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No output from Port Query using javax.comm

Posted on 2006-07-05
3
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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?

Cheers,
Steve

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() ==
                  CommPortIdentifier.PORT_SERIAL)
        {
          System.out.println("Serial port: " +
                                   portId.getName());
         } else if (portId.getPortType() ==
                     CommPortIdentifier.PORT_PARALLEL)
           {
            System.out.println("Parallel port: " +
                                     portId.getName());
           } else
             System.out.println("Other port: " +
                                      portId.getName());
          }
    }
}
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Question by:stevebeech
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3 Comments
 
LVL 35

Accepted Solution

by:
girionis earned 250 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
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Author Comment

by:stevebeech
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.

Steve
0
 
LVL 35

Expert Comment

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