Simple example of parsing and consuming JSON array with boost::property_tree

boost_property_tree_json_array.cpp

#ifdef _MSC_VER
#include <boost/config/compiler/visualc.hpp>
#endif
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <boost/foreach.hpp>
#include <cassert>
#include <exception>
#include <iostream>
#include <sstream>
#include <string>

int main()
{
    try
    {
        std::stringstream ss;
        ss << "{ \"root\": { \"values\": [1, 2, 3, 4, 5 ] } }";

        boost::property_tree::ptree pt;
        boost::property_tree::read_json(ss, pt);

        BOOST_FOREACH(boost::property_tree::ptree::value_type &v, pt.get_child("root.values"))
        {
            assert(v.first.empty()); // array elements have no names
            std::cout << v.second.data() << std::endl;
        }
        return EXIT_SUCCESS;
    }
    catch (std::exception const& e)
    {
        std::cerr << e.what() << std::endl;
    }
    return EXIT_FAILURE;
}

@santoshkamblecpp The https://www.boost.org/doc/libs/1_74_0/doc/html/property_tree/parsers.html says

JSON values are mapped to nodes containing the value. However, all type information is lost; numbers, as well as the literals "null", "true" and "false" are simply mapped to their string form.

Thus, write your own serialising function (or search the StackOverflow) or use different library (e.g. https://github.com/boostorg/json)

@santoshkamblecpp The https://www.boost.org/doc/libs/1_74_0/doc/html/property_tree/parsers.html says

JSON values are mapped to nodes containing the value. However, all type information is lost; numbers, as well as the literals "null", "true" and "false" are simply mapped to their string form.

Thus, write your own serialising function (or search the StackOverflow) or use different library (e.g. https://github.com/boostorg/json)

Thank you!

Hi there,
I am searching 1.instrument_name, 2.bids, 3.asks from json below:

{"jsonrpc":"2.0","method":"subscription","params":{"channel":"book.BTC-PERPETUAL.raw","data":{"type":"change","timestamp":1635513739435,"prev_change_id":6807100702,"instrument_name":"BTC-PERPETUAL","change_id":6807100703,"bids":[["new",60772.0,50.0]],"asks":[]}}}

have there any iteration for these three fields?
like I am still confusing because I use your example code.

Thanks in advance.