C++ 文件系统笔记

贡献者： addis

#include <iostream>
#include <filesystem>
#include <fstream>

namespace fs = std::filesystem;

int main() {
    // Define a path for a new directory and a file inside it
    fs::path dirPath = "example_dir";
    fs::path filePath = dirPath / "example_file.txt";

    // 1. Create a directory
    if (!fs::exists(dirPath)) {
        fs::create_directory(dirPath);
        std::cout << "Directory created: " << dirPath << std::endl;
    }

    // 2. Create a file and write to it
    std::ofstream file(filePath);
    if (file.is_open()) {
        file << "This is a sample file.\\n";
        file.close();
        std::cout << "File created and written to: " << filePath << std::endl;
    } else {
        std::cerr << "Failed to create the file!" << std::endl;
    }

    // 3. Check file properties
    if (fs::exists(filePath)) {
        std::cout << "File exists: " << filePath << std::endl;
        std::cout << "File size: " << fs::file_size(filePath)
            << " bytes" << std::endl;
    }

    // 4. Copy the file to a new location
    fs::path copiedFilePath = dirPath / "copied_file.txt";
    fs::copy(filePath, copiedFilePath);
    std::cout << "File copied to: " << copiedFilePath << std::endl;

    // 5. Rename the copied file
    fs::path renamedFilePath = dirPath / "renamed_file.txt";
    fs::rename(copiedFilePath, renamedFilePath);
    std::cout << "File renamed to: " << renamedFilePath << std::endl;

    // 6. Delete the original file
    fs::remove(filePath);
    std::cout << "Original file deleted: " << filePath << std::endl;

    // 7. Remove the directory and all contents
    fs::remove_all(dirPath);
    std::cout << "Directory and all contents removed: "
        << dirPath << std::endl;

    return 0;
}