Save Dialog using JFIleChooser.

[Drake Silver]

Can anyone tell me why this will not save.
I got the code from another post, seeing as how there isn't a savedialog in Jbuilder component.
anyway, my thought on this is that it's not actually reading the data and saving it.
But with java I'm not sure...don't know what is done automatically and what's not.
here's the code:

/save button dialog using jfilechooser
  void jBtnSave_actionPerformed(ActionEvent e)
  {
    try
    { JFileChooser saveFile = new JFileChooser();//new save dialog
    saveFile.addChoosableFileFilter(new FileFilter()//adds new filter into list
     {
       String description = "Sorted Files (*.srt)";//the filter you see
       String extension = "srt";//the filter passed to program
       public String getDescription()
       {
         return description;
       }
       public boolean accept(File f)
       {
         if(f == null) return false;
         if(f.isDirectory()) return true;
         return f.getName().toLowerCase().endsWith(extension);
       }
     });
     saveFile.addChoosableFileFilter(new FileFilter()//adds new filter into list
     {
       String description = "Text Files(*.txt)";//the filter you see
       String extension = "txt";//the filter passed to program
       public String getDescription()
       {
         return description;
       }
       public boolean accept(File f)
       {
         if(f == null) return false;
         if(f.isDirectory()) return true;
         return f.getName().toLowerCase().endsWith(extension);
       }
     });
    saveFile.setCurrentDirectory(new File("*.srt"));
    int result=saveFile.showSaveDialog(this);
    // strSaveFileMenuItem is the parent Component which calls this method, ex: a toolbar, button or a menu item.
    String strFileName=saveFile.getSelectedFile().getName();
    // the file name selected by the user is now in the string 'strFilename'.
    }
    catch(Exception er)
    {
      statusBar.setText("Error Saving File:" + er.getMessage()+"\n");
    }
  }

[Dave Vick]

Moving to swing...

[Nathan Pruett]

JFileChooser doesn't save your data automatically... it just provides the user a nice way to provide the file where they want to save the data...

After the :

    int result=saveFile.showSaveDialog(this);
    // strSaveFileMenuItem is the parent Component which calls this method, ex: a toolbar, button or a menu item.
    String strFileName=saveFile.getSelectedFile().getName();
    // the file name selected by the user is now in the string 'strFilename'.

lines you should make sure that the result value is JFileChooser.APPROVE_OPTION, otherwise the user cancelled out of the save. Then open an OutputStream or a Writer on the file returned from JFileChooser.getSelectedFile(). You'll probably want to look up some resources on java.io to see how you want to write your data to the file.

[Drake Silver]

alright, thank you athan.
I'll see what I can find.

[Drake Silver]

hi, why would i call System.exit() in a JFileChooser Dialog?
would that close the whole program, or jut the dialog window?
I was thinking of using something like:

if(chooser.showSaveDialog(null) !=
   JFileChooser.Approve_OPTION)
   System.exit(0);
File OutFile = chooser.getSelectedFile(selectedFile)

Also, I was wondering.
When do I close a stream...In my Book, it talks about opening buffers and streams and closing the stream..in.close, do i still have to close that stream if I'm using JFileChooser.
If so, how do I close an output stream, for saving files.
out.close, doesn't work?
[ November 22, 2002: Message edited by: Drake Silver ]

[Rene Liebmann]

JFileChooser has nothing to do with streams or buffers. As Nathan told you, it provides only a simple way to get the location, where to save a file. It is up to you, to do the whole saving stuff. Btw. System.exit(0) closes the whole application, not only the JFileChooser.
If you open a stream (FileOutputStream), then you have to flush the data before calling the close method, just to be shure, to save the file.

[Drake Silver]

ok...?
so ..how's this then.

File OutFile = saveFile.getSelectedFile();
     FileWriter myWriter = null;
     BufferedWriter outStream = new BufferedWriter(new FileWriter(OutFile));
     if(saveFile.showSaveDialog(this) == JFileChooser.APPROVE_OPTION)
     {
       OutFile = saveFile.getSelectedFile();
       if (OutFile.canWrite() || !OutFile.exists())
       {
         myWriter = new FileWriter(OutFile);
       }
     }
     else
     {
       //pops up error message 
       JOptionPane.showMessageDialog(jTxtADisplay, "Error: Can't write to File");
     }
    outStream.close();//close buffered writer stream
    }

my problem is that I don't think it's taking the text from the text area and then saving it...
I get a null pointer exception when trying to save.
EDITED:
No, i think i know what the problem is...
In saveFile.getSelectedFile(), i'm trying to pick a file...but from where?
So..I am point to the wrong spot...I should be doing something like
saveFile.GetSelectedFile(TextArea.getText())
right?
[ November 22, 2002: Message edited by: Drake Silver ]

[Rene Liebmann]

The only error, which i can see is in the line
saveFile.setCurrentDirectory(new File("*.srt"));
This is no directory name. You should specify either "." or "C:/tmp/andsoon" - even a directory.
I think, this will be the reason for your NullPointerException.