Java

Problem : Reading and Writing of Byte[] Array Messages to Serial Comm (Serial Port RS232)

3-Oct-09 8:52

All the projects have it to find source use ctrl-f source easy right?

pohcb_sonic1-Oct-09 19:17

Re: Problem : Reading and Writing of Byte[] Array Messages to Serial Comm (Serial Port RS232)

1-Oct-09 19:17

Hi guys,

I have a problem in the following simple program of mine stated below. It's a simple program which enables the sending/receiving of messages(in bytes) from one PC to another. I'm sending the messages to Serial Comm ports R232 with Rxtcomm library.

There are two classes namely; serialCommMain and Comms.
serialCommMain is the GUI portion while Comms is the serial port comm portion.

I'm trying to send the messages over to another application in VB 6.0 in the other PC, as my other PC is using Windows 95 and unable to have java installed.
Although my other PC is able to verify that data is being sent through, the message isn't being displayed. The VB application I've created is working properly.

Kindly need help/assistance. thanks.

The code is as follows:
serialCommMain:

<br />
<small><br />
package SerialComm;<br />
import org.apache.commons.io.EndianUtils;<br />
<br />
public class serialCommMain extends JFrame{<br />
//	Menu<br />
	<br />
		int indx = 9;<br />
		static double number;<br />
		static String Ans;<br />
		//Window//<br />
		private static final long serialVersionUID = 1L;<br />
		static Container pane;<br />
	 <br />
		static Insets insets;<br />
	    <br />
		static JTabbedPane Menu = new JTabbedPane();<br />
	    <br />
		Comms C1;<br />
		   <br />
		<br />
		<br />
		//Timers<br />
	    public Timer timer;<br />
	    public int speed = 500;<br />
	   <br />
	    <br />
	    <br />
		 //Global Variables <br />
	      public  byte[] BytetxtMsg;<br />
	      public  byte[] readMsg = new byte[400];<br />
	      static JButton BtnTransmit;<br />
		  static JButton BtnPause;<br />
	      byte START_BYTE = (byte) 0xAA;<br />
	      byte Checksum;<br />
	    <br />
	      <br />
	     //Receive & Transmit Msg<br />
	     static JTextArea txtRx, txtTx;<br />
	    <br />
	     static JPanel Rx = new JPanel();<br />
	     static JPanel Tx = new JPanel();<br />
	     static TitledBorder Tx_Rx, Tx_Tx;<br />
	    <br />
	     <br />
	     //TextBox<br />
	     static JLabel lblENT, lblDEC;<br />
	     static JFormattedTextField Entry;<br />
	     static JTextField Decipher;<br />
	     static JPanel ENT = new JPanel(new BorderLayout());<br />
	     static TitledBorder D_ENT;<br />
	     <br />
	     static JPanel DEC = new JPanel(new BorderLayout());<br />
	     static TitledBorder D_DEC;<br />
 <br />
	     <br />
		public serialCommMain() {<br />
			// TODO Auto-generated constructor stub<br />
			super();<br />
			BytetxtMsg = new byte[indx];<br />
	<br />
		}<br />
		<br />
	<br />
		/**<br />
		 * @param args<br />
		 */<br />
		public static void main(String[] args) {<br />
			// TODO Auto-generated method stub<br />
			showGUI();<br />
<br />
		}<br />
		<br />
		public static void showGUI(){<br />
	        //set look and feel<br />
			<br />
			<br />
			//try {UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());} <br />
