examples/c++/example2.cpp

/* ----------------------------------------------------------------------------
   libconfig - A library for processing structured configuration files
   Copyright (C) 2005-2010  Mark A Lindner

   This file is part of libconfig.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public License
   as published by the Free Software Foundation; either version 2.1 of
   the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, see
   <http://www.gnu.org/licenses/>.
   ----------------------------------------------------------------------------
*/

#include <iostream>
#include <iomanip>
#include <cstdlib>
#include <libconfig.h++>

using namespace std;
using namespace libconfig;

// This example reads the configuration file 'example.cfg', adds a new
// movie record to the movies list, and writes the updated configuration to
// 'updated.cfg'.

int main(int argc, char **argv)
{
  static const char *output_file = "updated.cfg";

  Config cfg;

  cfg.setOptions(Config::OptionFsync
                 | Config::OptionSemicolonSeparators
                 | Config::OptionColonAssignmentForGroups
                 | Config::OptionOpenBraceOnSeparateLine);

  // Read the file. If there is an error, report it and exit.
  try
  {
    cfg.readFile("example.cfg");
  }
  catch(const FileIOException &fioex)
  {
    std::cerr << "I/O error while reading file." << std::endl;
    return(EXIT_FAILURE);
  }
  catch(const ParseException &pex)
  {
    std::cerr << "Parse error at " << pex.getFile() << ":" << pex.getLine()
              << " - " << pex.getError() << std::endl;
    return(EXIT_FAILURE);
  }

  // Find the 'movies' setting. Add intermediate settings if they don't yet
  // exist.
  Setting &root = cfg.getRoot();

  if(! root.exists("inventory"))
    root.add("inventory", Setting::TypeGroup);

  Setting &inventory = root["inventory"];

  if(! inventory.exists("movies"))
    inventory.add("movies", Setting::TypeList);

  Setting &movies = inventory["movies"];

  // Create the new movie entry.
  Setting &movie = movies.add(Setting::TypeGroup);

  movie.add("title", Setting::TypeString) = "Buckaroo Banzai";
  movie.add("media", Setting::TypeString) = "DVD";
  movie.add("price", Setting::TypeFloat) = 12.99;
  movie.add("qty", Setting::TypeInt) = 20;

  // Write out the updated configuration.
  try
  {
    cfg.writeFile(output_file);
    cerr << "Updated configuration successfully written to: " << output_file
         << endl;

  }
  catch(const FileIOException &fioex)
  {
    cerr << "I/O error while writing file: " << output_file << endl;
    return(EXIT_FAILURE);
  }

  return(EXIT_SUCCESS);
}

// eof