asked on

socket com3 port reader

i want to read com3 port

i install javax.com version 2.0

but i try to this code (SimpleRead.java) I use jdeveloper

output is :Process exited with exit code 0.

Could you help me to can read port

import java.io.*;
import java.util.*;
import javax.comm.*;

public class SimpleRead implements Runnable, SerialPortEventListener {
static CommPortIdentifier portId;
static Enumeration portList;

InputStream inputStream;
SerialPort serialPort;
Thread readThread;

public static void main(String[] args) {
portList = CommPortIdentifier.getPortIdentifiers();

while (portList.hasMoreElements()) {
portId = (CommPortIdentifier) portList.nextElement();
if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
// if (portId.getName().equals("COM1")) {
if (portId.getName().equals("/dev/term/a")) {
SimpleRead reader = new SimpleRead();
}
}
}
}

public SimpleRead() {
try {
serialPort = (SerialPort) portId.open("SimpleReadApp", 2000);
} catch (PortInUseException e) {}
try {
inputStream = serialPort.getInputStream();
} catch (IOException e) {}
try {
serialPort.addEventListener(this);
} catch (TooManyListenersException e) {}
serialPort.notifyOnDataAvailable(true);
try {
serialPort.setSerialPortParams(9600,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);
} catch (UnsupportedCommOperationException e) {}
readThread = new Thread(this);
readThread.start();
}

public void run() {
try {
Thread.sleep(20000);
} catch (InterruptedException e) {}
}

public void serialEvent(SerialPortEvent event) {
switch(event.getEventType()) {
case SerialPortEvent.BI:
case SerialPortEvent.OE:
case SerialPortEvent.FE:
case SerialPortEvent.PE:
case SerialPortEvent.CD:
case SerialPortEvent.CTS:
case SerialPortEvent.DSR:
case SerialPortEvent.RI:
case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
break;
case SerialPortEvent.DATA_AVAILABLE:
byte[] readBuffer = new byte[20];

try {
while (inputStream.available() > 0) {
int numBytes = inputStream.read(readBuffer);
}
System.out.print(new String(readBuffer));
} catch (IOException e) {}
break;
}
}
}

ASKER CERTIFIED SOLUTION

Manikandan Thiagarajan

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skychan

ASKER

import javax.comm.*;
import java.util.*;

public class gokdk {
public static void main(String[] args) {

Enumeration e = CommPortIdentifier.getPortIdentifiers();
System.out.print(e.hasMoreElements());
while(e.hasMoreElements())

System.out.println(e.nextElement());
}
}

print out : false

Mayank S

It seems that for some reason, getPortIdentifiers () is not returning what it should - what is the output of this:

CommPortIdentifier obj = CommPortIdenfier.getPortIdentifier ( "COM3" ) ;
CommPort port = obj.open ( "MyApplication", 100 ) ;
System.out.println ( port.getName () ) ;

Mayank S

Girionis, isn't this happening a little too often? 'That' recommendation was not followed ;-) I wonder how somebody would work this code out if their code does not look like the one I posted.