c++17中std::filesystem库的用法_c++17文件系统操作与路径管理示例

#include <filesystem>
#include <iostream>

namespace fs = std::filesystem;

int main() {
    fs::path p = "/home/user/documents/report.txt";

    std::cout << "文件名: " << p.filename() << '\n';         // report.txt
    std::cout << "文件名无扩展: " << p.stem() << '\n';       // report
    std::cout << "扩展名: " << p.extension() << '\n';        // .txt
    std::cout << "父目录: " << p.parent_path() << '\n';     // /home/user/documents

    fs::path new_path = p.parent_path() / "image.jpg";
    std::cout << "新路径: " << new_path << '\n';
}

fs::path test_file = "example.txt";

if (fs::exists(test_file)) {
    if (fs::is_regular_file(test_file)) {
        std::cout << "文件大小: " << fs::file_size(test_file) << " 字节\n";
    }
} else {
    std::cout << "文件不存在\n";
}

fs::path dir = ".";

for (const auto& entry : fs::directory_iterator(dir)) {
    if (fs::is_regular_file(entry.status())) {
        std::cout << "[文件]  " << entry.path().filename() << '\n';
    } else if (fs::is_directory(entry.status())) {
        std::cout << "[目录]  " << entry.path().filename() << '\n';
    }
}

for (const auto& entry : fs::recursive_directory_iterator(dir)) {
    std::cout << entry.path() << '\n';
}

// 创建多级目录
fs::create_directories("data/temp/cache");

// 删除整个目录树
fs::remove_all("data/temp");

// 重命名文件
fs::rename("old_name.txt", "new_name.txt");