Robot().createScreenCapture 捕获带有打印对话框的图像

Question

我希望我的应用程序截取屏幕截图并显示一个打印对话框，以便用户可以打印屏幕截图。但是，截图太慢/对话框出现太快，导致截图中出现对话框（如下所示）。

BufferedImage image = new Robot().createScreenCapture(new Rectangle((int) frame.getLocationOnScreen().getX(), (int) frame.getLocationOnScreen().getY(), frame.getWidth(), frame.getHeight()));

...

if (printJob.printDialog()) {
    try {
        printJob.print();
    } catch (Exception PrintException) {
        PrintException.printStackTrace();
    }
}

有没有办法在显示打印对话框之前指示屏幕截图何时完成捕获，而不是使用人工 Thread.sleep()？

---

编辑：

好的，我想我知道我做错了什么。真正发生的情况是，在打印对话框显示并且用户单击“确定”之后，但在打印对话框动画消失之前，屏幕被捕获。这是由于以下代码：

// Print button action listener
public class printButtonPressed implements ActionListener {
    public void actionPerformed(ActionEvent arg0) {

        PrinterJob printJob = PrinterJob.getPrinterJob ();
        Book book = new Book ();
        PageFormat documentPageFormat = new PageFormat ();
        documentPageFormat.setOrientation(PageFormat.LANDSCAPE);
        book.append(new Page(), documentPageFormat);
        printJob.setPageable(book);

        if (printJob.printDialog()) {
            try {
                printJob.print();
            } catch (Exception PrintException) {
                PrintException.printStackTrace();
            }
        }
    }
}

// Create printable page
private class Page implements Printable {
    public int print (Graphics g, PageFormat pageFormat, int page) {

        JFrame frame = Main.frame;
        try { // THIS SHOULD NOT BE HERE
            screenShot = new Robot().createScreenCapture(new Rectangle((int) frame.getLocationOnScreen().getX(), (int) frame.getLocationOnScreen().getY(), frame.getWidth(), frame.getHeight());
        } catch (AWTException e) {
            e.printStackTrace();
        }

        Graphics2D g2d = (Graphics2D) g;
        g2d.translate (pageFormat.getImageableX (), pageFormat.getImageableY ());

        int pageWidth = (int) pageFormat.getImageableWidth();
        int newImageWidth = pageWidth;
        int newImageHeight = (int)((double)newImageWidth/screenShot.getWidth(null)*screenShot.getHeight(null));

        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
        g2d.drawImage(screenShot, 0, 0, newImageWidth, newImageHeight, 0, 0, screenShot.getWidth(), screenShot.getHeight(), null);

        return PAGE_EXISTS;
    }
}

如果 Robot().createScreenCapture 在任何 PrinterJob 内容之前被调用，那么屏幕将在打印对话框出现之前被捕获，从而解决了这个问题。

// Print button action listener
public class printButtonPressed implements ActionListener {
    public void actionPerformed(ActionEvent arg0) {

        JFrame frame = Main.frame;
        try { // MOVE THIS UP HERE
            screenShot = new Robot().createScreenCapture(new Rectangle((int) frame.getLocationOnScreen().getX(), (int) frame.getLocationOnScreen().getY(), frame.getWidth(), frame.getHeight());
        } catch (AWTException e) {
            e.printStackTrace();
        }

        PrinterJob printJob = PrinterJob.getPrinterJob ();
        Book book = new Book ();
        PageFormat documentPageFormat = new PageFormat ();
        documentPageFormat.setOrientation(PageFormat.LANDSCAPE);
        book.append(new Page(), documentPageFormat);
        printJob.setPageable(book);

        if (printJob.printDialog()) {
            try {
                printJob.print();
            } catch (Exception PrintException) {
                PrintException.printStackTrace();
            }
        }
    }
}

// Create printable page
private class Page implements Printable {
    public int print (Graphics g, PageFormat pageFormat, int page) {

        Graphics2D g2d = (Graphics2D) g;
        g2d.translate (pageFormat.getImageableX (), pageFormat.getImageableY ());

        int pageWidth = (int) pageFormat.getImageableWidth();
        int newImageWidth = pageWidth;
        int newImageHeight = (int)((double)newImageWidth/screenShot.getWidth(null)*screenShot.getHeight(null));

        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
        g2d.drawImage(screenShot, 0, 0, newImageWidth, newImageHeight, 0, 0, screenShot.getWidth(), screenShot.getHeight(), null);

        return PAGE_EXISTS;
    }
}

Answer 1

将其转储到一个数组中，然后解析整个数组，然后就可以保证一切都在那里

我的意思是这个

BufferedImage TestShot = iris.createScreenCapture(new Rectangle(0,0,width,height));
int[] ImgData = null;
TestShot.getRGB(0, 0, width, height, ImgData, 0, 0);
for(int i:ImgData){
    // count or something
}
// all of it is there in TestShot

应该可以。我不知道你为什么会遇到这个问题，我一直在使用机器人，我的截图功能可以立即使用。也许是您的 printJob 需要更多时间。