python - 如何使用 Selenium 为 PDF 打印指定打印位置

Question

无论我做什么，文件都会不断打印到我的下载(Windows 默认)文件夹中，而不是指定的文件夹中。我做了我的研究，显然应该使用 savefile.default_directory 选项而不是 download.default_directory 但它无论如何都不起作用。我尝试从路径中删除尾随 \\ 但没有成功。如果有任何不同，这是在工作 PC 上，Windows 10 机器上。

   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

您有两个问题，第一个是您设置了两次 prefs，并且由于 add_experimental_option() 使用字典作为选项，第二个设置覆盖了第一个，所有这些设置实际上都被删除了。

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

第二个问题是在路径上使用原始字符串 r，它的计算结果为 C:\Users\Lucas\Downloads\ECV\\\\ 这是无效的。使用 / 而不是 \ "C:/Users/Lucas/Downloads/ECV/" 或使用 \\ 没有 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();')