How do I access an JSON array with boost::property_tree? - 


int main(int argc, char *argv[]) {      qcoreapplication a(argc, argv);      // string s = "{\"age\":23,\"study\":{\"language\":{\"one\":\"chinese\",\"subject\":[{\"one\":\"china\"},{\"two\":\"eglish\"}]}}}";      string s = "{\"age\" : 26,\"person\":[{\"id\":1,\"study\":[{\"language\":\"chinese\"},{\"language1\":\"chinese1\"}],\"name\":\"chen\"},{\"id\":2,\"name\":\"zhang\"}],\"name\" : \"huchao\"}";     ptree pt;     stringstream stream(s);     read_json<ptree>( stream, pt);      int s1=pt.get<int>("age");     cout<<s1<<endl;      string s2 = pt.get<string>("person."".study."".language1");     cout<<s2<<endl;

now want value of language1.

first of all, i've got ask why have list such different elements in it? if language1 has special meaning, split data study , study1 or that. in general, lists should of single type.

assuming can't change format, here answer question. best of knowledge, way out of array iterate on it.

#include <boost/foreach.hpp>  boost_foreach(const ptree::value_type& val, pt.get_child("person.study")) {   boost::optional<string> language1option = v.second.get_optional<string>("language1");   if(language1option) {     cout<<"found language1: "<<*language1option<<endl;   } }

this code iterates on in "study" list , looks entry "language1" key, printing result


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