Скачать или смотреть How to Easily Send and Receive Messages with Native Messaging in Chrome

Discover a clear and concise guide on using `nativeMessaging` in Chrome to send and receive messages between your extension and a Python script. Learn how to troubleshoot and streamline communication effectively.
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How to Easily Send and Receive Messages with Native Messaging in Chrome

When working on Chrome extensions, you may encounter a need to communicate between your extension's JavaScript code and a backend application, like a Python script. This communication can be achieved through Chrome's native messaging feature. In this guide, we will solve the problem of sending the URL of the currently active tab from a Chrome extension to a Python script, and ensure the script receives this information correctly.

The Problem

You want to send the URL of the active tab in a Chrome window to a Python script via nativeMessaging. While you have the basic setup in place, you've faced an issue where the Python script does not seem to receive the message correctly.

You might have noticed that the script hangs at the beginning of the while loop, indicating that it does not receive the message or is unable to read the expected data. This can be frustrating, especially when you're unsure of what is going wrong.

Understanding the Solution

Here's how we can fix the communication issue step-by-step. The main changes involve ensuring that the Python script correctly reads incoming messages.

Step 1: Modifying the JavaScript Code

Your popup.js file does not require changes, as it is already set up to send messages correctly. Here is a snippet of what it should look like:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Updating the Python Script

The key changes need to be made in the dlvideo.py file to correctly read the incoming message. Here’s the revised script:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Simplifying the Batch File

Lastly, your batch file (yt_dlp.bat) can be simplified as follows:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Keeping the Manifest File Unchanged

Your manifest file (manifestAPP.json) does not need any modifications. Just ensure it's set up correctly to connect to your Python application.

Conclusion

By making the above changes, you have established a reliable way to send a message from a Chrome extension to a Python script using nativeMessaging. It ensures that the message is received and processed correctly, allowing for seamless communication between the two environments.

Feel free to implement this solution in your project, and happy coding!