Screen Capture

For documentation purposes (and perhaps remote support), we need
snapshot images of our application.
So let's build such support directly into our application itself.

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Code Snippets

We can capture whole desktop, and save it to a PNG file, as follows.

    public void captureScreen(String fileName) throws Exception {
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        BufferedImage image = new Robot().createScreenCapture(new Rectangle(screenSize));
        ImageIO.write(image, "png", new File(fileName));
    }

Alternatively, we might capture our JFrame, including its window decoration, as follows.

    public void captureFrame(JFrame frame, String fileName) throws Exception {
        BufferedImage image = new Robot().createScreenCapture(frame.getBounds());
        ImageIO.write(image, "png", new File(fileName));
    }