libs/filesystem/example/tut4.cpp

//  filesystem tut4.cpp  ---------------------------------------------------------------//
//  Copyright Beman Dawes 2009
//  Distributed under the Boost Software License, Version 1.0.
//  See http://www.boost.org/LICENSE_1_0.txt
//  Library home page: http://www.boost.org/libs/filesystem
#include <iostream>
#include <vector>
#include <algorithm>
#include <boost/filesystem.hpp>
using std::cout;
using namespace boost::filesystem;
int main(int argc, char* argv[])
{
  if (argc < 2)
  {
    cout << "Usage: tut4 path\n";
    return 1;
  }
  path p (argv[1]);
  try
  {
    if (exists(p))
    {
      if (is_regular_file(p))
        cout << p << " size is " << file_size(p) << '\n';
      else if (is_directory(p))
      {
        cout << p << " is a directory containing:\n";
        std::vector<std::string> v;
        for (auto&& x : directory_iterator(p))
          v.push_back(x.path().filename().string()); 
        std::sort(v.begin(), v.end());  
        for (auto&& x : v)
          cout << "    " << x << '\n';
      }
      else
        cout << p << " exists, but is not a regular file or directory\n";
    }
    else
      cout << p << " does not exist\n";
  }
  catch (const filesystem_error& ex)
  {
    cout << ex.what() << '\n';
  }
  return 0;
}