Error on Connect Selenium Driver to an Existing Chrome Browser Instance

Question

I was following this tutorial (link below), but an error is happening that I don't know how I can solve it.

https://medium.com/@harith.sankalpa/connect-selenium-driver-to-an-existing-chrome-browser-instance-41435b67affd

I am trying to use the browser that is open to perform a search, because it is already logged into the account that I need.

I'm using chrome --remote-debugging-port=1024 to open chrome, after I execute this code below.

I found some solutions, but none solved my problem, either because the solution was in Java and I didn't understand or I didn't know how to rewrite in python.

Code:

from selenium import webdriver
from webdriver_manager.chrome import ChromeDriverManager
from selenium.webdriver.chrome.options import Options as ChromeOptions
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities

if __name__ == '__main__':
    options = ChromeOptions()
    options.add_argument('start-maximized')
    options.add_argument('--no-sandbox')
    options.add_argument('--disable-dev-shm-usage')
    options.add_argument('--remote-debugging-port=1024')
    options.add_argument('--disable-setuid-sandbox')
    options.add_experimental_option("debuggerAddress", "localhost:1024")
    options.binary_location = "C:\\Program Files (x86)\\Google\\Chrome\\Application\\chrome.exe"

    d = DesiredCapabilities.CHROME
    d["loggingPrefs"] = {"browser": "ALL"}

    driver = webdriver.Chrome(
        executable_path=ChromeDriverManager().install(),
        options=options,
        desired_capabilities=d
    )

    driver.get("https://google.com.br")

Error:

Traceback (most recent call last):
  File "C:/Users/danit/Desktop/project/main.py", line 22, in <module>
    desired_capabilities=d
  File "C:\Users\danit\Desktop\project\venv\lib\site-packages\selenium\webdriver\chrome\webdriver.py", line 81, in __init__
    desired_capabilities=desired_capabilities)
  File "C:\Users\danit\Desktop\project\venv\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 157, in __init__
    self.start_session(capabilities, browser_profile)
  File "C:\Users\danit\Desktop\project\venv\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 252, in start_session
    response = self.execute(Command.NEW_SESSION, parameters)
  File "C:\Users\danit\Desktop\project\venv\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 321, in execute
    self.error_handler.check_response(response)
  File "C:\Users\danit\Desktop\project\venv\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: unknown error: cannot connect to chrome at localhost:1024
from chrome not reachable

Thanks a lot.

score 1 · Accepted Answer · answered Sep 20 '20 at 06:58

The error says chrome is not reachable. Most probably that instance has been deleted

I am showing a simple method to save session data( all cookies will be saved ) and then load selenium to load from that instance.

Look at the following example


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

session = "mySession"
chrome_driver_path = '/home/aahnik/Downloads/apps/chromedriver'
whatsapp_web_url = "https://web.whatsapp.com/"

chrome_options = Options()
chrome_options.add_argument(f'--user-data-dir={session}')

driver = webdriver.Chrome(
    options=chrome_options, executable_path=chrome_driver_path)

driver.get(whatsapp_web_url)

Now execute this code. WhatsApp web will open. Login by scanning the QR Code.

Now close the window, and then terminate the program.

Now will see a folder named mySession in your current user directory.

Execute this code again.

This time you will find that you are already logged into WhatsApp.

Hope this helped.

Error on Connect Selenium Driver to an Existing Chrome Browser Instance

1 Answers1