Screen Capture in Java not capturing whole screen

awt, awtrobot, java, macos, screen

Solution

There is a tutorial Java multi-monitor screenshots that shows how to do it. Basically you have to iterate all screens:

GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice[] screens = ge.getScreenDevices();

for (GraphicsDevice screen : screens) {
 Robot robotForScreen = new Robot(screen);
 ...

Problem

I have a small piece of code that I use to keep track of time - very simply it takes a picture of my desktop every four minutes so that later I can go back over what I've been up to during the day - It works great, except when I connect to an external monitor - this code only takes a screen shot of my laptop screen, not the larger external monitor I'm working from - any ideas how to change the code? I'm running OSX in case that's relevant... ``` import java.awt.AWTException; import java.awt.Robot; import java.awt.Rectangle; import java.awt.Toolkit; import java.awt.image.BufferedImage; import java.io.*; import javax.imageio.ImageIO; class ScreenCapture { public static void main(String args[]) throws AWTException, IOException { // capture the whole screen int i=1000; while(true){ i++; BufferedImage screencapture = new Robot().createScreenCapture( new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()) ); // Save as JPEG File file = new File("screencapture"+i+".jpg"); ImageIO.write(screencapture, "jpg", file); try{ Thread.sleep(60*4*1000); } catch(Exception e){ e.printStackTrace(); } } } } ``` Following the solution given, I made some improvements and the code, for those interested, is under code review at https://codereview.stackexchange.com/questions/10783/java-screengrab

Original source