Boost Iostream reading many files in a folder

[Noobscratcher]

Hello I'm trying to read a folder for its files using boost iostreams

this is my current code

   typedef ex::container_source<string> 
                        string_source;

                          string                     input = "hello";
                          string                     output;
                          io::stream<string_source>  in(input);
                          getline(in, output);
                          assert(input == output);

                          cout << output << endl;

but I don't know what code to add to make it read a bunch of files in a folder of a certain extension specified like .obj.

[Stewbond]

I don't know much about boost::iostream, but here's something from boost::filesystem that is simple and does what your asking.

#include <boost/filesystem.hpp>
#include <iostream>
namespace fs = boost::filesystem;
int main()
{
    fs::path someDir("c:\\Windows\\System32");
    fs::directory_iterator end_iter;

    for (fs::directory_iterator dir_iter(someDir); dir_iter != end_iter; ++dir_iter)
        if (dir_iter->path().extension() == ".dll")
            std::cout << dir_iter->path().leaf() << std::endl;

    return 0;
}

[Noobscratcher]

I tried

namespace fs = boost::filesystem;

 fs::path someDir("textfolder");
    fs::directory_iterator end_iter;

    for (fs::directory_iterator dir_iter(someDir); dir_iter != end_iter; ++dir_iter)
        if (dir_iter->path().extension() == ".txt")
            std::cout << dir_iter->path().leaf() << std::endl;

and it didn't cout anything to cmd ? what could it be the folder name or something I'm missing in the code

[Stewbond]

If textfolder is a folder in your current directory then use: "./textfolder" instead. The ./ means current directory. ../ means directory above. if you have just / that is the root directory in unix/linux.