How to use libcurl with this request and get json server answer c++?

Question

I have some requests and i want to usen them in libcurl. But i dont know how to do this So whot should i do implemete this in code like "curl.get(dsds) curl.header("", "")"

curl "https://pterodactyl.file.properties/api/client/account" \
  -H 'Accept: application/json' \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer apikey' \
  -X GET \

curl "https://pterodactyl.file.properties/api/client/account/email" \
  -H 'Accept: application/json' \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer apikey' \
  -X PUT \
  -d '{
  "email": "example@xample.com",
  "password": "Password"
}' 

curl "https://pterodactyl.file.properties/api/client/account/api-keys" \
  -H 'Accept: application/json' \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer apikey' \
  -X POST \
  -d '{
  "description": "Restricted IPs",
  "allowed_ips": ["127.0.0.1", "192.168.0.1"]
}' 

curl "https://pterodactyl.file.properties/api/client/account/api-keys/NWKMYMT2Mrav0Iq2" \
  -H 'Accept: application/json' \
  -H 'Content-Type: application/json' \
  -H 'Authorization: Bearer apikey' \
  -X DELETE \

Create a program that either compiles libcurl or links against it, then read through the documentation and samples to learn how to make those requests. They aren't difficult, but if you run into issues you can ask those specific questions here. — Retired Ninja, Jun 19 '21 at 11:24

Dusan Todorovic · Accepted Answer · 2021-06-19T12:11:48.653

1

Basic function for downloading something from web is

#include <iostream>
#include<curl/curl.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;
}
std::string curlDownload(std::string link){
    CURL* curl;
    CURLcode res;
    std::string readBuffer;
    curl = curl_easy_init();
    if (curl) {
        curl_easy_setopt(curl, CURLOPT_URL, link.c_str());
        curl_easy_setopt(curl, CURLOPT_USERNAME, "myUserName"); //auth for userName
        curl_easy_setopt(curl, CURLOPT_PASSWORD, "Password"); //auth for password
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &readBuffer);
        res = curl_easy_perform(curl);
        curl_easy_cleanup(curl);
    }
    return readBuffer;
}
int main() {

    std::string myLink = "https://pterodactyl.file.properties/api/client/account";
    std::cout << curlDownload(myLink) << std::endl; //this will print your request for authorization

    return 0;
}

In order to put stuff you will need something like this, with your own data ofcourse

curl = curl_easy_init();

if (curl) {
    headers = curl_slist_append(headers, client_id_header);
    headers = curl_slist_append(headers, "Content-Type: application/json");

    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers); 
    curl_easy_setopt(curl, CURLOPT_URL, request_url);  
    curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "PUT"); /* !!! */

    curl_easy_setopt(curl, CURLOPT_POSTFIELDS, json_struct); /* data goes here */

    res = curl_easy_perform(curl);

    curl_slist_free_all(headers);
    curl_easy_cleanup(curl);
}

More about put here and here

More about CURLOPT here This will return std::string with given output, your json for example. Then you need to parse it.

In order to install libcurl for windows, you can follow this thread

For linux cmake you should add next to your cmake file

set(CURL_LIBRARY "-lcurl")
find_package(CURL REQUIRED)
include_directories(... ${CURL_INCLUDE_DIR})
target_link_libraries(... $(CURL_LIBRARIES))

edited Jun 19 '21 at 12:11

answered Jun 19 '21 at 11:26

Dusan Todorovic

472
2
12

oh im very gratfull tu u!! but could you show how to correctly add headers and the type of the request itself to the requests, since I frankly cannot understand how to do this correctly, because libcurl looks very difficult for me – Leopold95 Jun 19 '21 at 11:37
@Leopold95 Can you please tell me on which operating system do you wish to do so? Ill write it down – Dusan Todorovic Jun 19 '21 at 11:43
now im under windows. But there is qt project in vs2019. maby in future ill to build this prog under linux – Leopold95 Jun 19 '21 at 11:45
I editet answer with c++ cmake linux – Dusan Todorovic Jun 19 '21 at 11:45
For windows this thread https://stackoverflow.com/a/54680718/9349507 – Dusan Todorovic Jun 19 '21 at 11:49
ok.thx. but can u pls edit answer with adding my headers and request type (get, post etc)? i have no clue hoe to do this – Leopold95 Jun 19 '21 at 11:50
@Leopold95 please wait a moment ill add it, but let me first test it – Dusan Todorovic Jun 19 '21 at 11:56
Oh. Ill be very grateful for u. But my my url wont wont work in any way. Because it need another host and bearer key – Leopold95 Jun 19 '21 at 12:05
@Leopold95 yes, i see. Im just testing code. – Dusan Todorovic Jun 19 '21 at 12:05
@Leopold95 I added everything you need for starters, but you should read the curl documentation a bit to see what does what as you will need to modify this for your case – Dusan Todorovic Jun 19 '21 at 12:14
OMG im very grateful for u!!! Thanks so much! Sry, but i cant taste this now. Ill answer u to the next day or maybe in the evening but i will – Leopold95 Jun 19 '21 at 12:17
1

so im vary gatefull u. everything works fine. – Leopold95 Jun 20 '21 at 07:35

How to use libcurl with this request and get json server answer c++?

1 Answers1