getting error terminate called after throwing an instance of 'std::domain_error' what(): cannot use at() with string

[Munodiwa]

After performing a http get request I receive a json string containing a string. I need to access the link inside this json string. I am using ubuntu. I downloaded the package with the cmd line sudo apt-get install nlohmann-json-dev

#include <stdio.h>
#include <stdlib.h>
#include "json.hpp"
#include <curl/curl.h>
#include

using nlohmann::json;

int main()
{
curl_global_init( CURL_GLOBAL_ALL );
CURL * myHandle;
CURLcode result; // We’ll store the result of CURL’s webpage retrieval, for simple error checking.
myHandle = curl_easy_init ( ) ;
// Notice the lack of major error checking, for brevity
curl_easy_setopt(myHandle, CURLOPT_URL, "https://matiusulung.com/se.json");
result = curl_easy_perform( myHandle);
json object = "(result)";
std::cout<<object.at("link").getstd::string();
curl_easy_cleanup( myHandle );
printf("LibCurl rules!\n");
return 0;

}

[nlohmann]

What’s the JSON you pass to the server?

[Munodiwa]

this is the json I receive from the server {"link": "ec2-3-121-209-122.eu-central-1.compute.amazonaws.com"} which is the one I am storing in json object

[nlohmann]

Which version of the library are you using?

[nickaein]

This line

json object = "(result)";

creates an JSON object with value type of string. Shouldn't it be

json object = json::parse(result);

instead?

[nlohmann]

@nickaein is right - you created a string with json object = "(result)";, and the error message makes sense: cannot use at() with string.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.