Screencapture -l : 非法选项？答案

【问题标题】：Screencapture -l : illegal option?Screencapture -l : 非法选项？
【发布时间】：2013-09-06 21:59:09
【问题描述】：

我在 SO 上的许多页面（例如这里：https://apple.stackexchange.com/questions/56561/how-do-i-find-the-windowid-to-pass-to-screencapture-l）中看到您必须使用以下命令： screencapture -l 以便在给定 ID 的情况下捕获单个窗口。

但是，当我尝试在终端中输入 screencapture -l 时出现此错误：

screencapture: 非法选项 -- l

我检查了一个参考，实际上我看不到 -l 作为屏幕捕获的可能属性：http://guides.macrumors.com/screencapture

你怎么解释这个？我该如何解决这个问题？

【问题讨论】：

标签： macos terminal command-line-interface screen-capture

【解决方案1】：

不确定这是一个编程问题还是更适合 apple.stackexchange.com 的问题，但无论如何：

当我运行“screencapture -l”时，我看到了：

screencapture: illegal option -- l
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

他们没有在上面的输出中说清楚（“windowsid”？），但看起来“-l”选项需要一个窗口 id，因此屏幕捕获将捕获屏幕上的单个窗口。

【讨论】：

感谢您的回答。所以基本上你是说我们需要提供一个windowsid才能让它工作。但是，如果我输入这样的命令： screencapture -l$(osascript -e 'tell app "Safari" to id of window 1') test.png 按照这里的建议(apple.stackexchange.com/questions/56561/…) 它也不起作用。给我同样的错误。