How to open the comm ports?

Question

Hi,
im using javacomm to detect my comm ports.i have two serial
and a parallel port (com1,com2 and LPT1) but it found no ports and throws
as follows,
found: javax.comm.CommPortEnumerator@e83912
found: 0 open ports
i placed .properties file in ..\jdk1.5.0\jre\lib
comm jar file in ..\jdk1.5.0\jre\lib\ext
and WIN32COM.DLL in ..jre\bin
am i doing right?
Here is the code,
import javax.comm.CommPortIdentifier;
import javax.comm.SerialPort;
import javax.comm.PortInUseException;
import java.util.Enumeration;
import java.util.Vector;
public class TestEnumeration {
public static void main(String args[]) {
Vector portslist = TestEnumeration.getAvailableSerialPorts();
System.out.println("found: "+portslist.size()+" open ports");
public static Vector getAvailableSerialPorts() {
CommPortIdentifier pId=null;
SerialPort sPort=null;
Enumeration pList=null;
boolean foundport=false;
pList = CommPortIdentifier.getPortIdentifiers();
String port=null;
Vector ports=new Vector();
if(!pList.hasMoreElements()) {
System.out.println("found: "+pList);
return ports;
while (pList.hasMoreElements()) {
pId = (CommPortIdentifier) pList.nextElement();
if (pId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
foundport=true;
try {
sPort = (SerialPort)pId.open("serialport", 1000);
} catch (PortInUseException e) {
foundport=false;
System.out.println(pId.getName()+ " is closed");
} finally {
if(sPort!=null) {
try { sPort.close(); } catch(Exception e) {}
if(foundport) {
ports.add(pId.getName());
System.out.println(pId.getName()+ " is open");
return ports;
please help me on how to open the comm ports..

Answer 1

Try this, It workd for me. Before doing this make sure you have serial ports on you r computer by following these steps:
open "regedit"
go to "HKEY_LOCAL_MACHINE" > HARDWARE > DEVICEMAP
and check if there is any serial ports. If htere is any, then use following program to enumerate throught the ports:
class SimpleRead() {
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;
          SimpleRead reader = new SimpleRead();
     if (!portFound) {
     System.out.println("port " + defaultPort + " not found.");
}