TradeSim/main.cpp

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

size_t writefunc(void *ptr, size_t size, size_t nmemb, std::string *s)
{
    s->append(static_cast<char *>(ptr), size*nmemb);
    return size*nmemb;
}

int main(void)
{
    CURL *curl;
    CURLcode res;

    curl = curl_easy_init();
    if(curl) {
        std::string s;
        curl_easy_setopt(curl, CURLOPT_URL, "https://api3.binance.com/api/v3/trades?symbol=ETHEUR&limit=10");


        curl_easy_setopt(curl, CURLOPT_HTTPGET, 1);

        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
        curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);

        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writefunc);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &s);
        /* Perform the request, res will get the return code */

        res = curl_easy_perform(curl);

        /* Check for errors */
        if(res != CURLE_OK)
            fprintf(stderr, "curl_easy_perform() failed: %s\n",
                    curl_easy_strerror(res));
        Json::Value root;
        JSONCPP_STRING err;
        Json::CharReaderBuilder builder;
        const std::unique_ptr<Json::CharReader> reader(builder.newCharReader());
        if (!reader->parse(s.c_str(), s.c_str() + s.length(), &root,
                           &err)) {
            std::cout << "error" << std::endl;
            return EXIT_FAILURE;
        }
        std::cout << root[0]["price"].asString() << std::endl;
        /* always cleanup */
        curl_easy_cleanup(curl);
    }
    return 0;
}