javax.comm Help Needed
Hi, I have managed to install the java communications API and am running all the examples provided with the package well, on Windows 2000 Pro SP4 and jdk1.5.0_05. Now, the (allow me to call it) basic application of the javax.comm is BlackBox which I have no idea what it is meant to do. The documentations are just talking about how to set the Baud rate and what-have-you. Are they assuming knowledge of anything before you may use that package? If so, what is it? And where can I get the knowledge (eBook, article or any other means) from? Thanks.
[555 byte] By [
Jamwaa] at [2007-10-2 21:19:05]
maybe u can check out this base class that i've developed
it basically contains methods to allow u to open/read/write to a rs232 ports using java comms api
import javax.comm.*;
import java.io.IOException;
import java.util.*;
import java.io.OutputStream;
import java.io.InputStream;
public class RS232BaseClass {
private SerialPort portName;
private CommPortIdentifier portID;
private OutputStream portOut = null;
private InputStream portIn = null;
public RS232BaseClass() {
portName = null;
portID = null;
portIn = null;
portOut = null;
}
// Method to re-init everything
// ****************************
public void reInit() {
this.portName = null;
this.portID = null;
this.portIn = null;
this.portOut = null;
}
// Method to retrieve list of ports in OS
// **************************************
public void getListofPorts() {
System.out
.println("Getting the List of Ports configured in this server");
Enumeration pList = CommPortIdentifier.getPortIdentifiers();
while (pList.hasMoreElements()) {
portID = (CommPortIdentifier) pList.nextElement();
System.out.println("Port :[" + portID.getName() + "]");
}
}
// Method to open specific port required
// **************************************
public void openPorts(String toOpenPort) {
System.out.println("Process is opening port: [" + toOpenPort + "]");
// Retrieve the port
try {
portID = CommPortIdentifier.getPortIdentifier(toOpenPort);
} catch (NoSuchPortException e) {
System.out
.println("No such port available to retrieve - Program will Exit!");
e.printStackTrace();
System.exit(1);
}
// Open the port
try {
portName = (SerialPort) portID.open(toOpenPort, 30000);
System.out.println("Port opened successfully!");
// Get Input Stream
portIn = portName.getInputStream();
// Get Output Stream
portOut = portName.getOutputStream();
} catch (PortInUseException e) {
System.out.println("Port is in use - Program will Exit!");
System.out.println("Owner is [" + e.currentOwner + "]");
e.printStackTrace();
System.exit(1);
} catch (IOException ioe) {
System.out
.println("IO Exception during stream IO - Program will Exit!");
ioe.printStackTrace();
System.exit(1);
}
}
// Method to set the port parameters - int baudrate, int dataBits, int stopBits, int parity
public void setPortParameters(int baudrate, int dataBits, int stopBits,
int parity) {
try {
portName.setSerialPortParams(baudrate, dataBits, stopBits, parity);
} catch (UnsupportedCommOperationException ucce) {
System.out
.println("Unsupported Comms Operation - Program will Exit!");
ucce.printStackTrace();
System.exit(1);
}
}
// Method to set Port Wait timing - Different for different devices
public void setPortReceiveTimeout(int timeOut) {
try {
this.portName.enableReceiveTimeout(timeOut);
} catch (UnsupportedCommOperationException ucce) {
System.out
.println("Unsupported Comms Operation - Program will Exit!");
ucce.printStackTrace();
}
}
// Method to Read contents from the port
// **************************************
public String readPort() {
System.out.println("Reading From port...");
StringBuffer buffer = new StringBuffer();
int ch = 0;
try {
while ((ch = portIn.read()) != -1)
buffer.append((char) ch);
portIn.close();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("String read is [" + buffer.toString()
+ "] Length is " + buffer.toString().length());
return buffer.toString();
}
// Method to write contents to the port
// ************************************
public void writePort(String outToPort) {
try {
portOut.write(outToPort.getBytes());
System.out.println("Writing out [" + outToPort + "]");
} catch (IOException e) {
System.out.println("IO Exception during Writing to port");
e.printStackTrace();
}
}
// Method to close the port
public void closePort() {
System.out.println("Closing Port");
this.portName.close();
}
}
