PyAutoGUI 区域参数不起作用，而是占据整个屏幕

Question

我是 Python 新手，试图弄清楚如何使用 pyautogui 截取特定区域的屏幕截图。这是我所拥有的：

import pyautogui

IM = pyautogui.screenshot(region=(20, 20, 500, 500))
IM.save('screen.png')

区域参数不起作用，它每次都会截图我的整个屏幕。 我在 MacOS 上。谢谢您的帮助！

Answer 1

是的，这是 Macos 的一个错误，他们只是忘记添加裁剪逻辑（并且还保存）

我是一个新手（实际上只是第二天才学习Python，因为我可能会错过一些东西，但这可以帮助找到这个答案的人）

我打算针对这个 bug 开启 PR，但我不确定他们会以多快的速度批准（看到 PR 挂了多久）

旧库代码：

def _screenshot_osx(imageFilename=None, region=None):
    """
    TODO
    """
    # TODO - use tmp name for this file.

    

    if tuple(PIL__version__) < (6, 2, 1):
        # Use the screencapture program if Pillow is older than 6.2.1, which
        # is when Pillow supported ImageGrab.grab() on macOS. (It may have
        # supported it earlier than 6.2.1, but I haven't tested it.)
        if imageFilename is None:
            tmpFilename = 'screenshot%s.png' % (datetime.datetime.now().strftime('%Y-%m%d_%H-%M-%S-%f'))
        else:
            tmpFilename = imageFilename
        subprocess.call(['screencapture', '-x', tmpFilename])
        im = Image.open(tmpFilename)

        if region is not None:
            assert len(region) == 4, 'region argument must be a tuple of four ints'
            region = [int(x) for x in region]
            im = im.crop((region[0], region[1], region[2] + region[0], region[3] + region[1]))
            os.unlink(tmpFilename)  # delete image of entire screen to save cropped version
            im.save(tmpFilename)
        else:
            # force loading before unlinking, Image.open() is lazy
            im.load()

        if imageFilename is None:
            os.unlink(tmpFilename)
    else:
        # Use ImageGrab.grab() to get the screenshot if Pillow version 6.3.2 or later is installed.
        im = ImageGrab.grab()

    return im

固定代码：

def _screenshot_osx(imageFilename=None, region=None):
    """
    TODO
    """
    # TODO - use tmp name for this file.

    

    if tuple(PIL__version__) < (6, 2, 1):
        # Use the screencapture program if Pillow is older than 6.2.1, which
        # is when Pillow supported ImageGrab.grab() on macOS. (It may have
        # supported it earlier than 6.2.1, but I haven't tested it.)
        if imageFilename is None:
            tmpFilename = 'screenshot%s.png' % (datetime.datetime.now().strftime('%Y-%m%d_%H-%M-%S-%f'))
        else:
            tmpFilename = imageFilename
        subprocess.call(['screencapture', '-x', tmpFilename])
        im = Image.open(tmpFilename)

        if region is not None:
            assert len(region) == 4, 'region argument must be a tuple of four ints'
            region = [int(x) for x in region]
            im = im.crop((region[0], region[1], region[2] + region[0], region[3] + region[1]))
            os.unlink(tmpFilename)  # delete image of entire screen to save cropped version
            im.save(tmpFilename)
        else:
            # force loading before unlinking, Image.open() is lazy
            im.load()

        if imageFilename is None:
            os.unlink(tmpFilename)
    else:
        # Use ImageGrab.grab() to get the screenshot if Pillow version 6.3.2 or later is installed.
        im = ImageGrab.grab()

        if region is not None:
            assert len(region) == 4, 'region argument must be a tuple of four ints'
            region = [int(x) for x in region]
            im = im.crop((region[0], region[1], region[2] + region[0], region[3] + region[1]))

        if imageFilename is not None:
            im.save(imageFilename)

    return im