无法从节点连接读取描述符：连接到系统的设备无法使用 ChromeDriver Chrome 通过 Selenium 运行错误

Question

from selenium import webdriver
from selenium.webdriver.support.ui import WebDriverWait
import time
import pyautogui
import requests
import nltk   
import urllib.request
import random



driver=webdriver.Chrome()
driver.get('https://www.karsanj.net/login.php')
userm=driver.find_element_by_id('username')
userm.send_keys('gdbcfss')
time.sleep(2)
passwoord=driver.find_element_by_id('password')
passwoord.send_keys('fbxeedf')
time.sleep(2)
sal =driver.find_element_by_id("salTahsili")
sal.click()
time.sleep(2)
pyautogui.press('down')
time.sleep(2)
pyautogui.press('enter')
time.sleep(2)
login=driver.find_element_by_name('login')
login.click()
time.sleep(10)
driver.get('https://www.karsanj.net/vschool_list.php')

def goonline():
    urlsite=driver.current_url()
        
def urlgetter(driver):
    time.sleep(7)
    try:
        onlineclass=driver.find_element_by_class_name('entrance-btn')
        onlineclass.click()
    except:
        print('no online classes in this time ')
    time.sleep(5)
    classon=driver.find_element_by_id('room_unique_url')
    classon.click()
    time.sleep(20)
    attend= driver.find_elements_by_class_name('tablet-beta-label')
    pyautogui.press('enter')
    time.sleep(15)
    try:
        pyautogui.click()
        close1=driver.find_elements_by_id('recording-locked-notifier_0')
        close1.click()
        close2=driver.find_elements_by_class_name('spectrum-Button spectrum-Button--secondary')
        close2.click()
    except:
        pass




urlgetter(driver)

当我运行它时，最后给我这个错误

DevTools listening on ws://127.0.0.1:60683/devtools/browser/9b15c32e-ddc1-4ddd-9abe-bcf597ad4821
[4888:9376:1120/223739.924:ERROR:device_event_log_impl.cc(211)] [22:37:39.924] USB: usb_device_handle_win.cc:1020 Failed to read descriptor from node connection: A device attached to the system is not functioning. (0x1F)

Answer 1

此错误消息...

DevTools listening on ws://127.0.0.1:60683/devtools/browser/9b15c32e-ddc1-4ddd-9abe-bcf597ad4821
[4888:9376:1120/223739.924:ERROR:device_event_log_impl.cc(211)] 
[22:37:39.924] USB: usb_device_handle_win.cc:1020 Failed to read descriptor from node connection: A device attached to the system is not functioning. (0x1F)

...暗示ChromeDriver 在尝试启动/生成新的浏览上下文时引发错误，即google-chrome 会话。

---

分析

此错误出现在windows-10 系统上，原因是连接的 USB 设备的回调错误，该设备无法正常工作。

此错误在usb_device_handle_win.cc 中定义如下：

void UsbDeviceHandleWin::GotDescriptorFromNodeConnection(
    TransferCallback callback,
    scoped_refptr<base::RefCountedBytes> request_buffer,
    scoped_refptr<base::RefCountedBytes> original_buffer,
    Request* request_ptr,
    DWORD win32_result,
    size_t bytes_transferred) {
  std::unique_ptr<Request> request = UnlinkRequest(request_ptr);
  if (win32_result != ERROR_SUCCESS) {
    SetLastError(win32_result);
    USB_PLOG(ERROR) << "Failed to read descriptor from node connection";
    std::move(callback).Run(UsbTransferStatus::TRANSFER_ERROR, nullptr, 0);
    return;
  }

---

解决方案

此错误无害，也不会阻止生成新的浏览上下文 即 Chrome 浏览器 会话。因此，您可以放心地忽略该错误。

---

参考文献

您可以在以下位置找到一些相关的详细讨论：

• USB: usb_device_handle_win.cc:1020 Failed to read descriptor from node connection error with ChromeDriver v87 / Chrome v87 using Selenium on Windows10
• Failed to read descriptor from node connection: A device attached to the system is not functioning error using ChromeDriver Selenium on Windows OS