How to parse json data from cpprestsdk

Question

return client.request(methods::GET).then([](http_response response) -> pplx::task<json::value>
{
    if (response.status_code() == status_codes::OK)
    {
        std::cout << "status ok";
        response.headers().set_content_type(L"application/json");

        return response.extract_json();
    }

    // Handle error cases, for now return empty json value... 


    std::cout << "get json data";

    return pplx::task_from_result(json::value());
})
    .then([](pplx::task<json::value> previousTask)
{
    try
    {
        std::cout << "parse json data";

        const json::value& v = previousTask.get();


        utility::string_t jsonval = v.serialize();

        json::value root;

    //  DisplayJSONValue(v);

       wcout << jsonval;
    //   wcout<<jsonval.data.id;
        // Perform actions here to process the JSON value...

        //std::cout << v;

        //IterateJSONValue();


    }
    catch (const http_exception& e)
    {
        // Print error.
        wostringstream ss;
        ss << e.what() << endl;
        wcout << ss.str();
    }
});

}

please help me.thanks in advance.i got api responses.but i cant parse the responses .I can able to call and take the api responses .but not able to parse the responses. Any steps to parse the json data ,please help me.

MY API RESPONSES

{"offset":0,"rows":[{"id":"1f960b4aa0a7f4e41868d6d9d513ecf8","key":"ABDALLA ELKADY CPA","value":["c1d148.aa.ss.com","53fbbfd1aae9f3b82c89235b8e6bcac28e7a06da1b8aa3ab9164555e543b6f8f"]},{"id":"7ba219914965b79a4a2d9f27d06f1644","key":"callvox","value":["a03096.aa.ss.com","e98cdb61030376461cd75108d082b9e8c5f024b068a3e734744b974442e1cd26"]},{"id":"6ac7f0a7c4affee980a4d5b9b95d6b44","key":"cloudgen","value":["ce39a9.ss.ss.com","f9d507e0ad4b70dbe51d900c2a1aa730eae57d042e805ccf54e153879abe4003"]}

if you got any solution let me know sir. – Sangeeth John Mar 06 '18 at 07:24 — Sangeeth John, Mar 06 '18 at 07:24
I want to take id from rows.any solution. – Prince Mar 06 '18 at 07:31 — Prince, Mar 06 '18 at 07:31

score 5 · Answer 1 · edited May 11 '22 at 15:10

try
{
    std::cout << "parse json data";
    const json::value& v = previousTask.get();
    utility::string_t jsonval = v.serialize();
    wcout << jsonval;
    auto array = v.at(U("rows")).as_array();
    for (int i = 0; i<array.size(); ++i)
    {
        auto id = array[i].at(U("id")).as_string();
        std::wcout <<"\n"<< id;
        auto key = array[i].at(U("key")).as_string();
        std::wcout <<"\n"<< key;
        auto array2=array[i].at(U("value")).as_array();

        std::wcout << array2[0] << array2[1];
    }
}
catch (const http_exception& e)
{
    wostringstream ss;
    ss << e.what() << endl;
    wcout << ss.str();
}

Above solution work for me.

Thanks for the `wcout`, helped a lot. – Rabbi Shuki Gur May 07 '19 at 09:10 — Rabbi Shuki Gur, May 07 '19 at 09:10

score 2 · Answer 2 · answered Mar 06 '18 at 07:58

2

what about this?

const json::value& v = previousTask.get();
auto a = v[L"rows"].as_array();
for (auto i= a.begin();i!=a.end();i++)
{
auto id = (*i)[L"ID"]
}

answered Mar 06 '18 at 07:58

zapredelom

1,009
1
11
28

.can you share your skype id. my skype id prince tomy. – Prince Mar 06 '18 at 09:01
.sir your skype id – Prince Mar 06 '18 at 09:02
can you please put the whole error message, on which line exactly the error appears? – zapredelom Mar 06 '18 at 10:02

score 1 · Answer 3 · answered Mar 06 '18 at 07:39

1

Try This

auto array = json.at(U("devices")).as_array();
for(int i=0; i<array.size(); ++i)
{
     auto id = array[i].at(U("id")).as_string();
     auto type = array[i].at(U("type")).as_string();
}

answered Mar 06 '18 at 07:39

Sangeeth John

330
1
10

oooh, sorry keep trying. – Sangeeth John Mar 06 '18 at 07:42

How to parse json data from cpprestsdk

3 Answers3