		    //catch (ClassNotFoundException e){}<br />
		   //catch (InstantiationException e) {}<br />
		   //catch (IllegalAccessException e) {}<br />
		   //catch (UnsupportedLookAndFeelException e) {}<br />
			<br />
			<br />
			<br />
			//for<br />
<br />
			//Create and set up Window<br />
			JFrame frame = new JFrame("Serial Comm.");<br />
			frame.setSize(800, 600);<br />
			frame.setLocation(150,50);<br />
			<br />
			<br />
			pane = frame.getContentPane();<br />
			insets = pane.getInsets();<br />
			pane.setLayout(null);<br />
			<br />
			<br />
			//Textareas<br />
			Tx_Rx =  BorderFactory.createTitledBorder(Tx_Rx, "Receive Message: ", TitledBorder.LEFT, <br />
	    			TitledBorder.CENTER, new Font("Verdana", Font.BOLD, 10));<br />
			<br />
			txtRx = new JTextArea(10,30);<br />
			txtRx.setEditable(false);<br />
			<br />
<br />
			Rx.add(txtRx);<br />
			Rx.setBorder(Tx_Rx);<br />
			pane.add(Rx);<br />
			<br />
			<br />
			Tx_Tx =  BorderFactory.createTitledBorder(Tx_Tx, "Transmit Message: ", TitledBorder.LEFT, <br />
	    			TitledBorder.CENTER, new Font("Verdana", Font.BOLD, 10));<br />
			<br />
			txtTx = new JTextArea(10,30);<br />
			txtTx.setEditable(false);<br />
			<br />
			<br />
			Tx.add(txtTx);<br />
			Tx.setBorder(Tx_Tx);<br />
			pane.add(Tx);<br />
			<br />
			<br />
			<br />
			//Entry<br />
			lblENT  = new JLabel("Transmit: ");<br />
			lblENT .setFont(new Font("Verdana", Font.BOLD, 10));<br />
					<br />
			D_ENT =  BorderFactory.createTitledBorder(D_ENT, "TX: ", TitledBorder.LEFT, <br />
	    			TitledBorder.CENTER, new Font("Verdana", Font.BOLD, 10));<br />
			<br />
			<br />
			Entry = new JFormattedTextField(Entry);<br />
			Entry.setValue(new Double(number));<br />
			Entry.setColumns(10);<br />
			Entry.addPropertyChangeListener("value", new ButtonListener());<br />
			<br />
			<br />
			<br />
			<br />
			ENT.add(Entry, BorderLayout.EAST);<br />
			ENT.add(lblENT, BorderLayout.WEST);<br />
			ENT.setBorder(D_ENT);<br />
			pane.add(ENT);<br />
			<br />
			<br />
			<br />
			<br />
			//Decipher<br />
			lblDEC  = new JLabel("Received: ");<br />
			lblDEC .setFont(new Font("Verdana", Font.BOLD, 10));<br />
					<br />
			D_DEC =  BorderFactory.createTitledBorder(D_DEC, "RX: ", TitledBorder.LEFT, <br />
	    			TitledBorder.CENTER, new Font("Verdana", Font.BOLD, 10));<br />
			<br />
			<br />
			Decipher = new JTextField(25);<br />
			Decipher.setEditable(false);<br />
			<br />
			DEC.add(Decipher, BorderLayout.EAST);<br />
			DEC.add(lblDEC, BorderLayout.WEST);<br />
			DEC.setBorder(D_DEC);<br />
			pane.add(DEC);<br />
			<br />
			<br />
			<br />
			//Buttons<br />
			BtnTransmit = new JButton("Transmit");<br />
			BtnTransmit.setFont(new Font("Verdana", Font.BOLD, 10));<br />
			pane.add(BtnTransmit);<br />
			BtnTransmit.addActionListener(new ButtonListener());<br />
			<br />
			BtnPause = new JButton("Pause");<br />
			BtnPause.setFont(new Font("Verdana", Font.BOLD, 10));	<br />
			pane.add(BtnPause);<br />
			BtnPause.addActionListener(new ButtonListener());<br />
			<br />
			  <br />
			<br />
			//Resolutions<br />
