JFileChooser in an applet

[Christophe Monnet]

Hello
I have signed my applet so it can write a file on the user's disk. This is working when the path is hardcoded.
But I would like to let the user choose where to save the file.
So I use the JFileChooser like this:

JFileChooser fc = new JFileChooser() ;
int returnVal = fc.showSaveDialog( this ); // this = Applet
String fileName = "C:\\image.jpeg" ; // default hardcoded value
if ( returnVal == JFileChooser.APPROVE_OPTION ) 
  {
  File aFile = fc.getSelectedFile();
  fileName = aFile.getName() ;
  }

This always makes the browser to crash. The dialog box appears but any interaction with it (click, move...) makes the browser to crash. I have to kill the process.
What's wrong with JFileChooser in applets ?

[Manfred Leonhardt]

Hi Christophe,
I don't think you should be having any problem. You didn't specify which Browser and version you were using. I have tried similar code on IE version 6 and have no problems. I have included the java code below and the HTML file inside it as a comment.

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
/*
   <OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93" 
           width=150 height=100 
 codebase="http://java.sun.com/products/plugin/1.3/jinstall-13-win32.cab#Version=1,3,0,0"> 
     <PARAM NAME="code" value="FileApplet.class">
   </OBJECT>
 */
public class FileApplet extends JApplet
{
  public void init()
  {
    JButton b = new JButton( "File" );
    b.addActionListener( 
      new ActionListener()
      {
        public void actionPerformed( ActionEvent ae )
        {
          JFileChooser fc = new JFileChooser();
          fc.setCurrentDirectory( new File( "C:\\" ) );
          int returnVal = fc.showSaveDialog( FileApplet.this ); 
          String fileName = "C:\\image.jpeg" ;
          if ( returnVal == JFileChooser.APPROVE_OPTION )   
          {  
            File aFile = fc.getSelectedFile();  
            fileName = aFile.getName();  
          }
          System.out.println( fileName );
        }
      });
      getContentPane().add( b );
  }
}

Enjoy,
Manfred.

[Christophe Monnet]

I've tried your example and yes it works!
The SAME code when called from my applet makes IE6 and NS6.1 to crash !
The only difference being that I don't launch the JFileChooser with a JButton but by calling a public function. And this public function is called in the browser via JavaScript.

  public void testWriteFile() {
    JFileChooser fc = new JFileChooser();
    fc.setCurrentDirectory( new File( "C:\\" ) );
    int returnVal = fc.showSaveDialog( MyApplet.this );
    String fileName = "C:\\image.jpeg" ;
    if ( returnVal == JFileChooser.APPROVE_OPTION ) {
      File aFile = fc.getSelectedFile();
      fileName = aFile.getName();
      saveAsJPEG( aFile.getPath() ) ;
    }
/*
<applet
  codebase = "."
  code     = "MyPackage.MyApplet.class"
  archive  = "MyAppletSigned.jar"
  name     = "MyApplet"
  width    = "350"
  height   = "495"
  hspace   = "0"
  vspace   = "0"
  align    = "top"
  MAYSCRIPT
>
</applet>
<br>
<a href='javascript:document.applets[0].testWriteFile();'> testWriteFile() </a>
*/

When I click on the link "testWriteFile" the JFileChooser appears and then browser "not responding" in TaskManager.
[This message has been edited by Christophe Monnet (edited November 27, 2001).]