how to get "users_list" from this json response using boost package

Question

i am currently working in c++ for call application.i have one json response as string.i want to parse the json data. i have used boost packages for get json data. I want to take the users_list key from the json using boost.please reply the steps. thanks in advance.....

{"action":"refresh_dashboard","data":{"users_list":[{"user_id":"901e6076ff351cfc2195fb86f8438a26","extensions":["1002"],"name":"Karthik M"},{"user_id":"7d617ef5b2390d081d901b0d5cd108eb","extensions":["1015"],"name":"Synway User2"},{"user_id":"c8f667f7d663e81f6e7fa34b9296f067","extensions":["1012"],"name":"Rahib Video"},{"user_id":"cc3f94ecc14ee9c55670dcde9adc1887","extensions":["1006"],"name":"Rounak S Kiran"},{"user_id":"6c29ebdb34e1761fdf9423c573087979","extensions":["1003"],"name":"Amar Nath"},{"user_id":"8e15c2d95d4325cb07f0750846966be8","extensions":["1011"],"name":"TLS User"},{"user_id":"2fc4142bdacf83c1957bda0ad9d50e3d","extensions":["1014"],"name":"Synway User1"},{"user_id":"74d5b5a9aca1faa4c2f217ce87b621d8","extensions":["1008"],"name":"Robin Raju"},{"user_id":"a7ad7e73bf93ea83c8efdc1723cba198","extensions":["1007"],"name":"Arshad Arif"},{"user_id":"b55146df593ec8d09e5fe12a8a4c1108","extensions":["1001"],"name":"Rahib Rasheed"},{"user_id":"391391de005a8f5403c7b5591f462ea1","extensions":["1013"],"name":"Sangeeth J"},{"user_id":"3258f7ae4ae1db60435cbcf583f64a89","extensions":["1009"],"name":"Aby TL"},{"user_id":"90bc84e5e8a3427fe35e99bd4386de95","extensions":["1010"],"name":"Prince T"},{"user_id":"b501ef5b270a196afc0eed557ca74237","extensions":["1005"],"name":"Jineed AJ"},{"user_id":"1422af351e06adeab2de92f5a633a444","extensions":["1004"],"name":"Ashok PA"}],"busy_users":[],"reg_users":[{"user_id":"901e6076ff351cfc2195fb86f8438a26","status":"registered"},{"user_id":"6c29ebdb34e1761fdf9423c573087979","status":"registered"}],"contacts":[{"owner_id":"901e6076ff351cfc2195fb86f8438a26","status":"ready"},{"owner_id":"6c29ebdb34e1761fdf9423c573087979","status":"ready"}]}}

Sorry to say that, but this is not how this site works. You need to show what you have done before we can help you. — Amadeus, Mar 16 '18 at 13:54
std::istringstream is(ss); ptree pt; read_json(is, pt); std::cout <<"\n 1st"<< "action: " << pt.get("action") << "\n"; std::cout << "\n 1st" << "action: " << pt.get("") << "\n"; for (auto& e : pt.get_child("users_list")) { std::cout << "\n" << "users id " << e.second.get("user_id") << "\n"; } — Prince, Mar 16 '18 at 13:54
@Amadeus. i have commented my code. i can take "action" but unable to take "users_list". please help — Prince, Mar 16 '18 at 13:56
Please, read this: https://stackoverflow.com/help/how-to-ask — Amadeus, Mar 16 '18 at 13:57
@Amadeus.in my case, data":{"users_list":[{"user_id","sdsd" } ."userid" i want to take.if that userlist is not there,it will be easy to get that array — Prince, Mar 16 '18 at 14:17

score 0 · Answer 1 · answered Mar 16 '18 at 14:01

0

There are several C++ libraries out there which will help you parse json string. You could use jsoncpp. Then you can write something like:

Json::Value data;
Json::CharReaderBuilder reader;
std::string errs;
std::stringstream ss;
ss << inp_string;

if (Json::parseFromStream(reader, ss, &data, &errs))
{
    const Json::Value users_list = data["data"];
}

Use asString() method or something similar to extract fields from the users_list as a string.

answered Mar 16 '18 at 14:01

skr

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i have used jsoncpp . i have added packages from nuget.but after the build showing some build errors. That's the reason why i am using boost. – Prince Mar 16 '18 at 14:07
sir did you used boost . – Prince Mar 16 '18 at 14:09
I don't think `boost` was specifically mentioned while I was writing the answer. Sorry if I missed it. – skr Mar 16 '18 at 14:10
No, I haven't used `boost` for parsing `json`. – skr Mar 16 '18 at 14:10
i have tried this post.but in my case it is little difficult.https://stackoverflow.com/questions/31345401/parse-json-array-as-stdstring-with-boost-ptree – Prince Mar 16 '18 at 14:12
@skr_robo.please check this – Prince Mar 16 '18 at 14:12
Please provide more details about the "difficulty" you are facing. – skr Mar 16 '18 at 14:14
in my case, data":{"users_list":[{"user_id","sdsd" } ."userid" i want to take.if that userlist is not there,it will be easy to get that array – Prince Mar 16 '18 at 14:16

score 0 · Accepted Answer · answered Mar 16 '18 at 14:26

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

using boost::property_tree::ptree;

int main() {
    std::string ss = "{ \"action\" : \"refresh_dashboard\", \"data\" : [{ \"user_id\" : \"901e6076ff351cfc2195fb86f8438a26\" }, { \"user_id\" : \"901e6076ff351cfc2195fb86f8438a26\" }, { \"data\" : \"901e6076ff351cfc2195fb86f8438a26\" }] }";

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

    std::cout << "id:     " << pt.get<std::string>("action") << "\n";

    for (auto& e : pt.get_child("data")) {
        std::cout << "stuff name: " << e.second.get<std::string>("user_id") << "\n";
    }
}

this case i can parse the data.but this is not my actual responses. — Prince, Mar 16 '18 at 14:27

how to get "users_list" from this json response using boost package

2 Answers2