			Rx.setBounds(insets.left+5, insets.top+5, Rx.getPreferredSize().width, Rx.getPreferredSize().height);<br />
			Tx.setBounds(Rx.getX()+400, Rx.getY(), Tx.getPreferredSize().width, Tx.getPreferredSize().height);<br />
		    ENT.setBounds(Rx.getX(), Rx.getY()+200,  ENT.getPreferredSize().width, ENT.getPreferredSize().height);<br />
		    DEC.setBounds(Tx.getX(), Tx.getY()+200,  DEC.getPreferredSize().width, DEC.getPreferredSize().height);<br />
	    	<br />
		    BtnTransmit.setBounds(ENT.getX(), ENT.getY()+ 150, BtnTransmit.getPreferredSize().width, BtnTransmit.getPreferredSize().height);<br />
			BtnPause.setBounds(BtnTransmit.getX()+ 120, BtnTransmit.getY(), BtnPause.getPreferredSize().width, BtnPause.getPreferredSize().height);<br />
<br />
	  	  frame.addWindowListener(new WindowAdapter(){<br />
	            public void windowClosing(WindowEvent e){<br />
	               System.exit(0);   <br />
	            }<br />
	         });<br />
	  	  <br />
			//Display the Window<br />
			frame.setVisible(true);<br />
		}<br />
<br />
		<br />
	}<br />
<br />
	class ButtonListener extends serialCommMain implements ActionListener, PropertyChangeListener{<br />
	 <br />
		/**<br />
		 * <br />
		 */<br />
		private static final long serialVersionUID = 1L;<br />
<br />
		public ButtonListener(){<br />
			<br />
			<br />
			timer = new Timer();	<br />
			   <br />
			BytetxtMsg[0]= START_BYTE;<br />
		}<br />
		<br />
		 TimerTask Trx = new TimerTask(){<br />
<br />
<br />
				public void run() {<br />
					// TODO Auto-generated method stub<br />
					//   Display_Msg(indx);<br />
					   <br />
					  C1 = new Comms(); <br />
					  <br />
					   try{				 <br />
						  C1.sendBytes(BytetxtMsg);							<br />
					   } catch (Exception e) {<br />
			                System.err.println("ERROR: " + e.getMessage());<br />
			           }<br />
					  <br />
					   <br />
			       //     try {<br />
			                // Sleep for 10-secs<br />
			              //  Thread.sleep(10000);<br />
			    //        } catch (InterruptedException ex) {<br />
			     //       }		<br />
				}<br />
		     };<br />
		     <br />
		     <br />
		<br />
		     <br />
		<br />
			<br />
		<br />
		public void actionPerformed(ActionEvent E) {<br />
			// TODO Auto-generated method stub<br />
			Object Src = E.getSource();<br />
			<br />
							<br />
				<br />
				<br />
			<br />
			<br />
			if (Src == BtnTransmit){<br />
				<br />
				timer.scheduleAtFixedRate(Trx, 100, speed);<br />
				<br />
				number = ((Number)Entry.getValue()).doubleValue();<br />
					<br />
				System.out.println(number);<br />
				EndianUtils.writeSwappedDouble(BytetxtMsg, 2, reverse(number));<br />
			}	<br />
		}<br />
		<br />
		public static double reverse(double x) {<br />
	        ByteBuffer bbuf = ByteBuffer.allocate(8);<br />
	        bbuf.order(ByteOrder.LITTLE_ENDIAN);<br />
	        bbuf.putDouble(x);<br />
	        bbuf.order(ByteOrder.BIG_ENDIAN);<br />
	        return bbuf.getDouble(0);<br />
	    }<br />
		public void propertyChange(PropertyChangeEvent Evt) {<br />
			// TODO Auto-generated method stub<br />
	 <br />
	<br />
			}	<br />
			<br />
	}	<br />
		</small>

