为什么我尝试在 Mac 上截屏时只能得到桌面壁纸？

Question

我正在尝试使用 python 截取屏幕截图。但是我尝试的每个选项似乎都只 return 桌面墙纸而不是顶部的程序。

这里是运行我尝试过的以及我是如何做的。

首先，我使用 autopy 尝试使用 autopy.color.hex_to_rgb(autopy.screen.get_color(x, y)) 从屏幕获取像素。但它只是告诉我桌面背景的像素。

然后我尝试 PIL(Pillow) 使用此代码：

from PIL import ImageGrab

im = ImageGrab.grab()
im.save('screenshot.png')

这仅 return 编辑了桌面墙纸。

最后，我尝试使用我在 thread 上找到的这个脚本。

import Quartz
import LaunchServices
from Cocoa import NSURL
import Quartz.CoreGraphics as CG


def screenshot(path, region = None):
    """region should be a CGRect, something like:

    >>> import Quartz.CoreGraphics as CG
    >>> region = CG.CGRectMake(0, 0, 100, 100)
    >>> sp = ScreenPixel()
    >>> sp.capture(region=region)

    The default region is CG.CGRectInfinite (captures the full screen)
    """

    if region is None:
        region = CG.CGRectInfinite

    # Create screenshot as CGImage
    image = CG.CGWindowListCreateImage(
        region,
        CG.kCGWindowListOptionOnScreenOnly,
        CG.kCGNullWindowID,
        CG.kCGWindowImageDefault)

    dpi = 72 # FIXME: Should query this from somewhere, e.g for retina displays

    url = NSURL.fileURLWithPath_(path)

    dest = Quartz.CGImageDestinationCreateWithURL(
        url,
        LaunchServices.kUTTypePNG, # file type
        1, # 1 image in file
        None
        )

    properties = {
        Quartz.kCGImagePropertyDPIWidth: dpi,
        Quartz.kCGImagePropertyDPIHeight: dpi,
        }

    # Add the image to the destination, characterizing the image with
    # the properties dictionary.
    Quartz.CGImageDestinationAddImage(dest, image, properties)

    # When all the images (only 1 in this example) are added to the destination, 
    # finalize the CGImageDestination object. 
    Quartz.CGImageDestinationFinalize(dest)


if __name__ == '__main__':
    # Capture full screen
    screenshot("/tmp/testscreenshot_full.png")

    # Capture region (100x100 box from top-left)
    region = CG.CGRectMake(0, 0, 100, 100)
    screenshot("/tmp/testscreenshot_partial.png", region=region)

又是return我的桌面墙纸。

为什么要这样做？我怎样才能像按 'cmd + shift + 3'.

一样获取屏幕截图

Answer 1

这是一项隐私功能，macOS 可防止任意应用查看其他应用的内容windows。要获得许可，您的应用需要 access to the screen recording permission in macOS preferences.

因为这是一个 Python 脚本，我认为你是运行脚本的应用程序需要获得许可，所以终端或任何 IDE 你使用。

为什么我尝试在 Mac 上截屏时只能得到桌面壁纸？

Why do I only get the Desktop wallpaper when trying to take a screenshot on a Mac?

python

python-3.x

macos

screenshot

screen-scraping