selenium 法截屏网络元素

Question

我可以使用Firefox.get_screenshot_as_file（‘2.png’）对整个页面进行屏幕截图，但是当我使用pass.screenshot（‘1.png’）对网络元素进行屏幕截图时，总是会引发以下异常：

selenium.common.exceptions.WebDriverException: Message: Unrecognized command: GET /session/284283fa-53fc-4b33-b329-e6e888dbdcb0/screenshot/{35834cf1-c9c7-4129-99b1-24f30c6b56e6}

Answer 1

之所以会出现此异常，是因为如果没有某些第三方库或您自己的代码来处理硒中的元素，就无法截取它的屏幕快照。

它使用称为PIL的库来执行此操作：

from selenium import webdriver
from PIL import Image

fox = webdriver.Firefox()
fox.get('https://http://codingdict.com/')

# now that we have the preliminary stuff out of the way time to get that image :D
element = fox.find_element_by_id('hlogo') # find part of the page you want image of
location = element.location
size = element.size
fox.save_screenshot('screenshot.png') # saves screenshot of entire page
fox.quit()

im = Image.open('screenshot.png') # uses PIL library to open image in memory

left = location['x']
top = location['y']
right = location['x'] + size['width']
bottom = location['y'] + size['height']


im = im.crop((left, top, right, bottom)) # defines crop points
im.save('screenshot.png') # saves new cropped image