Comms:

<br />
<small><br />
<br />
package SerialComm;<br />
<br />
public class Comms extends serialCommMain implements SerialPortEventListener {<br />
private CommPortIdentifier commPortId;<br />
    private SerialPort serialPort;<br />
    private OutputStream outStream;<br />
    private InputStream inStream;<br />
    private byte[] readBuffer = new byte[400];<br />
    int SIZE;   <br />
    String S;<br />
    int DisplayLen = 0;<br />
    public Comms(){<br />
    	<br />
    	super();<br />
    	<br />
    	   try{<br />
			   <br />
				 <br />
	    		 connect("COM2");<br />
		         }catch (Exception e) {<br />
		          System.err.println("ERROR: " + e.getMessage());<br />
		          <br />
		       }<br />
			  <br />
    }<br />
<br />
    public void connect(String portName) throws IOException {<br />
        try {<br />
            <br />
            // Obtain a CommPortIdentifier object for the port you want to open<br />
            commPortId = CommPortIdentifier.getPortIdentifier(portName);<br />
         <br />
<br />
            // Get the port's ownership<br />
            serialPort = (SerialPort) commPortId.open(this.getClass().getName(), 2000);<br />
           <br />
            // Set the parameters of the connection.<br />
            setSerialPortParameters();<br />
<br />
            // Open the input and output streams for the connection. If they won't<br />
            // open, close the port before throwing an exception.<br />
            outStream = serialPort.getOutputStream();<br />
            inStream = serialPort.getInputStream();<br />
            <br />
            <br />
        } catch (NoSuchPortException e) {<br />
            throw new IOException(e.getMessage());<br />
        } catch (PortInUseException e) {<br />
            throw new IOException(e.getMessage());<br />
        } catch (IOException e) {<br />
            serialPort.close();<br />
            throw e;<br />
        }<br />
       <br />
<br />
    }<br />
<br />
 public void sendBytes (byte[] bytes)<br />
  {<br />
    try<br />
    {<br />
   <br />
    	SIZE = indx;<br />
    	for(int i = 0; i< SIZE; i++){	<br />
			 //Convert converted int arrayMsg to Hex in string (16 hexa), since Java's is 32Bits in byte<br />
			S = Integer.toString(ByteConversion(bytes[i]), 16) + " ";<br />
			txtTx.append(S.toUpperCase());<br />
			DisplayLen = txtTx.getLineCount();<br />
       <br />
    	}<br />
    	<br />
    	<br />
    	txtTx.append("\n");<br />
    	<br />
    	if (DisplayLen > 8){<br />
				txtTx.setText("");<br />
			 }<br />
 <br />
    	<br />
    	outStream.write (bytes, 0, bytes.length);<br />
    }<br />
   <br />
    catch (IOException e)<br />
    {<br />
      System.out.println("IOException" + e);<br />
    }      <br />
  }<br />
 <br />
 <br />
 /* public byte[] receiveBytes(int number) <br />
  {<br />
    byte[] bytes = null;<br />
    try<br />
    {<br />
      bytes = new byte[number];<br />
      inStream.read (bytes, 0, number);<br />
    }<br />
    catch (IOException e)<br />
    {<br />
      System.out.println("IOException" + e);<br />
    }<br />
    return bytes; <br />
  }*/<br />
<br />
<br />
 <br />
    /**<br />
     * Sets the serial port parameters<br />
     */<br />
    private void setSerialPortParameters() throws IOException {<br />
        int baudRate = 9600; // 9600bps<br />
<br />
        try {<br />
            // Set serial port to 9600bps-8N1..my favourite<br />
            serialPort.setSerialPortParams(<br />
                    baudRate,<br />
                    SerialPort.DATABITS_8,<br />
                    SerialPort.STOPBITS_1,<br />
                    SerialPort.PARITY_NONE);<br />
<br />
            serialPort.setFlowControlMode(<br />
                    SerialPort.FLOWCONTROL_NONE);<br />
        } catch (UnsupportedCommOperationException ex) {<br />
            throw new IOException("Unsupported serial port parameter");<br />
        }<br />
    }<br />
    <br />
	 public int ByteConversion(byte mySignedByte){<br />
	    		<br />
	 		ByteBuffer bb = ByteBuffer.allocate(4);<br />
<br />
	 		bb.put(new byte[] {0, 0, 0, mySignedByte});<br />
<br />
	 		bb.rewind();<br />
<br />
	 		int unsignedByteVal = bb.getInt();<br />
	 		<br />
	 		return unsignedByteVal;<br />
<br />
	 	}<br />
	 <br />
<br />
<br />
    <br />
public void disconnect() {<br />
<br />
if (serialPort != null) {<br />
        try {<br />
            // close the i/o streams.<br />
            outStream.close();<br />
            inStream.close();<br />
        } catch (IOException ex) {<br />
            // don't care<br />
        }<br />
        // Close the port.<br />
        serialPort.close();<br />
        serialPort = null;<br />
    }<br />
}<br />
<br />
<br />
        private void readSerial() {<br />
        	<br />
        	 <br />
            try {<br />
                int availableBytes = inStream.available();<br />
                if (availableBytes > 0) {<br />
                    // Read the serial port<br />
                    inStream.read(readBuffer, 0, availableBytes);<br />
<br />
                    // Print it out<br />
                    txtRx.append("Received :" +<br />
                            new String(readBuffer, 0, availableBytes));<br />
                }<br />
            } catch (IOException e) {<br />
            }<br />
        }<br />
<br />
<br />
  public void serialEvent(SerialPortEvent event) {<br />
	switch (event.getEventType()) {<br />
<br />
	case SerialPortEvent.BI:<br />
<br />
	case SerialPortEvent.OE:<br />
<br />
	case SerialPortEvent.FE:<br />
<br />
	case SerialPortEvent.PE:<br />
<br />
	case SerialPortEvent.CD:<br />
<br />
	case SerialPortEvent.CTS:<br />
<br />
	case SerialPortEvent.DSR:<br />
<br />
	case SerialPortEvent.RI:<br />
<br />
	case SerialPortEvent.OUTPUT_BUFFER_EMPTY:<br />
	    break;<br />
<br />
	case SerialPortEvent.DATA_AVAILABLE:<br />
	    readSerial();<br />
<br />
	    break;<br />
	}<br />
    } <br />
<br />
    <br />
}<br />
</small>

