Do zrobienia zrzutu ekranu używam następującego kodu:

        Robot robot = new Robot();
        BufferedImage image = robot.createScreenCapture(screenRectangle);
        ImageIO.write(image,"png", file);

Ten kod działa dobrze. Robi zrzuty ekranu mojego pulpitu, gdy uruchamiam program itp.

Jednak gdy próbuję uruchomić najpierw jakąś grę, zastosuj jąpełny ekran, to nie działa poprawnie. Wyświetla czarny ekran, albo ten sam „początkowy” obraz.

Czy ten problem jest znany i jak to naprawić?

Drugie Pytanie : Czy to możliwe, aby zasymulować klucz „Print Screen”, który możemy mieć na klawiaturze, aby rozwiązać ten problem? Ponieważ mogę użyćDrukuj klawisz ekranu kiedy aplikacja jest uruchamiana na pełnym ekranie, a kiedy wklejam, mam swój ekran.
(Tak, ale w Javie:Skopiuj zawartość ekranu lub aktywnego okna ? )

Z góry dziękuję za pomoc.

EDYTOWAĆ : Andrew Thompson był uprzejmy zaproponować mi następujący kod, który będzie dobrym pierwszym krokiem do rozwiązania tego problemu:

import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.event.KeyEvent;

public class ScreenshotUsingPrintScreen {

public static void main(String[] args) throws Exception {
    int i = KeyEvent.VK_PRINTSCREEN;
    Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard();
    DataFlavor[] flavors = cb.getAvailableDataFlavors();
    System.out.println("Before: ");
    for (DataFlavor flavor : flavors) {
        System.out.println(flavor);
    }

    // get the screenshot
    Robot robot = new Robot();
    robot.keyPress(KeyEvent.VK_PRINTSCREEN);
    robot.delay(40);
    robot.keyRelease(KeyEvent.VK_PRINTSCREEN);
    robot.delay(40);

    cb = Toolkit.getDefaultToolkit().getSystemClipboard();
    flavors = cb.getAvailableDataFlavors();
    System.out.println("After: ");
    for (DataFlavor flavor : flavors) {
        System.out.println(flavor);
    }
}

}

Kompiluje się dobrze, ale otrzymuję następujący błąd podczas jego uruchamiania.

Before: 
java.awt.datatransfer.DataFlavor[mimetype=application/x-java-text-encoding;representationclass=[B]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.io.Reader]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.lang.String]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.nio.CharBuffer]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=[C]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.io.InputStream;charset=UTF-16]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.nio.ByteBuffer;charset=UTF-16]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=[B;charset=UTF-16]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.io.InputStream;charset=UTF-8]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.nio.ByteBuffer;charset=UTF-8]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=[B;charset=UTF-8]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.io.InputStream;charset=UTF-16BE]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.nio.ByteBuffer;charset=UTF-16BE]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=[B;charset=UTF-16BE]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.io.InputStream;charset=UTF-16LE]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.nio.ByteBuffer;charset=UTF-16LE]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=[B;charset=UTF-16LE]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.io.InputStream;charset=ISO-8859-1]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.nio.ByteBuffer;charset=ISO-8859-1]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=[B;charset=ISO-8859-1]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.io.InputStream;charset=US-ASCII]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=java.nio.ByteBuffer;charset=US-ASCII]
java.awt.datatransfer.DataFlavor[mimetype=text/html;representationclass=[B;charset=US-ASCII]
java.awt.datatransfer.DataFlavor[mimetype=application/x-java-serialized-object;representationclass=java.lang.String]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.io.Reader]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.lang.String]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.nio.CharBuffer]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=[C]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.io.InputStream;charset=unicode]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.nio.ByteBuffer;charset=UTF-16]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=[B;charset=UTF-16]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.io.InputStream;charset=UTF-8]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.nio.ByteBuffer;charset=UTF-8]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=[B;charset=UTF-8]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.io.InputStream;charset=UTF-16BE]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.nio.ByteBuffer;charset=UTF-16BE]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=[B;charset=UTF-16BE]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.io.InputStream;charset=UTF-16LE]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.nio.ByteBuffer;charset=UTF-16LE]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=[B;charset=UTF-16LE]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.io.InputStream;charset=ISO-8859-1]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.nio.ByteBuffer;charset=ISO-8859-1]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=[B;charset=ISO-8859-1]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.io.InputStream;charset=US-ASCII]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=java.nio.ByteBuffer;charset=US-ASCII]
java.awt.datatransfer.DataFlavor[mimetype=text/plain;representationclass=[B;charset=US-ASCII]
Exception in thread "main" java.lang.IllegalStateException: cannot open system clipboard
    at sun.awt.windows.WClipboard.openClipboard(Native Method)
    at sun.awt.datatransfer.SunClipboard.getClipboardFormatsOpenClose(SunClipboard.java:332)
    at sun.awt.datatransfer.SunClipboard.getAvailableDataFlavors(SunClipboard.java:172)
    at zipprotected.threadsTest.ScreenshotUsingPrintScreen.main(ScreenshotUsingPrintScreen.java:36)
Java Result: 1