Fixer: currency rates api ; demo using C++ with Boost

main.cpp

#include <boost/asio.hpp>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <boost/filesystem.hpp>
#include <iostream>
#include "apiKey.h"
using namespace boost::asio::ip;
using namespace boost::asio;
using namespace std;
using namespace boost::filesystem;        
namespace pt = boost::property_tree;

int main() {
    const string rest_api_server_host = "data.fixer.io";
    const string port = "80";
    const string data_path = "data/data.json";
    path my_path(data_path);

    boost::system::error_code ec;
    io_service svc;
    tcp::resolver resolver(svc);
    tcp::resolver::query query(rest_api_server_host, port);
    tcp::resolver::iterator iter = resolver.resolve(query);
    tcp::endpoint endpoint = iter->endpoint();
    tcp::socket sock(svc);
    sock.connect(endpoint);

    // RESTful GET
    string request("GET /api/latest?access_key="+ apiKeyVault::get_apiKey() +"&format=1\r\n\r\n");
    sock.send(buffer(request));

    // read response
    string response;
    do {
        char buf[1024];
        size_t bytes_transferred = sock.receive(buffer(buf), {}, ec);
        if (!ec) {            
            response.append(buf, buf + bytes_transferred);
        }
    } while (!ec);

    // list out what we get
    // cout << "Response received: '" << response << "'\n";
    cout << "Data received." << endl;

    remove_all("data");
    create_directory("data");
    std::ofstream file( "data/data.json" );
    file << response;
    file.close();
    if ( !exists( "data/data.json" ) )
        cout << "new data has been updated.\n";


    // Create a root
    pt::ptree root;

    // Load the json file in this ptree
    pt::read_json("data/data.json", root);
}