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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，屏幕截图太慢/对话框出现得太快，导致对话框出现在屏幕截图中（如下所示）。

在此处输入图像描述

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 ：

好吧，我想我知道我做错了什么。真正发生的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捕获屏幕。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;
    }
}

相反，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;
    }
}
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1 回答 1

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将它转储到一个数组中然后解析整个数组然后你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

那应该行得通。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。也许它的 printJob 需要更多时间。

于 2013-06-10T16:24:45.513 回答