使用“locateCenterOnScreen”命令时，pyautogui 在屏幕上找不到图像

Question

所以，我正在使用

pyautogui

自动化 Python 库，并尝试在屏幕上找到图片的轴 (x, y)。

根据官方文档，我们有以下命令，据说可以发现屏幕上图片的轴。

>>> pyautogui.locateCenterOnScreen('looksLikeThis.png') # returns center x and y
(898, 423)

但是，它在我的屏幕上找不到图像

1. 这是一个简单的代码，该错误已经发生：

import pyautogui
pyautogui.FAILSAFE = False

pyautogui.moveTo(0, 0, duration=0)
# pyautogui.click(x=650, y=850, clicks=1, interval=0, button='left', duration=1) # Chrome
x, y = pyautogui.locateCenterOnScreen("resources/chrome.png")
pyautogui.click(x=x, y=y, clicks=1, interval=0, button='left', duration=1)

2. 这是我正在搜索的图像：

‣https://i.imgur.com/pSbaUlL.png

3. 这是我的屏幕（MacOS）：

‣https://i.imgur.com/6W6Aic0.png

4. 这是错误：

>>> pyautogui.locateCenterOnScreen("resources/chrome.png")
Traceback (most recent call last):
  File "/Users/victorcosta/.asdf/installs/python/3.11.3/lib/python3.11/site-packages/pyautogui/__init__.py", line 172, in wrapper
    return wrappedFunction(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/victorcosta/.asdf/installs/python/3.11.3/lib/python3.11/site-packages/pyautogui/__init__.py", line 204, in locateCenterOnScreen
    return pyscreeze.locateCenterOnScreen(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/victorcosta/.asdf/installs/python/3.11.3/lib/python3.11/site-packages/pyscreeze/__init__.py", line 447, in locateCenterOnScreen
    coords = locateOnScreen(image, **kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/victorcosta/.asdf/installs/python/3.11.3/lib/python3.11/site-packages/pyscreeze/__init__.py", line 405, in locateOnScreen
    retVal = locate(image, screenshotIm, **kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/victorcosta/.asdf/installs/python/3.11.3/lib/python3.11/site-packages/pyscreeze/__init__.py", line 383, in locate
    points = tuple(locateAll(needleImage, haystackImage, **kwargs))
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/victorcosta/.asdf/installs/python/3.11.3/lib/python3.11/site-packages/pyscreeze/__init__.py", line 371, in _locateAll_pillow
    raise ImageNotFoundException('Could not locate the image.')
pyscreeze.ImageNotFoundException: Could not locate the image.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/victorcosta/.asdf/installs/python/3.11.3/lib/python3.11/site-packages/pyautogui/__init__.py", line 174, in wrapper
    raise ImageNotFoundException  # Raise PyAutoGUI's ImageNotFoundException.
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
pyautogui.ImageNotFoundException

Answer 1

从

pyautogui

中

pyscreeze

的源代码中，它检测到

cv2

，如下所示：

_useOpenCV: bool = False
try:
    import cv2
    import numpy

    _useOpenCV = True
except ImportError:
    pass  # This is fine, useOpenCV will stay as False.

然后根据

locateAll

设置 _useOpenCV

# set the locateAll function to use opencv if possible; python 3 needs opencv 3.0+
# TODO - Should this raise an exception if zero instances of the image can be found
# on the screen, instead of always returning a generator?
locateAll = _locateAll_pillow
if _useOpenCV:
    locateAll = _locateAll_opencv
    if not RUNNING_PYTHON_2 and cv2.__version__ < '3':
        locateAll = _locateAll_pillow

根据提供的信息，请检查您是否已正确安装

opencv-python

软件包 尝试像在源代码中所做的那样导入它。

这就是我的代码使用 opencv 的样子：

import os
import pyautogui


pyautogui.FAILSAFE = False

pyautogui.moveTo(0, 0, duration=0)
# pyautogui.click(x=650, y=850, clicks=1, interval=0, button='left', duration=1) # Chrome
dirname = os.path.dirname(__file__)
img_path = os.path.join(dirname, "resources/chrome.png")

x, y = pyautogui.locateCenterOnScreen(img_path, confidence=0.7)
pyautogui.click(x=x, y=y, clicks=1, interval=0, button='left', duration=1)