Re: CommPort integration
AndreasW wrote:
Knute Johnson schrieb:
Richard Wheeldon wrote:
AndreasW wrote:
i've got a question about the integration of a CommPort into a Java
programm. I need it for data transfer between the PC and a
Microcontroller.
// Get a port identifier
CommPortIdentifier portId =
CommPortIdentifier.getPortIdentifier(portName);
// Open a port
SerialPort port =
(SerialPort)portId.open("CommPortExample Application", 30000);
// Open an input Stream
InputStream in = port.getInputStream();
// Read data
Don't be suprised in you run into problems with Sun's API. If you do,
take a look at rxtx: http://users.frii.com/jarvi/rxtx/
Also, if you ever start wanting to add TCP access to your rs232-based
comms on the microcontroller side, I can strongly recommend Digi's EM
Regards,
Richard
RXTX has at least one serious bug under Windows. I have yet to have a
problem with Sun's API. I don't really know why Sun doesn't want to
support it any more but RXTX is not the answer.
Thank you very much for every answer. It's a great help for me.
But there is another problem. Is it correct, that I have to call the
library "javax.comm.*;" at the beginning of my program? This is written
in the documentation of Sun's commapi?! It shall be copy into the
<jdk>\jre\lib directory. But my compiler shows the Error message:
"Package javax.comm doesn't exists". What's wrong? The other files
(win32comm.dll and comm.jar) I've put in the right directorys, too?!
Greetings,
Andreas
To compile you need to put the comm.jar file in the JDK/jre/lib/ext
directory.
--
Knute Johnson
email s/nospam/knute/
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