Listing only folders in directory

Question

I want to list folders in a directory in C++, ideally in a portable (working in the major Operating Systems) way. I tried using POSIX, and it works correctly, but how can i identify whether the found item is a folder?

Answer 1

You could use opendir() and readdir() to list directories and subdirectories. The following example prints all subdirectories inside the current path:

#include <dirent.h> #include <stdio.h>  int main() {     const char* PATH = ".";      DIR *dir = opendir(PATH);      struct dirent *entry = readdir(dir);      while (entry != NULL)     {         if (entry->d_type == DT_DIR)             printf("%s\n", entry->d_name);          entry = readdir(dir);     }      closedir(dir);      return 0; } 

Answer 2

Using the C++17 std::filesystem library:

std::vector<std::string> get_directories(const std::string& s) {     std::vector<std::string> r;     for(auto& p : std::filesystem::recursive_directory_iterator(s))         if (p.is_directory())             r.push_back(p.path().string());     return r; }