JsonCpp to parse from url

Question

curl_jsoncpp_example.cpp : https://gist.github.com/connormanning/41efa6075515019e499c

#include <json/json.h>

g++ main.cpp -ljsoncpp -lcurl -o example.out

so error : main.cpp:8:23: fatal error: json/json.h: No such file or directory

server did not support this, so i edited this section

#include <jsoncpp/json/json.h>

And now I'm faced with this error :

In file included from /usr/include/c++/5/cstdint:35:0,
                 from main.cpp:2:
/usr/include/c++/5/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
 #error This file requires compiler and library support \
  ^
main.cpp: In function ‘int main()’:
main.cpp:44:5: error: ‘unique_ptr’ is not a member of ‘std’
     std::unique_ptr<std::string> httpData(new std::string());
     ^
main.cpp:44:32: error: expected primary-expression before ‘>’ token
     std::unique_ptr<std::string> httpData(new std::string());
                                ^
main.cpp:44:60: error: ‘httpData’ was not declared in this scope
     std::unique_ptr<std::string> httpData(new std::string());

I wanted to use this https://linux.tips/programming/how-to-install-and-use-json-cpp-library-on-ubuntu-linux-os But this is only for files inside the server

I want to get the information from a link json that is and print

exampel json link : http://date.jsontest.com

ptint json data ["time"] C++ or C ?

If you are familiar with PHP, this code is simply written :

<?php
$time = json_decode(file_get_contents('http://date.jsontest.com'),true);
echo $time['time']; 
?>

But how to write in C++ or C ?

Please help me

Yes . I've written errors on the top question - You have a good source to get information from a link json api ? — Ehsan
– Ehsan, Commented Apr 25, 2018 at 4:15
1. Learn how to read compiler errors 2. Learn how to use jsoncpp alone 3. Learn how to use libcurl alone 4. Combine 1+2+3 4. PROFIT! — el.pescado - нет войне
– el.pescado - нет войне, Commented Apr 25, 2018 at 9:28

Ehsan · Accepted Answer · 2019-07-04 12:52:07Z

example.cpp :

// telegram : @ELsAnEHSAN - c++ 
// g++ example.cpp -o example -lcurl -ljsoncpp

#include <iostream>
#include <string>
#include <curl/curl.h>
#include <jsoncpp/json/json.h>

static size_t WriteCallback(void *contents, size_t size, size_t nmemb, void *userp)
{
    ((std::string*)userp)->append((char*)contents, size * nmemb);
    return size * nmemb;
}

int main(void)
{
  CURL *curl;
  CURLcode res;
  std::string readBuffer;
  curl = curl_easy_init();
      if(curl) {
            curl_easy_setopt(curl, CURLOPT_URL, "http://date.jsontest.com/");
            curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
            curl_easy_setopt(curl, CURLOPT_WRITEDATA, &readBuffer);
            res = curl_easy_perform(curl);
            curl_easy_cleanup(curl);
      }
    Json::Reader reader;
    Json::Value obj;
    reader.parse(readBuffer, obj); 
    std::cout << obj["time"].asString() << std::endl;
  return 0;
}

If needed :

:~$ sudo apt-get install libcurl-dev
:~$ sudo apt-get install libcurl4-openssl-dev
:~$ sudo apt-get install libcurl4-gnutls-dev
:~$ sudo apt-get install libjson-c-dev
:~$ sudo apt-get install libjsoncpp-dev

compiling : g++ example.cpp -o example -lcurl -ljsoncpp

run : ./example

Ben · Accepted Answer · 2018-04-25 08:41:52Z

0

As S.M mentioned,the error message gives the solution.

Try compiling your program with the: -std=c++11 flag and see if it works.

If it doesn't, please post more code and all the error/warnings you get

answered Apr 25, 2018 at 8:41

Ben

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