Скачать или смотреть How to Use Invoke-RestMethod in PowerShell to Extract File Names from a Webpage

Learn how to effectively use PowerShell's `Invoke-RestMethod` and `Invoke-WebRequest` to scrape filenames from HTML documents.
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How to Use Invoke-RestMethod in PowerShell to Extract File Names from a Webpage

When working with web pages in PowerShell, you may encounter a scenario where you need to retrieve specific information, such as file names or links. A common challenge is extracting particular data directly from the HTML content returned by a web request. In this post, we will tackle the problem of fetching all zip file names from a webpage using PowerShell.

The Challenge

Imagine you need to connect to a webpage that contains links, and you're specifically interested in extracting all the zip file names listed in the HTML content. For example, given a snippet like this:

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

Your goal is to programmatically list out the zip files such as 1_1_!!_DEV_ORG_HIER.zip.

Initial Approach

Initially, you might have used the following command:

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

However, this method only provides the entire HTML content and does not extract specific links or filenames directly.

The Solution: Switching to Invoke-WebRequest

After some exploration, a straightforward solution is to switch from Invoke-RestMethod to Invoke-WebRequest. With Invoke-WebRequest, you can access the HTML content more effectively and extract the required data.

Here’s how to do it:

Step-by-Step Breakdown

Use Invoke-WebRequest: This command retrieves the HTML document from the specified URL, utilizing the same authorization headers for access.

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Extract Links: Once you have the response stored in variable $r, you can target the links section to isolate file names. Access the links property directly and grab the innerhtml.

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

Filter for Zip Files: If you want to filter the results and only get the zip file names, you can further process the $fileNames variable. Here’s how you can achieve that:

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

Example Code

Bringing it all together, here’s a complete example that captures the entire process:

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

Conclusion

Using Invoke-WebRequest is a powerful alternative when you need to extract specific elements from an HTML document in PowerShell. In this guide, we explored how to efficiently retrieve and filter filenames, ensuring you get the information you need without unnecessary complexity.

By leveraging these tools, you can automate data extraction tasks seamlessly, saving time and improving efficiency in your operations.

If you have any further questions or need additional assistance, feel free to reach out!