uploadToImgur.cpp

/*
Compile static Libcurl :
cmd.exe /C "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvars32.bat"
git clone https://github.com/curl/curl.git
cd curl\winbuild
Set RTLIBCFG=static
nmake /f Makefile.vc mode=static DEBUG=yes VC=15

Configure VS2017
preprocessor macro : CURL_STATICLIB
code generation : MDd
include and library pathes
and add the dependancies libcurl_a_debug.lib ws2_32.lib wldap32.lib crypt32.lib normaliz.lib
*/

#include <iostream>
#include <curl\curl.h>
int main()
{
    CURL *curl;
    CURLcode res;
    const char *imgPath = "C:\\Temp\\soz.jpg";
    curl = curl_easy_init();
    if (curl) {
        curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "POST");
        curl_easy_setopt(curl, CURLOPT_URL, "https://api.imgur.com/3/image");
        curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
        curl_easy_setopt(curl, CURLOPT_DEFAULT_PROTOCOL, "https");
        struct curl_slist *headers = NULL;
        headers = curl_slist_append(headers, "Authorization: Client-ID imgurClientID");
        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers);
        curl_mime *mime;
        curl_mimepart *part;
        mime = curl_mime_init(curl);
        part = curl_mime_addpart(mime);
        curl_mime_name(part, "image");
        curl_mime_filedata(part, imgPath);
        curl_mime_type(part, "image/jpeg");
        curl_easy_setopt(curl, CURLOPT_MIMEPOST, mime);
        res = curl_easy_perform(curl);
        std::string result = curl_easy_strerror(res);
        std::cout << result.c_str() << std::endl;
        curl_mime_free(mime);
    }
    curl_easy_cleanup(curl);
    system("pause");
}