import java.io.IOException;
import java.io.OutputStream;
import java.util.Enumeration;
import javax.comm.CommPortIdentifier;
import javax.comm.PortInUseException;
import javax.comm.SerialPort;
import javax.comm.UnsupportedCommOperationException;
import javax.swing.JLabel;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * *author Taha Emara
 */
public class Serial {
    static Enumeration portList;
    static CommPortIdentifier portId;
    static String messageString = "0";
    static SerialPort serialPort;
    static OutputStream outputStream;
    
  public String ser(byte[] x , String com){
  
  
            portList = CommPortIdentifier.getPortIdentifiers();
        while (portList.hasMoreElements()) {
                      

            portId = (CommPortIdentifier) portList.nextElement();
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) 
                           

               if (portId.getName().equals(com)) {
                            

                //if (portId.getName().equals("/dev/term/a")) {
                    try {
                        serialPort = (SerialPort)
                            portId.open("SimpleWriteApp", 2000);
                    } catch (PortInUseException e) { return "Port In Use";   }
                    try {
                        outputStream = serialPort.getOutputStream();
                    } catch (IOException e) {}
                    try {
                        serialPort.setSerialPortParams(9600,
                            SerialPort.DATABITS_8,
                            SerialPort.STOPBITS_1,
                            SerialPort.PARITY_NONE);
                    } catch (UnsupportedCommOperationException e) {}
                    try {
                        outputStream.write(x);
                       
                    } catch (IOException e) {return "Failed to Send Data"; }

  }
            
  }
     return "Data Sent";
       
} // void ser
  
  
  
  public void close(){
  serialPort.close();
  
  }

}

  java.util.Enumeration<CommPortIdentifier> portEnum = CommPortIdentifier.getPortIdentifiers();
        int i = 0;
        String[] r = new String[5];

        while (portEnum.hasMoreElements() && i < 5) {
            CommPortIdentifier portIdentifier = portEnum.nextElement();

            r[i] = portIdentifier.getName();//+  " - " +  getPortTypeName(portIdentifier.getPortType()) ;


            i++;


        }

        jComboBox1.setModel(new javax.swing.DefaultComboBoxModel(r));

String x= jTextField1.getText();
       Serial sr=new Serial();
       Object selectedItem = jComboBox1.getSelectedItem();
        
        String com = selectedItem.toString();
       sr.ser(x.getBytes(),com);
       sr.close();

        private void button1_Click(object sender, EventArgs e)
        {

string[] ports = SerialPort.GetPortNames();

foreach (string port in ports)
            {
                comboBox1.Items.Add(port);
            }

private void button2_Click(object sender, EventArgs e)
        {

            string t = comboBox1.Text.ToString();

string s = textBox1.Text.ToString();

sErial(t, s);