Help about writing to a local COM port

From:

Ale <abonizzoni80@gmail.com>

Newsgroups:

comp.lang.java.help

Date:

Tue, 29 Jan 2013 01:37:57 -0800 (PST)

Message-ID:

<c072ac82-6675-4ca3-8308-fbf675f9edab@googlegroups.com>

Hi,
I'm using JDK 1.6.0_05 and I have to write to a local COM port (OS is Windows XP SP2 32 bit).

I've installed and set the Comm libraries :
1) downloaded the "comm.jar" and put under C:\Program Files\Java\jdk1.6.0_06\jre\lib\ext
2)copied "win32com.dll" to C:\Program Files\Java\jdk1.6.0_06\jre\bin
3)copied "javax.comm.properties" to C:\Program Files\Java\jdk1.6.0_06\jre\lib\ext

This is my code snippet, it should work but even if I don't get any error, the problem is already at the beginning because the command "CommPortIdentifier.getPortIdentifiers();" gives a NULL object, so no serial port read !!

Please could you help ?

Thanks a lot and best regards,
Alessandro

///////////////////////////
static Enumeration portList;
static CommPortIdentifier portId;
static SerialPort serialPort;
static OutputStream outputStream;
static String messageString="TEST";

public static void main(String[] args) {

try
{
portList = CommPortIdentifier.getPortIdentifiers();

while (portList.hasMoreElements()) {
    portId = (CommPortIdentifier) portList.nextElement();
    if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                     if (portId.getName().equals("COM2")) {
                        try {
                            serialPort = (SerialPort)
                                portId.open("SimpleWriteApp", 2000);
                        } catch (PortInUseException e) {}
                        try {
                            outputStream = serialPort.getOutputStream();
                        } catch (IOException e) {}
                        try {
                            serialPort.setSerialPortParams(9600,
                                SerialPort.DATABITS_8,
                                SerialPort.STOPBITS_1,
                                SerialPort.PARITY_NONE);
                        } catch (UnsupportedCommOperationException e) {}
                        try {
                            outputStream.write(messageString.getBytes());
                        } catch (IOException e) {}
                    }
                }
            }
        }
        catch (Exception e)
        {
          e.printStackTrace();
        }
    }
///////////////////////////