How can I find the size of all files located inside a folder?

Question

Is there any API in c++ for getting the size of a specified folder?

If not, how can I get the total size of a folder including all subfolders and files?

Answer 1

You can use "boost::filesystem"

#include 

namespace fs = boost::filesystem;

unsigned long long int get_directory_size(const fs::path& directory){
    if (!fs::exists(directory)) return 0;

    if (fs::is_directory(directory)){
        unsigned long long int ret_size = 0;
        fs::directory_iterator m_dir_itr(directory);

        for (m_dir_itr = fs::begin(m_dir_itr); m_dir_itr != fs::end(m_dir_itr); ++m_dir_itr){
            fs::directory_entry m_dir_entry = *m_dir_itr;
            if (fs::is_regular_file(m_dir_entry.path())){
                ret_size += fs::file_size(m_dir_entry.path());
            }else if (fs::is_directory(m_dir_entry.path())){
                ret_size += get_directory_size(m_dir_entry.path());
            }
        }

        return ret_size;
    } else if (fs::is_regular_file(directory)){
        return fs::file_size(directory);
    }

    return 0;
}

#include 

int main(int /*argc*/, char** /*argv*/) {
    // Assuming 'C:/Folder' be any directory then its size can be found using
    auto folder_size = get_directory_size("C:/Folder");
    printf("Size of 'C:/Folder' is %d\n",folder_size);
    return 0;
}