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Double Dragon · Guest

please help me with this strange problem regarding i/o to a file. you gotta
read it carefully or else u wont get it!!!

my program operates as a reader form and a writer form. in normal
conditions, i can make(append) new entries whenever i want, and reader will
read it. But my program works same as Recordable CDs. Only the entries in
first writer session are read, but if i launch writer again and append
entries, the reader will still read only those entries made in first
session. although the file size of generated file seems to grow with each
entry. What's the solution????pls help me!!somebody!!!!!

Arthur Ore · Guest

I think you are going to have to post some code.

Cut the code down to the minimum necessary to demonstrate the problem you
are having and also give exact steps as to what to run in what order to
cause your problem.

Arth
"Double Dragon" <mdoubledragon (AT) hotmail (DOT) com> wrote

Double Dragon · Guest

Here's the code of my reader Class!
The main area of focus is are the two or three lines that write and read
object.

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
public class SugarReader
{
private ObjectInputStream input;
private SugarTime buffer;

public SugarReader(JDesktopPane mframe,JMenuBar bar,String name)
{
String fname=new String("DataFiles\"+name+"'s Sugar Report.dds");
File f=new File(fname);
if (!f.exists())
{
JOptionPane.showMessageDialog(null, "Your Record File Doesn't Exist",
"File I/O Error",
JOptionPane.ERROR_MESSAGE);
}
else
{
MainList l=new MainList();
try
{
input = new ObjectInputStream(new FileInputStream(fname));
while (true)
{
l.addList((SugarTime)input.readObject());
}
}
catch (IOException ex)
{
System.out.println("EOF");
}
catch (ClassNotFoundException ex)
{
System.out.println(ex.getMessage());
}

String[][] s=l.getString();
TableFrame t=new TableFrame(mframe,name,"Blood Sugar Report",s);
try
{
input.close();
}
catch (IOException ex)
{
System.out.println("Resources Not Released");
}
bar.getMenu(0).getItem(0).setEnabled(true);
}
}
}

----------------------------------------------------------------------------
------------------------------------------------
And here is the Writer Class

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;

public class SugarForm extends BaseForm
{
private ObjectOutputStream output;
public SugarForm(final JDesktopPane mframe,final JMenuBar bar,final String
name,final String type)
{
super(mframe);

final String fname=new String("DataFiles\"+name+"'s Sugar Report.dds");
output=new ObjectOutputStream(new FileOutputStream(fname,true));

button[1].setEnabled(true);
button[1].setText("Submit");
button[1].addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
if (validateForms() && validateThis(tsvalue))
{
SugarTime s = new SugarTime(Integer.parseInt(tdate.getText()),
Integer.parseInt(tmonth.getText()),
Integer.parseInt(tyear.getText()),
Integer.parseInt(thour.getText()),
Integer.parseInt(tminute.getText()),
Float.parseFloat(tsvalue.getText()),

tfasting.getSelectedItem().toString());
try
{
output.writeObject(s);
}
catch (IOException ex)
{
JOptionPane.showMessageDialog(null,"Cannot Write To
File","File I/O Error",JOptionPane.ERROR_MESSAGE);
}
fileClose();

private void fileClose()
{
try
{
output.flush();
output.close();
}
catch (IOException ex)
{
System.out.println("Resources Not Released");
}
}
}

"Arthur Ore" <nospamthx_arthur (AT) nospamthx_arthurore (DOT) freeserve.co.uk> wrote in
message news:40b0dc78$1 (AT) newsgroups (DOT) borland.com...

Arthur Ore · Guest

Try adding an extra catch clause as shown in the code below.

I reckon you'll get a "java.io.StreamCorruptedException" error

In which case you are suffering from Sun's (not a) Bug 4293270

See http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4293270

You'll probably have to register to see the details.

Arth
"Double Dragon" <mdoubledragon (AT) hotmail (DOT) com> wrote

Arthur Ore · Guest

Try changing your extra catch clause as shown in the code below.

I reckon you'll get a "java.io.StreamCorruptedException" error

In which case you are suffering from Sun's (not a) Bug 4293270

See http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4293270

You'll probably have to register to see the details.

Note the error message will be displayed before the details of your objects.
i.e., you'll have to scroll up to see the error if you've written a large
volume of data.

Arth

Double Dragon · Guest

Sir!
It was the same thing as you pointed. I tried the workaround and
succeeded. Thankyou Very Much Sir! Maybe someday i'll be able to help Java
Community just as you did! Thanx Again!

"Arthur Ore" <nospamthx_arthur (AT) nospamthx_arthurore (DOT) freeserve.co.uk> wrote in
message news:40b1134f$1 (AT) newsgroups (DOT) borland.com...