Error in parse_into() Error: unknown name or Error: incomplete JSON

[ismaelbonato]

Hello,

I`m trying to deserialize a json file in a structure, it compiles but when a run the code bellow I get the follow error.

error or GCC 11.4

Error: unknown name [boost.json:39 at xxxx/parse_into.hpp:1144:13 in function 'bool boost::json::detail::converting_handler<boost::json::detail::described_class_conversion_tag, V, P>::on_key(boost::system::error_code&, boost::json::string_view)']

Error on GCC 12.3

Error: incomplete JSON [boost.json:3 at xxxxx/json/basic_parser_impl.hpp:2901:17 in function 'std::size_t boost::json::basic_parser<Handler>::write_some(bool, const char*, std::size_t, boost::system::error_code&)']

Thanks for any help.

Boost_VERSION is 1.85.0

CMake VERSION is 3.27

g++ (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0 & 12.3.0

Steps necessary to reproduce the problem

my json file:

{
    "Interface": "wlp0s20f3",
    "Devices": [
        {
            "name": "Wemo",
            "type": "locker",
            "file": "wemo.xml",
            "port": 43450,
            "action": "echo teste"
        },
        {
            "name": "Wemo2",
            "type": "locker",
            "file": "wemo.xml",
            "port": 43450,
            "action": "echo teste"
        }
    ]
}

---

the code

#include <fstream>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>

#include <boost/json/src.hpp>
#include <boost/json.hpp>
#include <boost/describe/class.hpp>

struct Dev {
    std::string name;
    std::string type;
    std::string file;
    unsigned int port;
    std::string action;
};

BOOST_DESCRIBE_STRUCT(Dev, (), (name, type, file, port, action))

struct configuration {
    std::string interface;
    std::vector<Dev> devList;
};

BOOST_DESCRIBE_STRUCT(configuration, (), (interface, devList))

void func()
{
    std::ifstream file("../AlexaWemoEmulator/config.json");

    try {
        std::string json( std::istreambuf_iterator<char>( file ), std::istreambuf_iterator<char>{} );

        configuration config;
        boost::system::error_code ec;
        boost::json::parse_into( config, json, ec );

        if( ec.failed() )
        {
            std::cout << "Error: " << ec.what() << std::endl;
        }

        std::cout << "---------------" << config.interface << std::endl;

    }
    catch(const std::exception& e)
    {
        std::cerr << e.what() << '\n';
    }
}

---

[pdimov]

The names in your struct configuration (interface and devList) do not match the keys in your JSON (Interface and Devices.) It works if they are changed to match: https://godbolt.org/z/7ffh4zWKh

Also, you don't need these includes

#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>

[ismaelbonato]

The names in your struct configuration (interface and devList) do not match the keys in your JSON (Interface and Devices.) It works if they are changed to match: https://godbolt.org/z/7ffh4zWKh

Also, you don't need these includes

#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>

Thank you very much, sorry for not paying attention to this silly error, you helped me a lot.