java.comm

[cleary1981]

Hi,

I am trying to get setup to write a realtime program for serial port communication. Problem im having is that sun say that java.comm is no longer available and that rxtx site just baffles me. I tried downloading several of the files but the zip folders where empty. Is there an alternative that anyone can recomment or even a sample script that someone has developed?

[JosAH]

Hi,

I am trying to get setup to write a realtime program for serial port communication. Problem im having is that sun say that java.comm is no longer available and that rxtx site just baffles me. I tried downloading several of the files but the zip folders where empty. Is there an alternative that anyone can recomment or even a sample script that someone has developed?

So I noticed: they've made a bit of a mess out of it; all you need are three files:

1) RXTXcomm.jar: the Java api identical to Sun's API
2) rxtxParalel.dll : parallel port support library
3) rxtxSerial.dll: serial port support library.

The two dlls belong in the bin directory of your JRE and the jar can be convenienty
stored in the lib\ext directory of that same JRE. I still have those files from the
2.1.7 distribution but I have no idea how to get them across; I don't have any
web space anymore ... maybe you can open up your email address and close
it again after you've received those three files (total: 182KB)

kind regards,

Jos

[cleary1981]

Thanks, that should be my email open now.

[cleary1981]

yeah I got those ok. Thanks Jo

[JosAH]

yeah I got those ok. Thanks Jo

Good; remember: stick those dlls in your jre bin directory and that jar in your
jre lib\ext directory (or anywhere on your classpath). The packages are in the
gnu namespace as in:

import gnu.io.CommPortIdentifier;
import gnu.io.PortInUseException;
import gnu.io.SerialPort;
import gnu.io.UnsupportedCommOperationException;
 

All the rest of the code is identical to Sun's implementation and you can use
Sun's API documentation for it.

kind regards,

Jos

[cleary1981]

I dont suppose you have any code that I could use to check my installation is correct?

[JosAH]

I dont suppose you have any code that I could use to check my installation is correct?

you can try something like this for starters:

Enumeration locPortList = CommPortIdentifier.getPortIdentifiers();
 
while (locPortList.hasMoreElements()) {
 
    CommPortIdentifier locPortId= (CommPortIdentifier) locPortList.nextElement();
    System.out.println(locPortId.getName()+" serial: "+(locPortId.getPortType() == CommPortIdentifier.PORT_SERIAL));
}
 

It should give you a list of installed serial ports.

kind regards,

Jos