Page 37 - The Definitive Guide to Building Java Robots

Preston_5564C02.fm Page 18 Wednesday, September 14, 2005 5:42 AM

18 CHAPTER 2 ■ SERIAL COMMUNICATION

Example 2-1. ListOpenPorts.java
package com.scottpreston.javarobot.chapter2;

import java.util.Enumeration;

import javax.comm.CommPort;
import javax.comm.CommPortIdentifier;
import javax.comm.PortInUseException;

public class ListOpenPorts {

private CommPortIdentifier portId;
private Enumeration portList;

public ListOpenPorts() {
portList = CommPortIdentifier.getPortIdentifiers();
}

public void list() throws InterruptedException, PortInUseException {
while (portList.hasMoreElements()) {
portId = (CommPortIdentifier) portList.nextElement();
if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
System.out.print("Serial Port = ");
}
if (portId.getPortType() == CommPortIdentifier.PORT_PARALLEL) {
System.out.print("Parallel Port = ");
}
System.out.print(portId.getName() + ", ");

CommPort port = portId.open("OpenTest", 20);
Thread.sleep(250);
System.out.println("Opened." + portId.getCurrentOwner());
port.close();
}
}

public static void main(String[] args) {
try {
ListOpenPorts openPorts = new ListOpenPorts();
openPorts.list();
} catch (InterruptedException ie) {
System.out.println("Unable to sleep.");
} catch (PortInUseException pe) {
System.out.println("Failed. Port In Use.");
}

}
}