The errors I've got:

<small><br />
<br />
1500.0 //output of value 1500 from textfield.<br />
<br />
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 9<br />
	at org.apache.commons.io.EndianUtils.writeSwappedLong(EndianUtils.java:209)<br />
	at org.apache.commons.io.EndianUtils.writeSwappedDouble(EndianUtils.java:263)<br />
	at SerialComm.ButtonListener.actionPerformed(serialCommMain.java:303)<br />
	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)<br />
	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)<br />
	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)<br />
	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)<br />
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)<br />
	at java.awt.Component.processMouseEvent(Unknown Source)<br />
	at javax.swing.JComponent.processMouseEvent(Unknown Source)<br />
	at java.awt.Component.processEvent(Unknown Source)<br />
	at java.awt.Container.processEvent(Unknown Source)<br />
	at java.awt.Component.dispatchEventImpl(Unknown Source)<br />
	at java.awt.Container.dispatchEventImpl(Unknown Source)<br />
	at java.awt.Component.dispatchEvent(Unknown Source)<br />
	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)<br />
	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)<br />
	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)<br />
	at java.awt.Container.dispatchEventImpl(Unknown Source)<br />
	at java.awt.Window.dispatchEventImpl(Unknown Source)<br />
	at java.awt.Component.dispatchEvent(Unknown Source)<br />
	at java.awt.EventQueue.dispatchEvent(Unknown Source)<br />
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)<br />
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)<br />
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)<br />
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)<br />
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)<br />
	at java.awt.EventDispatchThread.run(Unknown Source)<br />
Stable Library<br />
=========================================<br />
Native lib Version = RXTX-2.1-7<br />
Java lib Version   = RXTX-2.1-7<br />
ERROR: SerialComm.Comms<br />
ERROR: null<br />
ERROR: SerialComm.Comms<br />
ERROR: null<br />
<br />
<br />
<br />
</small>

DA: http://www.pohcbsonic.deviantart.com/
Blog: http://www.pohcbsonicx.blogspot.com/
Homepage: http://www.pohcbsonic.tripod.com/

David Skelly1-Oct-09 22:20

David Skelly

1-Oct-09 22:20

Too much code, not enough information.

What problem are you having? Do you get a compilation failure? Do you get an exception at runtime? Does it run but not do anything?

