c_cpp 迭代目录

Posted 2021-05-14

// Experimental
#include <experimental/filesystem>
namespace fs = std::experimental::filesystem;

const fs::path path = _folder;
for (const auto& entry : fs::directory_iterator(path)) {
    const auto filenameStr = entry.path().filename().string();
    if (fs::is_directory(entry)) {
        std::cout << "dir:  " << filenameStr << '\n';
    }
    else if (fs::is_regular_file(entry)) {
        std::cout << "file: " << filenameStr << '\n';
    }
    else
        std::cout << "??    " << filenameStr << '\n';
}


// C++17 and above
#include <filesystem>
namespace fs = std::filesystem;

const fs::path pathToShow{ argc >= 2 ? argv[1] : fs::current_path() };

for (const auto& entry : fs::directory_iterator(pathToShow)) {
    const auto filenameStr = entry.path().filename().string();
    if (entry.is_directory()) {
        std::cout << "dir:  " << filenameStr << '\n';
    }
    else if (entry.is_regular_file()) {
        std::cout << "file: " << filenameStr << '\n';
    }
    else
        std::cout << "??    " << filenameStr << '\n';
}


// Recursive iterator
void DisplayDirectoryTree(const fs::path& pathToScan, int level = 0) {
    for (const auto& entry : fs::directory_iterator(pathToScan)) {
        const auto filenameStr = entry.path().filename().string();
        if (entry.is_directory()) {
            std::cout << std::setw(level * 3) << "" << filenameStr << '\n';
            DisplayDirectoryTree(entry, level + 1);
        }
        else if (entry.is_regular_file()) {
            std::cout << std::setw(level * 3) << "" << filenameStr
                << ", size " << entry.file_size() << " bytes\n";
        }
        else
            std::cout << std::setw(level * 3) << "" << " [?]" << filenameStr << '\n';
    }
}