Re: [Boost-users] [property_tree] Parsing JSON

Subject: Re: [Boost-users] [property_tree] Parsing JSON
From: Brian Budge (brian.budge_at_[hidden])
Date: 2010-12-28 20:08:28

Hi -

I don't have the code in front of me, but we had to modify the grammar for
the JSON parser in boost property_tree in order to read top-level groups.
If you're familiar with boost spirit, I think it's not too much work.

  Brian

On Mon, Dec 27, 2010 at 11:14 AM, Olivier Tournaire <olitour_at_[hidden]>wrote:

> Hi all,
>
> I am currently trying to parse a JSON file, but cannot figure how to
> achieve this task (see for instance
> http://ax.itunes.apple.com/WebObjects/MZStoreServices.woa/wa/wsSearch?term=sudoku&entity=software&limit=1
> ).
> Here is a piece of code:
>
>   #ifndef ITUNES_JSON_STRUCTURE_HPP
>
> #define ITUNES_JSON_STRUCTURE_HPP
>
>  #include <boost/property_tree/ptree.hpp>
>
>  #include <string>
>
>  class itunes_json_structure
>
> {
>
> public:
>
>     void load(const std::string &filename);
>
>      boost::property_tree::ptree m_ptree;
>
> };
>
>  #endif // ITUNES_JASON_STRUCTURE_HPP
>
>
>
> #include "itunes_jason_structure.hpp"
>
>  #include <boost/property_tree/json_parser.hpp>
>
>  #include <iostream>
>
>  using namespace std;
>
>  void itunes_json_structure::load(const string &filename)
>
> {
>
>     using boost::property_tree::ptree;
>
>     try
>
>     {
>
>         // Load the JSON file into the property tree. If reading fails
>
>         // (cannot open file, parse error), an exception is thrown.
>
>         read_json(filename, m_ptree);
>
>          cout << "resultCount = " << m_ptree.get<string>("resultCount") << endl;
>
>         ptree all_results = m_ptree.get_child("results");
>
>         // HERE!!! How can I read the content of the "results" node????
>
>     }
>
>     catch(exception &e)
>
>     {
>
>         throw e;
>
>     }
>
> }
>
>
> I am unable to read the content of the "results" node. Could you please
> give me some help?
>
> Regards,
>
> Olivier
>
>
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