Just saying "I have a problem" is too vague. The more specific you can be, the more people will be able to help you.

Re: Problem : Reading and Writing of Byte[] Array Messages to Serial Comm (Serial Port RS232)

42774802-Oct-09 22:12

Re: Problem : Reading and Writing of Byte[] Array Messages to Serial Comm (Serial Port RS232)

2-Oct-09 22:12

Download[^]
Use winrar to get to the .jar and two .dll files
Copy the .jar to jre/lib/ext and the two .dll two jre/bin
Then I want you two run this code:

Code 1:

import gnu.io.*;

public class demo 
{
	public static void main(String[] args) 
	{
		listPorts();
	}
	static void listPorts()
    {
        java.util.Enumeration<CommPortIdentifier> portEnum = CommPortIdentifier.getPortIdentifiers();
        while ( portEnum.hasMoreElements() ) 
        {
            CommPortIdentifier portIdentifier = portEnum.nextElement();
            System.out.println(portIdentifier.getName()  +  " - " +  getPortTypeName(portIdentifier.getPortType()) );
        }        
    }
    
    static String getPortTypeName ( int portType )
    {
        switch ( portType )
        {
            case CommPortIdentifier.PORT_I2C:
                return "I2C";
            case CommPortIdentifier.PORT_PARALLEL:
                return "Parallel";
            case CommPortIdentifier.PORT_RAW:
                return "Raw";
            case CommPortIdentifier.PORT_RS485:
                return "RS485";
            case CommPortIdentifier.PORT_SERIAL:
                return "Serial";
            default:
                return "unknown type";
        }
    }
}

Code 2:

// Call getAvailableSerialPorts(); from your main method dont forget to include import java.util.*;
public static HashSet<CommPortIdentifier> getAvailableSerialPorts() {
        HashSet<CommPortIdentifier> h = new HashSet<CommPortIdentifier>();
        Enumeration thePorts = CommPortIdentifier.getPortIdentifiers();
        while (thePorts.hasMoreElements()) {
            CommPortIdentifier com = (CommPortIdentifier) thePorts.nextElement();
            switch (com.getPortType()) {
            case CommPortIdentifier.PORT_SERIAL:
                try {
                    CommPort thePort = com.open("CommUtil", 50);
                    thePort.close();
                    h.add(com);
                } catch (PortInUseException e) {
                    System.out.println("Port, "  + com.getName() + ", is in use.");
                } catch (Exception e) {
                    System.err.println("Failed to open port " +  com.getName());
                    e.printStackTrace();
                }
            }
        }
        return h;
    }

Post your results from both codes.

Good luck

pohcb_sonic3-Oct-09 4:44

Re: Problem : Reading and Writing of Byte[] Array Messages to Serial Comm (Serial Port RS232)

3-Oct-09 4:44

Ok , fellas. Let me rephrase my question.

My problem is that I can detect my ports and the connection works over the two PCs. However, when I tried to send data over to the other PC, the message being sent over looks something like "@.pp...." in my output, which is incorrect. I wanted the output to be in hex, something like
"AA BC 25 EE AC...".

Any suggestions?

DA: http://www.pohcbsonic.deviantart.com/
Blog: http://www.pohcbsonicx.blogspot.com/
Homepage: http://www.pohcbsonic.tripod.com/

pohcb_sonic3-Oct-09 4:44

Re: Problem : Reading and Writing of Byte[] Array Messages to Serial Comm (Serial Port RS232)

3-Oct-09 4:44

DA: http://www.pohcbsonic.deviantart.com/
Blog: http://www.pohcbsonicx.blogspot.com/
Homepage: http://www.pohcbsonic.tripod.com/

Richard MacCutchan3-Oct-09 5:39

Re: Problem : Reading and Writing of Byte[] Array Messages to Serial Comm (Serial Port RS232)

3-Oct-09 5:39

pohcb_sonic wrote:
the message being sent over looks something like "@.pp...." in my output

Unless you convert it to Hex before you send it then this is how it will look. I suspect you just want to view it in Hex, which menas you need to capture it first and then use software to display it as hex characters.

