Parse JSON array as std::string with Boost ptree

Question

I have this code that I need to parse/or get the JSON array as std::string to be used in the app.

std::string ss = \"{ \\\"id\\\" : \\\"123\\\", \\\"number\         


        

Answer 1

Arrays are represented as child nodes with many "" keys:

docs

• JSON arrays are mapped to nodes. Each element is a child node with an empty name. If a node has both named and unnamed child nodes, it cannot be mapped to a JSON representation.

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#include 
#include 

using boost::property_tree::ptree;

int main() {
    std::string ss = "{ \"id\" : \"123\", \"number\" : \"456\", \"stuff\" : [{ \"name\" : \"test\" }, { \"name\" : \"some\" }, { \"name\" : \"stuffs\" }] }";

    ptree pt;
    std::istringstream is(ss);
    read_json(is, pt);

    std::cout << "id:     " << pt.get("id") << "\n";
    std::cout << "number: " << pt.get("number") << "\n";
    for (auto& e : pt.get_child("stuff")) {
        std::cout << "stuff name: " << e.second.get("name") << "\n";
    }
}

Prints

id:     123
number: 456
stuff name: test
stuff name: some
stuff name: stuffs