如何使用 Selenium 指定 PDF 打印的打印位置

Question

無論我做什么，這些文件都會一直打印到我的下載（Windows 默認）文件夾中，而不是指定的文件夾中。 我做了我的研究，顯然應該使用savefile.default_directory選項而不是download.default_directory但它無論如何都不起作用。 我嘗試從路徑中刪除尾隨\\ ，但沒有成功。 如果有任何區別，這是在工作 PC 上，Windows 10 機器。

   import os
   os.environ["PATH"] += os.pathsep + r'C:\Program Files (x86)\Chromedriver99';

   from selenium.webdriver.chrome.options import Options
   from selenium import webdriver

   options = Options()
    options.add_experimental_option(
        "prefs",
        {
            "download.prompt_for_download": False,
            "profile.default_content_setting_values.automatic_downloads": 1,
            "download.default_directory": r"C:\Users\Lucas\Downloads\ECV\\",
            "savefile.default_directory": r"C:\Users\Lucas\Downloads\ECV\\",
            "download.directory_upgrade": True,
            "safebrowsing.enabled": True # Some answers include this, makes no difference
        },
    )
    options.add_experimental_option("excludeSwitches", ["enable-automation"])
    options.add_experimental_option("useAutomationExtension", False)

    # PDF printing settings
    print_settings = {
       "recentDestinations": [{
            "id": "Save as PDF",
            "origin": "local",
            "account": "",
        }],
        "selectedDestinationId": "Save as PDF",
        "version": 2,
        "isHeaderFooterEnabled": False,
        "isLandscapeEnabled": True
    }

    prefs = {'printing.print_preview_sticky_settings.appState': json.dumps(print_settings)}
    options.add_experimental_option('prefs', prefs)
    options.add_argument('--kiosk-printing') # Some answers include this, makes no difference


    driver = webdriver.Chrome(options=options)
    driver.get('https://stackoverflow.com/')
    driver.execute_script('window.print();')

Answer 1

您有兩個問題，第一個是您設置了兩次首選項，並且由於prefs add_experimental_option()使用字典作為選項，因此第二個設置覆蓋了第一個設置，並且所有這些設置實際上都被刪除了。

self._experimental_options = {}


def add_experimental_option(self, name, value):
    """
    Adds an experimental option which is passed to chrome.

    Args:
      name: The experimental option name.
      value: The option value.
    """
    self._experimental_options[name] = value

第二個問題是在路徑上使用原始字符串r ，它的計算結果為C:\Users\Lucas\Downloads\ECV\\\\這是無效的。 使用/而不是\ "C:/Users/Lucas/Downloads/ECV/"或使用\\而不使用r "C:\\Users\\Lucas\\Downloads\\ECV\\"

print_settings = {
    "recentDestinations": [{
        "id": "Save as PDF",
        "origin": "local",
        "account": "",
    }],
    "selectedDestinationId": "Save as PDF",
    "version": 2,
    "isHeaderFooterEnabled": False,
    "isLandscapeEnabled": True
}

prefs = {'printing.print_preview_sticky_settings.appState': json.dumps(print_settings),
         "download.prompt_for_download": False,
         "profile.default_content_setting_values.automatic_downloads": 1,
         "download.default_directory": "C:\\Users\\Lucas\\Downloads\\ECV\\",
         "savefile.default_directory": "C:\\Users\\Lucas\\Downloads\\ECV\\",
         "download.directory_upgrade": True,
         "safebrowsing.enabled": True}

options = Options()
options.add_experimental_option('prefs', prefs)
options.add_argument('--kiosk-printing')

driver = webdriver.Chrome(options=options)
driver.get('https://stackoverflow.com/')
driver.execute_script('window.print();')