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

Subject: Re: [Boost-users] [property_tree] Parsing JSON
From: Olivier Tournaire (olitour_at_[hidden])
Date: 2010-12-31 06:30:40

Ok, thank you. I am however not familiar with Spirit. I was expected that thé parser works out of thé box. If you hAve a pièce of code it Will be really helpful

Regards

Olivier

Envoyé de mon iPhone

Le 29 déc. 2010 à 02:08, Brian Budge <brian.budge_at_[hidden]> a écrit :

> 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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