CODEWITHSUNDEEP
c++jsonboost
user2997518
user2997518

Reputation: 852

Json array creation using boost c++

I want to print the json array using below code snippet but it is not giving the desired result . Here is the output

{
    "prefix": "standard",
    "faceID": "42"
}

{
    "prefix1": "standard2",
    "faceID2": "44"
}

This is produced by below code snippet:

#include <boost/serialization/string.hpp>
#include <string>
#include <sstream>
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
using boost::property_tree::ptree; 
using boost::property_tree::write_json;

void create_array(ptree parent)
{
    std::stringstream oss;

    write_json(oss,parent);

    std::string serialized_strings(oss.str());

    std::cout << oss.str() << std::endl;
}

int main()                                                                                                                                                                                                 
{   

    ptree pt,pt1;

    pt.put("prefix","standard");
    pt.put("faceID",42);
    create_array(pt);
    pt1.put("prefix1","standard2");
    pt1.put("faceID2",44);
    create_array(pt1); 

}

expected output:

[
{
    "prefix": "standard",
    "faceID": "42"
},

{
    "prefix1": "standard2",
    "faceID2": "44"
}
]

Upvotes: 1

Views: 663

Answers (1)

sehe
sehe

Reputation: 392931

Just to make it absolutely clear:

The documentation states that

The property tree dataset is not typed, and does not support arrays as such. Thus, the following JSON / property tree mapping is used [...]

It continues to describe that each ptree represents a JSON object, always.

You need to remember that Boost Property Tree is not a JSON library. It is a Property Tree library, that optionally uses a subset of JSON for interoperability purposes. Therefore you cannot have arbitrary JSON things: You can not have a top-level arrays, you cannot have lone values, you cannot have actual numeric types, null, booleans etc.

You can only have Property Trees serialized using the described mappings.

Upvotes: 1

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