代码
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 #include <ctime>
 #include <iostream>
 #include <filesystem>
 
 
 
 
 
 
 int main()
 {
 namespace fs = std::filesystem;
 
 auto testdir = fs::path("f:/testdir");
 
 if (!fs::exists(testdir))
 {
 std::cout << "file or directory is not exists!" << std::endl;
 }
 
 
 
 
 fs::directory_options opt(fs::directory_options::none);
 
 fs::directory_entry dir(testdir);
 
 std::cout << "show:\t" << dir.path().filename() << std::endl;
 for (fs::directory_entry const& entry : fs::directory_iterator(testdir, opt))
 {
 if (entry.is_regular_file())
 {
 std::cout << entry.path().filename()
 << "\t size: " <<  entry.file_size()  << std::endl;
 }
 else if (entry.is_directory())
 {
 std::cout << entry.path().filename()
 << "\t dir" << std::endl;
 }
 }
 std::cout << std::endl;
 std::cout << std::endl;
 
 
 std::cout << "show all:\t" << dir.path().filename() << std::endl;
 for (fs::directory_entry const& entry : fs::recursive_directory_iterator(testdir, opt))
 {
 if (entry.is_regular_file())
 {
 
 std::cout << entry.path().filename()
 << "\t size: " << entry.file_size() << "\t parent: " << entry.path().parent_path() << std::endl;
 }
 else if (entry.is_directory())
 {
 std::cout << entry.path().filename()
 << "\t dir" << std::endl;
 }
 }
 return 0;
 }
 
 | 
参考
https://zh.cppreference.com/w/cpp/filesystem
中文版
https://zh.cppreference.com/w/cpp/filesystem