifying Comm Build Environment");
 
    try
    {
        ports = CommPortIdentifier.getPortIdentifiers();
        if (ports == null)
            {
            System.out.println("No comm ports found!");
            return;
            }
        System.out.println("Some ports appear to have been found, let's try to ");
 
        CommArrayIndex = 0;
                
        while (ports.hasMoreElements())
            {
            
            CommsArray[CommArrayIndex]= ((CommPortIdentifier)ports.nextElement()).getName();
           
            
             CommArrayIndex++;
            
            }
    } catch (Exception e)
        {
        System.out.println("Failed to enumerate ports [" + e.getMessage() + "]");
        e.printStackTrace();
        }
}
    public void selectport(String commsel) {
        
        boolean portFound = false;
        defaultPort = commsel;
        Enumeration portList;
        CommPortIdentifier portId;
 
    
 
        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;
                    reader = new SerialPortController(portId);
                }
 
            }
        }
 
        if (!portFound) {
            System.out.println("port " + defaultPort + " not found.");
        }
 
    }
    
private void jTextField3ActionPerformed(java.awt.event.ActionEvent evt) {                                            
// TODO add your handling code here:
}                                           
 
private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    System.exit(0);
}                                        
 
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    jTextField1.setText("");
    jTextField2.setText("");
    jTextField3.setText("");
}                                        
 
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    // First we define float variables.
    float num1, num2, result;
    // We have to parse the text to a type float.
    num1 = Float.parseFloat(jTextField1.getText());
    num2 = Float.parseFloat(jTextField2.getText());
    // Now we can perform the addition.
    result = num1+num2;
    // We will now pass the value of result to jTextField3.
    // At the same time, we are going to
    // change the value of result from a float to a string.
    jTextField3.setText(String.valueOf(result));
}                                        
 
private void jComboBoxCommSelectActionPerformed(java.awt.event.ActionEvent evt) {                                                    
     selectedComm = (String)jComboBoxCommSelect.getSelectedItem();
     System.out.println("Selected Port " + selectedComm);
     selectport(selectedComm);
     
     
   
}                                                   
 
private void jComboBoxBaudRateActionPerformed(java.awt.event.ActionEvent evt) {                                                  
// TODO add your handling code here:
    selectedBaud = (String)jComboBoxBaudRate.getSelectedItem();
     System.out.println("Selected Baud " + selectedBaud);
}                                                 
 
    /**
    * @param args the command line arguments
    */
    public static void main(String args[]) {
        
 

 
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new NumberAdditionUI().setVisible(true);
               // drumticks = reader.byteRead;
               // System.out.println("Selected Port " + drumticks);
            }
        });
    }
    private static SerialPortController reader;
    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JComboBox jComboBoxBaudRate;
    private javax.swing.JComboBox jComboBoxCommSelect;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JTextField jTextField1;
    private javax.swing.JTextField jTextField2;
    private javax.swing.JTextField jTextField3;
    // End of variables declaration                   
 
}   

[Nathan Pruett]

Can you post:

What you're trying to do;

What exactly is going wrong;

The relevant code?

I understand that you're attempting to access serial ports through Swing - but this is actually two (or more) separate processes - one is to access the serial port and send/receive some data; the second is to display this data in a Swing GUI. Which part are you having problems with, and what exactly is going wrong? Are you getting any exceptions?

The code does download, compile, and run - but it seems to just be a generic "add two numbers in a Swing form" example (built through Netbeans) mashed together with some javax.comm serial port stuff. Does the "add two numbers" stuff have anything to do with your problem? (If not, why post it?) I'm not sure what I'm supposed to do with the GUI or what results I'm supposed to see.