Twitter json file parser using boost spirit library

boostparser.cpp

#include <string>
#include <iostream>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <boost/foreach.hpp>

using namespace std;
using namespace boost::property_tree;
const string jsonfile = "./twitter.json";  
/* Below code is only for streamit programming language to get int variables from parsed file. Because Streamit programming language only read int type
struct msg_settings{
    string created_at;			//Variable is for string test
    int64_t id_test; 			//Variable is for int to int64 convert test
    int64_t id_test1; 			//Variable is for int to int64 convert test
    int IDL;				//int64 converted to int 
    int IDU;				//int64 converted to int 
    int in_reply_to_status_id;		//int64
    int in_reply_to_user_id;		//int64
    int retweet_count;			//int

    int user_idl;				//int64 converted to int 
    int user_idu;				//int64 converted to int 
    int user_followers_count;		//int
    int user_friends_count;			//int
    int user_favourites_count;		//int
    int user_statuses_count;		//int

    void parse(const string &filename);
};
*/
void msg_settings::parse(const string &filename)
{  
    ptree pt;
    read_json( jsonfile, pt );
    BOOST_FOREACH( ptree::value_type const& rowPair, pt.get_child( "" ))
    {
        //Individual messages
        cout << rowPair.first << ": " <<pt.get<string>(rowPair.first)<<endl;
        BOOST_FOREACH( ptree::value_type const& itemPair, rowPair.second )
        {
            //nested messages
            cout << "\t" << itemPair.first << ": ";
            cout << itemPair.second.get_value<string>() <<" ";
            
            BOOST_FOREACH( boost::property_tree::ptree::value_type const& node, itemPair.second )
            {
                std::cout << node.second.get_value<std::string>() << " ";
            }
            cout << endl;
        }
        cout << endl;
    }
}


int main()
{
    try
    {
        msg_settings msg;
        msg.parse(jsonfile);
        cout<<"Success\n";
    }
    catch(exception &e)
    {
        cout<<"Error: "<<e.what()<<"\n";
    }
    return 0;
}