Taking a screenshot of a remote desktop using Sikuli - remote-desktop

Question

I have the following Java code which I am using to capture a screenshot:
import org.sikuli.script.Screen;
import javax.imageio.ImageIO;
import java.io.File;
import java.io.IOException;
public class Screenshot{
public static void main(String[] args) throws IOException
{
Screen screen = new Screen();
ImageIO.write(screen.capture(screen).getImage(), "png", new File("D:\\myScreen.png"));
}
}
I compile the piece of code using:
javac -classpath .;sikulixapi-2.0.4.jar Screenshot.java
and run it with:
java -classpath .;sikulixapi-2.0.4.jar Screenshot
I tried to run it remotely, using
psexec \\xx.xx.xxx.xxx -w "D:\Sikuli" java -classpath .;sikulixapi-2.0.4.jar Screenshot
The result is not the picture of the remote screen, but only a black background.
Is there any way to make this work?

Answer 1

To check wether you principally could get a shot of the remote screen this way, you can use what SikuliX uses internally: java.awt.Robot
try this:
import java.awt.*;
...
BufferedImage img = new Robot().createScreenCapture(new Rectangle(0, 0, 500, 500))
... and then your coding to store the image somewhere.
If the image is black, then you have a problem with the monitor setup on the remote system. It must be non-headless (real screen) and Robot must have access to an unlocked screen.
RaiMan from SikuliX