Page 247 - The Unofficial Guide to Lego Mindstorms Robots

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Download prints a period for each line of the file it downloads to the RCX. If there's an error, you'll hear about it like this:

c:\>java Download thermometer.f
....
Line 5: Error: redefine isRunButtonPressed RbuttonState ? undefined word
c:\>

By default, Download uses the COM1 port. If you are not running Windows, or if you have your IR tower attached to a
different port, you can tell Download to use a different port like this:

C:\>java Download -port COM3 thermometer.f

Source Code

import java.io.∗;
import java.util.∗;

import javax.comm.∗;

public class Download {
public static void main (String[] args) {
String filename = args[args.length - 1];
String portName = "COM1";

for (int i = 0; i < args.length - 2; i++) {
if (args[i].equals("-port")) portName = args[i + 1];
}

try { new Download (filename, portName); }
catch (NoSuchPortException nspe) {
System.out.println("Sorry, I don't know about the " +
portName + " port. ");
}
catch (PortInUseException piue) {
System.out.println("Sorry, somebody else is using " +
portName + ".");
}
catch (UnsupportedCommOperationException ucoe) {
System.out.println(ucoe);
}
catch (IOException ioe) {
System.out.println("An IOException occurred: " + ioe);
}
}

private SerialPort mPort;
private Reader mFileIn;
private Writer mOut;
private PortListener mPortListener;

private static final int kCharSleep = 20;