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Problem on Socket Program

2 replies on 1 page. Most recent reply: May 20, 2005 7:03 PM by KL Lam

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KL Lam

Posts: 2
Nickname: lam
Registered: May, 2005

Problem on Socket Program

Posted: May 12, 2005 12:34 AM

Hi all, please me to solve the problem.

I created a socket program TCPClient and communicate to Server. The program is workable when run on the 1st time. But it will hang up on the code 'while ((result=in.readLine()) != null)'

Here is my program.

import java.net.*;
import java.io.*;

public class TCPClient
{
String inputData, sendData;
String tmpCode, ctlCode;
int intCh;
char ch;
//private static String result;
StringBuffer chkChr;

public void TCPsend(String passData)
{
try
{
int serverPort = 26001;
String hostName = "172.19.1.111";

inputData = passData;

// Connet to the Server
Socket s = new Socket(hostName, serverPort);
DataOutputStream out = new DataOutputStream( s.getOutputStream());
BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));

// System.out.println("Inet Address " + s.getInetAddress());

// add device control code (Hex 13 or ASCII 19)at the end of record
tmpCode = " ";
intCh = 19;
ch = (char) intCh;
StringBuffer word = new StringBuffer(tmpCode);
word.setCharAt(0, ch);
ctlCode = word.toString();

// sendData = inputData + ctlCode;

sendData = inputData;
System.out.println("send record: " + sendData);
out.writeBytes(sendData);

sendData = ctlCode;
System.out.println("send record: " + sendData);
out.writeBytes(sendData);
out.flush();
try
{
String result;
while ((result=in.readLine()) != null)
{
System.out.println(result);
if (result.equals(ctlCode))
break;
}
}
catch (IOException e) { System.out.println("readLIne failed : " + e.getMessage()); }

System.out.println("while routine completed ");

// clear routine
out.close();
in.close();
s.close();

System.out.println("Client Socket closed successed");

}
catch (UnknownHostException e)
{
System.out.println("Sock:"+e.getMessage());
}
catch (EOFException e)
{
System.out.println("EOF:"+e.getMessage());
}
catch (IOException e)
{
System.out.println("Err IO:"+ e.getMessage()) ;
}

} // TCPsend
} // End class

Haik Hovsepian

Posts: 6
Nickname: haik
Registered: Oct, 2004

Re: Problem on Socket Program

Posted: May 20, 2005 12:27 AM

Hello.
The programm is hanging ou because the method in.readLine()
is wating for a text,if text comes it continues.
You must use this code

BufferedReader ois = new BufferedReader(
new InputStreamReader(
socket.getInputStream()));

while (true) {

if (ois.ready()) {

inputLine = ois.readLine();
System.out.println(inputLine);

}

}

KL Lam

Posts: 2
Nickname: lam
Registered: May, 2005

Re: Problem on Socket Program

Posted: May 20, 2005 7:03 PM

Thanks Haik,

One more question. How can I terminate the ois.readLine()when each records have a "^S" (ASCII code 19) character to indicate the end of the record?

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