42774803-Oct-09 8:53

Re: Problem : Reading and Writing of Byte[] Array Messages to Serial Comm (Serial Port RS232)

3-Oct-09 8:53

import java.io.*;
import java.lang.*;

public class ByteToHexa{
  public static void main(String[] args) throws IOException{
    BufferedReader buff = new BufferedReader(new InputStreamReader(System.in));
    System.out.println("Enter the byte number:");
    byte b =(byte)6;
    String str = buff.readLine();
    int i =Integer.parseInt(str);
    String hexString = Integer.toHexString(i);
    System.out.println("Hexa is:=" + hexString);
  }
}

Does this do it?

Richard MacCutchan3-Oct-09 21:38

Re: Problem : Reading and Writing of Byte[] Array Messages to Serial Comm (Serial Port RS232)

3-Oct-09 21:38

Member 4277480 wrote:
Does this do it?

Well apart from the obvious error(s), I don't think so; but then I'm not the OP. If you read OP's previous, he/she wants to see the captured network text displayed in Hex rather than ascii characters.

42774804-Oct-09 0:10

Re: Problem : Reading and Writing of Byte[] Array Messages to Serial Comm (Serial Port RS232)

4-Oct-09 0:10

If you read the code by poster he/she is transmitting a Byte Array, for each element in that array there is a byte which is an Integer so to get the Hex of it use the code I posted above and what obvious error are you talking about and ASCII charecters??

Richard MacCutchan4-Oct-09 1:15

Re: Problem : Reading and Writing of Byte[] Array Messages to Serial Comm (Serial Port RS232)

4-Oct-09 1:15

pohcb_sonic wrote:
However, when I tried to send data over to the other PC, the message being sent over looks something like "@.pp...." in my output, which is incorrect. I wanted the output to be in hex, something like
"AA BC 25 EE AC...".

Member 4277480 posted this code:

  public static void main(String[] args) throws IOException{
    BufferedReader buff = new BufferedReader(new InputStreamReader(System.in));
    System.out.println("Enter the byte number:");
    byte b =(byte)6;
    String str = buff.readLine();
    int i =Integer.parseInt(str);
    String hexString = Integer.toHexString(i);
    System.out.println("Hexa is:=" + hexString);
  }
}

I don't see what the following statement is for:

byte b =(byte)6;

The remaining code reads some input from the console, parses it to an integer and then displays it in Hex. This is not converting the characters of the message passing between the two PCs.
Or did I miss something obvious?

42774804-Oct-09 2:40

Re: Problem : Reading and Writing of Byte[] Array Messages to Serial Comm (Serial Port RS232)

4-Oct-09 2:40

1. My bad for extra statement that does not make it an error though
2. Let me clarify:

In the previous code I am only saying that if I have a message suppose it is "hello" I want to transmit that message, the first thing I will do is convert it to a byte array and send it, then use the Integer.toHexString(i); to get the Hex of that message from every byte in that array. This in short is a simulation of what is to be done not the exact code to do it.

Richard MacCutchan4-Oct-09 4:01

Re: Problem : Reading and Writing of Byte[] Array Messages to Serial Comm (Serial Port RS232) [modified]

4-Oct-09 4:01

Member 4277480 wrote:
then use the Integer.toHexString(i); to get the Hex of that message from every byte in that array. This in short is a simulation of what is to be done not the exact code to do it.

But, as I said earlier there is an error. Your Integer.toHexString(i); statement is displaying the hex value of the index rather than the byte within the array. Something of the form Integer.toHexString(byteArray[i]); would be more useful.

pohcb_sonic4-Oct-09 17:21

Re: Problem : Reading and Writing of Byte[] Array Messages to Serial Comm (Serial Port RS232)

4-Oct-09 17:21

Ok fellas,

I have edited and updated my main Question in this thread. Pls refer to it. can kindly assist? thanks.

