No output from Port Query using javax.comm

Posted on 2006-07-05
Medium Priority
Last Modified: 2010-03-31
I've installed javax.comm package (version 2.0) under Win XP.
I compile and run the following code but don't get any output.
Can anyone tell me why?


import javax.comm.*;
import java.util.*;

public class PortList
  public static void main(String [] args)
       Enumeration portList = CommPortIdentifier.getPortIdentifiers();

          while(portList.hasMoreElements()) {
        CommPortIdentifier portId = (CommPortIdentifier)portList.nextElement();
      if( portId.getPortType() ==
          System.out.println("Serial port: " +
         } else if (portId.getPortType() ==
            System.out.println("Parallel port: " +
           } else
             System.out.println("Other port: " +
Question by:stevebeech
  • 2
LVL 36

Accepted Solution

girionis earned 1000 total points
ID: 17042277
Have you registered the comm package and installed the configuration files properly? Have a look here: http://www.experts-exchange.com/Programming/Programming_Languages/Java/Q_21906501.html

Author Comment

ID: 17042316
Thanks Girionis!

I'd registered the commpackage correctly with the JDK, but hadn't copied the .dll and .props file into the JRE folders. It really ought to mention this in the installation instructions for the comm package.

Thanks for your (ever-so-quick) response.

LVL 36

Expert Comment

ID: 17042367
Thank you for accepting, glad I was of help :)

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