Opening image files in java applet

Question

Hi,
I made an applet that opens up the image file and displays it.
When the photo is loaded, the program sets boolean photoLoaded = true;
and when the image is loaded, it has to do something else.
the problem is that I have to open the file twice meaning I would click
"open" button and select the photo, which doesn't do anything, so I have to go back
and click open button, select the photo, and open up again.
When I changed the code slightly so that it shows the first time, photoLoaded is still false the first time,
so I still have to open it up twice for photoLoaded to be true.
methods for opening an image file:
    private void loadPhoto() throws Exception{
        Frame parent = new Frame();
        FileDialog fd = new FileDialog(parent, "Please choose a image file:",
            FileDialog.LOAD);
        fd.show();
        String selectedImage = fd.getFile();
        if(selectedImage == null){
            // no image file selected
        }else{
            File ffile = new File(fd.getDirectory() + File.separator +
                                fd.getFile());
            boolean canOpen = accept(ffile);
            if(canOpen){
                imageLoaded = kit.getImage(selectedImage);
                width = imageLoaded.getWidth(ob);
                height = imageLoaded.getHeight(ob);
                /*get image*/
                imageLoaded = getImage(getCodeBase(), selectedImage);
                tracker.addImage(imageLoaded, 0);
                /* wait until image is loaded */
                try{
                    tracker.waitForAll();
                    photoLoaded = true;
                }catch(InterruptedException ex) {
                    //does nothing
                repaint();
    public boolean accept(File f){
        if(f.isDirectory()){
            return true;
        String extension = Utils.getExtension(f);
        if(extension !=null){
            if(extension.equals(Utils.gif) ||
               extension.equals(Utils.jpeg) ||
               extension.equals(Utils.jpg)){
                   return true;
            } else{
                return false;
        return false;
    public static class Utils{
        public final static String jpeg = "jpeg";
        public final static String jpg = "jpg";
        public final static String gif = "gif";
        /* get the extension of a file */
        public static String getExtension(File f){
            String ext = null;
            String s = f.getName();
            int i = s.lastIndexOf('.');
            if(i>0 && i<s.length()-1){
                ext = s.substring(i+1).toLowerCase();
            return ext;
    }and the paint method:
    public void paint(Graphics g)
        g.drawImage(background, 0, 0, this);
        if(photoLoaded == true){
            g.drawImage(imageLoaded, startingPtX, startingPtY, ob);
    }does anybody have idea on what's wrong with it?
thanks!

Answer 1

Is this what you mean by you have to load it twice? You load the image, then add it to the MediaTracker, then you do what ever you want with it--like get the width and height and set you flags.
   imageLoaded = kit.getImage(selectedImage);
   width = imageLoaded.getWidth(ob);
   height = imageLoaded.getHeight(ob);
   /*get image*/
   imageLoaded = getImage(getCodeBase(), selectedImage);
   tracker.addImage(imageLoaded, 0);