DA: http://www.pohcbsonic.deviantart.com/
Blog: http://www.pohcbsonicx.blogspot.com/
Homepage: http://www.pohcbsonic.tripod.com/

modified on Sunday, October 4, 2009 11:51 PM

42774804-Oct-09 22:15

Re: Problem : Reading and Writing of Byte[] Array Messages to Serial Comm (Serial Port RS232)

4-Oct-09 22:15

int indx = 9;

EndianUtils.writeSwappedDouble(BytetxtMsg, 2, reverse(number));

ByteBuffer bbuf = ByteBuffer.allocate(8);

Byte buffer is 8 and is constant i.e does not change lets call it b, so we have two variables the indx and the 2 in the endian lets call it x. The relationship would be indx = b + x; as the minimum acceptable value.

regionwar5-Oct-09 2:35

regionwar

5-Oct-09 2:35

the problem is that:
EndianUtils.writeSwappedDouble(BytetxtMsg, 2, reverse(number));

you just fix it:
EndianUtils.writeSwappedDouble(BytetxtMsg, 1, reverse(number));

Double has 8 bytes.bbuf has 9 bytes capacity and begins with index zero.But your offset is 2,so its capaticy will not be enough. it will throw out of bound exception.

Re: Problem : Reading and Writing of Byte[] Array Messages to Serial Comm (Serial Port RS232)

pohcb_sonic6-Oct-09 14:18

6-Oct-09 14:18

Ok, I've already solved the EndianUtils problem. But the following error still exists.

<small><br />
<br />
ERROR: SerialComm.Comms<br />
ERROR: null<br />
ERROR: SerialComm.Comms<br />
ERROR: null<br />
<br />
</small>

Although I did use the try and catch method to catch the above errors in my code, I still couldn't figure out why the problems exist.

<small><br />
<br />
try{<br />
<br />
<br />
connect("COM2");<br />
}catch (Exception e) {<br />
System.err.println("ERROR: " + e.getMessage()); //this is where the "ERROR: SerialComm.Comms" starts.<br />
<br />
}<br />
<br />
}<br />
<br />
<br />
try{ <br />
C1.sendBytes(BytetxtMsg); <br />
} catch (Exception e) {<br />
System.err.println("ERROR: " + e.getMessage()); //this is where the "ERROR: null" starts.<br />
<br />
}<br />
<br />
</small>

DA: http://www.pohcbsonic.deviantart.com/
Blog: http://www.pohcbsonicx.blogspot.com/
Homepage: http://www.pohcbsonic.tripod.com/

help regarding j2ee

madhu91241-Oct-09 1:24

madhu9124

1-Oct-09 1:24

hi guys,
i have learnt java beginners fundamentals and concepts,i want to learn j2ee can i learn it using books or it should be learnt only in training centers.please help me out.

Re: help regarding j2ee

Nagy Vilmos1-Oct-09 3:12

Nagy Vilmos

1-Oct-09 3:12

Sun has a lot of information; here[^].

Install netbeans and start creating.
Buy a book. Even if you decide to take a training course, buy a book it will always be useful.
Start learning the big concepts first.

97.35% of EE work is the same as SE; so don't sweat it.

Enjoy!

Panic, Chaos, Destruction.
My work here is done.

Re: help regarding j2ee

madhu91242-Oct-09 1:34

madhu9124

2-Oct-09 1:34

thanks for the information provided

Struts - tiles

sangeethanarayan30-Sep-09 21:04

sangeethanarayan

30-Sep-09 21:04

i have a web application in struts. i want to use the tiles for that application.is there any possibility?

Re: Struts - tiles

427748030-Sep-09 21:56

Sending mails by lotus notes using javascript

30-Sep-09 21:56

Yes it is and a nice guide for it Link[^]

Good luck

divya.katti30-Sep-09 20:46

divya.katti

30-Sep-09 20:46

Hi,
I tried the code given to send mails using lotus notes. I want to try the code for multiple reciepients. I tried the solution given i.e using ";" to separate the email ids. But its not working. Its not working even for cc and bcc.

Re: Sending mails by lotus notes using javascript

427748030-Sep-09 21:55