Resolving USB Device Read Errors in ChromeDriver Selenium on Windows: Installation and Application of pywin32 Library

When using ChromeDriver and Selenium for web automation testing, developers may encounter the following error message on Windows operating systems:

[8552:6856:1120/155118.770:ERROR:device_event_log_impl.cc(211)] [15:51:18.771] USB: usb_device_handle_win.cc:1020 Failed to read descriptor from node connection: A device attached to the system is not functioning. (0x1F)

This error typically occurs during the process of launching a Chrome browser session, manifesting as frequent USB device-related error messages in the logs. Although the error message may be concerning, it usually does not prevent the normal execution of Selenium scripts. However, for developers seeking clean log output, these messages can be disruptive.

Error Analysis and Technical Background

The error originates from issues ChromeDriver encounters when attempting to communicate with USB devices. Specifically, the error occurs in the GotDescriptorFromNodeConnection function within the usb_device_handle_win.cc file. When the Windows system reports malfunctioning USB devices, ChromeDriver logs this error. This is often due to driver incompatibility or system configuration issues, rather than defects in the Selenium script itself.

From a technical perspective, ChromeDriver, as a bridge between the Chrome browser and Selenium, needs to handle various system resources, including USB devices. In the Windows environment, USB device communication relies on the Win32 API. If API calls fail, the aforementioned error is generated. It is important to note that even when this error appears, ChromeDriver can usually still successfully launch the browser session, hence it is categorized as a "harmless error."

Core Solution: Installing the pywin32 Library

Based on community best practices and the highest-rated answer, the most effective method to resolve this error is to install the pywin32 library. This library provides Python support for accessing the Win32 API, which helps improve the interaction between ChromeDriver and Windows system components.

The installation steps are straightforward:

pip install pywin32

After installation, no modifications to existing Selenium code are necessary, and the error messages typically disappear. This is because the pywin32 library enhances Python's system integration capabilities in the Windows environment, potentially fixing underlying driver communication issues.

Code Examples and Configuration Optimization

In addition to installing the pywin32 library, developers can further improve their experience by optimizing ChromeDriver configuration. The following is a complete Python code example demonstrating how to correctly initialize ChromeDriver and apply best practices:

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

# Configure Chrome options to exclude log interference
chrome_options = Options()
chrome_options.add_experimental_option('excludeSwitches', ['enable-logging'])

# Specify ChromeDriver path and launch browser
driver = webdriver.Chrome(executable_path=r'C:\webdriver\chromedriver.exe', options=chrome_options)
driver.get("https://web.whatsapp.com")

In this example, we use the executable_path parameter to correctly specify the location of ChromeDriver and disable some log output via the excludeSwitches option. This configuration not only helps eliminate USB error messages but also reduces other unnecessary log interference.

Supplementary Solutions and Considerations

If the problem persists after installing the pywin32 library, developers can consider the following additional measures:

• Ensure the ChromeDriver version exactly matches the Chrome browser version.
• Check for Windows system updates to ensure all USB drivers are up to date.
• Try temporarily disconnecting non-essential USB devices to rule out specific hardware conflicts.
• Add exception handling logic to the Selenium script to gracefully handle potential errors.

It is important to emphasize that this error typically does not affect the core functionality of automation testing. Therefore, in most cases, developers can choose to ignore these error messages and focus on the correctness of the testing logic.

Conclusion

By installing the pywin32 library and optimizing ChromeDriver configuration, developers can effectively resolve USB device read errors in ChromeDriver Selenium on Windows systems. This solution is not only simple and easy to implement but also based on in-depth technical analysis, ensuring its reliability. For developers engaged in web automation testing, mastering these troubleshooting techniques will significantly enhance development efficiency and test environment stability.