MacOS中某些应用程序的Java屏幕截图

Question

我想在我的MacOS中截取某些应用程序的屏幕截图,即使在另一个虚拟屏幕上也没有在活动屏幕中.

我可以使用以下代码进行活动屏幕捕获,但如何捕获给定的应用程序？

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 java.text.SimpleDateFormat;
import java.util.Date;
import javax.imageio.ImageIO;

public class Screenshot {
    public static void main(String args[]) throws AWTException, IOException {
        while(true) {
            String timeStamp = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss").format(new Date());

            BufferedImage screencapture = new Robot().createScreenCapture(
                new Rectangle(Toolkit.getDefaultToolkit().getScreenSize())
            );

            // Save as JPEG
            File file = new File("./screens/screencapture" + timeStamp + ".jpg");
            ImageIO.write(screencapture, "jpg", file);

            try {
                Thread.sleep(1000);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

Answer 1

尝试使用/ usr/sbin/screencapture,然后调用它

Runtime.getRuntime().exec("/usr/sbin/screencapture");

这是screencapture的使用输出

usage: screencapture [-icMPmwsWxSCUtoa] [files]
  -c         force screen capture to go to the clipboard
  -C         capture the cursor as well as the screen. only in non-interactive modes
  -d         display errors to the user graphically
  -i         capture screen interactively, by selection or window
               control key - causes screen shot to go to clipboard
               space key   - toggle between mouse selection and
                             window selection modes
               escape key  - cancels interactive screen shot
  -m         only capture the main monitor, undefined if -i is set
  -M         screen capture output will go to a new Mail message
  -o         in window capture mode, do not capture the shadow of the window
  -P         screen capture output will open in Preview
  -s         only allow mouse selection mode
  -S         in window capture mode, capture the screen not the window
  -t<format> image format to create, default is png (other options include pdf, jpg, tiff and other formats)
  -T<seconds> Take the picture after a delay of <seconds>, default is 5
  -w         only allow window selection mode
  -W         start interaction in window selection mode
  -x         do not play sounds
  -a         do not include windows attached to selected windows
  -r         do not add dpi meta data to image
  -l<windowid> capture this windowsid
  -R<x,y,w,h> capture screen rect
  files   where to save the screen capture, 1 file per screen

我认为带窗口id的-w选项是要使用的选项.但要获得窗口ID,您可能需要另一个实用程序.一种这样的效用是pyscreencapture.否则我肯定谷歌搜索如何获取窗口ID将导致更多的方法来获取您需要的窗口ID.

虽然我不完全确定您的虚拟屏幕是什么意思,但您可能在获取窗口ID或捕获屏幕时遇到问题.