Need Suggestions..

[Hussein Baghdadi]

Hey all.
I want to create a phone # detecdor application in Java.
I have a modem (56 KB) that is connected to the phone line, this modem is installed on COM4 port.
I am using Java Communication API to connect with the PC's ports.
the application is listing to COM4 and write whatever its recieves.
when dialing to my phone # and running the application, I got nothing , neither a result neither an exception.
well, I am not an expert in these topics, so any suggestions are welcomed.
thanks.

[William Brogden]

1. Are you sure that the package is installed correctly and that it can find all your com ports?
2. How have you implemented the "listening to COM4" code?
Bill

[Hussein Baghdadi]

I have developed a small application thats iterates over all the ports and print them, I get :
COM1, COM2, COM3, COM4, LPT1, LPT2
the following code is PhoneDetecdor class:

  
import java.io.*;
import java.util.*;
import javax.comm.*;
 
public class PhoneDetecdor implements SerialPortEventListener {
 
InputStream inputStream;
        SerialPort serialPort;

public PhoneDetecdor( ) {
Enumeration portList;
CommPortIdentifier portId;
portList = CommPortIdentifier.getPortIdentifiers();
while (portList.hasMoreElements()) {
portId = (CommPortIdentifier)portList.nextElement();
if (portId.getName( ).equals("COM4")) {
try {
serialPort = (SerialPort) portId.open("PhoneDetecdor", 2000);
} catch (PortInUseException e) {System.err.println(e.toString( ));
} 
try {
inputStream = serialPort.getInputStream();
} catch (IOException e) {System.err.println(e.toString( ));
} 
try {
serialPort.addEventListener(this);
} catch (TooManyListenersException e) {System.err.println(e.toString( ));
}
serialPort.notifyOnDataAvailable(true);
}
}
}

public void serialEvent(SerialPortEvent event) {
int value = 0;
switch (event.getEventType( )) {
case SerialPortEvent.DATA_AVAILABLE :
{
StringBuffer buf = new StringBuffer( );
while (value != -1) {
try {
value = inputStream.read( );
if (value == -1)
break;
buf.append((char)value);
} catch (IOException e) {
System.err.println("IO Error: " + e.toString( ));
}
}
}
}
}

public static void main (String[ ] arg) {
new PhoneDetecdor( );
}
}

Thanks for help ..

[William Brogden]

If this was my problem, I would be dumping all the information carried on those SerialPortEvent events to System.out. For example, you say you are dialing into the modem - this should cause a RI - Ring Indicator event. You really want to know every event that occurs - the modem has to be controlled step by step.

Once you are sure you are getting RI, you need to tell the modem to pick up the line - thats going to be an "AT" command of some sort ( ATA<cr> I think )- from the old Hayes Smartmodem command set that became a standard.

Unfortunately I have not messed with that for over 10 years so I can't guide you step by step. Talking to a modem requires that you have the serial connections wired up right and that you follow a particular series of commands to answer a connection.
Bill