Saving an image froma a Canvas

Question

Hello,
I'm a beginner. I've created an application wich uses a native procedure, myFunc(), wich paints an image over a Canvas.
But now I want to create an Image from each frame that is painted over this Canvas. The paint method is like this one:
public void paint(Graphics g) {
   Rectangle r = this.getBounds();
    Image image = this.createImage(r.width, r.height);
    Graphics g = image.getGraphics();
    this.paint(g);
    try {
       ImageIO.write((RenderedImage)image, "png", new File(name));
   } catch(IOException ioe) {
}It works, but it just saves a gray image, such if no image were rendered to the Canvas. What's going wrong? Thank you

Answer 1

Sorry, I've changed some parts of the code for making it more comprenhensive. The correct one is:
public void paint(Graphics g) {
   Rectangle r = this.getBounds();
    Image image = this.createImage(r.width, r.height);
    Graphics g = image.getGraphics();
    this.myFunc(g);
    try {
       ImageIO.write((RenderedImage)image, "png", new File(name));
   } catch(IOException ioe) {
myFunc(g) is the native funcion