Скачать или смотреть Mastering Glob Pattern Matching in C+ + 98 on Linux

Learn how to implement file name pattern matching in C+ + 98 on Linux using the `glob` function. This guide provides clear code examples and explanations to help you get started.
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This video is based on the question https://stackoverflow.com/q/65772375/ asked by the user 'Amith Kotian' ( https://stackoverflow.com/u/6552428/ ) and on the answer https://stackoverflow.com/a/65777590/ provided by the user 'Ted Lyngmo' ( https://stackoverflow.com/u/7582247/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering Glob Pattern Matching in C+ + 98 on Linux: A Beginner's Guide

If you've ever tried to list files in a directory based on specific patterns in Linux using C+ + , you might have encountered the challenge of obtaining a list of filenames that match your criteria. This is where the glob function comes into play, providing a powerful solution for file name pattern matching in C+ + 98. In this guide, we will break down how to use glob effectively to achieve your desired results.

The Problem: Matching File Names

Imagine you have a directory, say /usr/local, filled with various files:

abc.txt

axy.txt

bcd.txt

azz.txt

bby.txt

You want to find and list all files that contain the letter 'a' in their names. To do this programmatically, you can leverage the glob function provided in the glob.h header.

The Solution: Using glob in C+ + 98

Step 1: Understanding the glob Function

The glob function is designed to look through directories and find files that match specified patterns. Here’s how to implement it effectively in your C+ + 98 program.

Step 2: Set Up Your Environment

Before we delve into the code, ensure you have proper access to your Linux environment and can compile C+ + code.

Step 3: Write the Code

Below is a clean and structured C+ + program using the glob function to list files matching a specified pattern.

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Step 4: Explanation of the Code

Includes and Namespaces: We include necessary headers, and wrap code inside the main() function for organization and error handling.

Function Definition: The glob function takes a string pattern and returns a vector of matched filenames.

Error Handling: If the glob operation fails, we throw a runtime error with an appropriate message using std::strerror to get the error string.

Main Function Logic: It calls the glob function looking for any file containing the letter 'a'. The results are then printed to the console.

Step 5: Compile and Run

Compile the code using g+ + :

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Run the program:

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You should see the output list of files that match your searching criteria.

Conclusion

Using the glob function in C+ + 98 allows you to perform file name pattern matching efficiently on Linux. With this guide, you should now be able to implement and customize your own file searching solutions based on specific patterns. Feel free to experiment with different patterns and modify the code to suit your needs.

By mastering this technique, you’ll enhance your C+ + programming skills while making it easier to manage files in your Linux environment. Happy coding!