I am trying to save a canvas element as a png image. This is my code right now but, unfortunately, it does not work:
import time
from selenium import webdriver
# From PIL import Imag.
driver = webdriver.Firefox()
driver.get('http://www.agar.io')
driver.maximize_window()
driver.find_element_by_id('freeCoins').click()
time.sleep(2)
# The part below does not seem to work properly.
driver.execute_script('function download_image(){var canvas = document.getElementByTagName("canvas");canvas.toBlob(function(blob) {saveAs(blob, "../images/output.png");}, "image/png");};')
I would like to see the solution in Python. I would also like to see a solution that does not require cropping at the end of the screenshot.
答案 0 :(得分:11)
您可以调用HTMLCanvasElement.toDataURL()
将画布作为PNG base64字符串。这是一个有效的例子:
import base64
from selenium import webdriver
driver = webdriver.Chrome()
driver.get("http://curran.github.io/HTML5Examples/canvas/smileyFace.html")
canvas = driver.find_element_by_css_selector("#canvas")
# get the canvas as a PNG base64 string
canvas_base64 = driver.execute_script("return arguments[0].toDataURL('image/png').substring(21);", canvas)
# decode
canvas_png = base64.b64decode(canvas_base64)
# save to a file
with open(r"canvas.png", 'wb') as f:
f.write(canvas_png)