MFC, C++ - Logging, best way

Question

I am looking for the best way to add logging to my application.

What must it be able to do? Configuration of where the files are stored.

• 2025-03-06-LogFile.log

If the file is larger than 30000 MByte, a new one should be written. Files older than 30 days should be deleted each time the application is started.

Log Level

• Error
• Debug
• Info

Thanks.

Answer 1

Hi,

This problem is not related to MFC.
C++ standard library only provides simple I/O functions.

According to your requirements, it is recommended to search for Log-related open-source libraries on GitHub.
It's easy to find some sample.

console_sink->set_level(spdlog::level::warn);

 // Create a file rotating logger with 5 MB size max and 3 rotated files
    auto max_size = 1048576 * 5;
    auto max_files = 3;
    auto logger = spdlog::rotating_logger_mt("some_logger_name", "logs/rotating.txt", max_size, max_files);
}

// Create a daily logger - a new file is created every day at 2:30 am

auto logger = spdlog::daily_logger_mt("daily_logger", "logs/daily.txt", 2, 30);

Since Q&A does not provide support on how to use third-party libraries, for questions about these libraries, you can seek help on GitHub or StackOverflow.

Best regards,

Minxin Yu

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