Upload File + Callback

upload.cpp

#include <stdio.h>
#include <iostream>
#include <string>
#include <curl/curl.h>
using namespace std;

static string data;

size_t writeCallback(char *buf, size_t size, size_t nmemb, void *up)
{
    //callback must have this declaration
    //buf is a pointer to the data that curl has for us
    //size*nmemb is the size of the buffer

    for (int c = 0; c < size * nmemb; c++)
    {
        // This is data that is coming 
        cout << buf[c];
        data.push_back(buf[c]);
    }
    // this is the data that will come 
    cout << "data \n" << data << endl;
    return size * nmemb; //tell curl how many bytes we handled
}

int main(int argc, char *argv[])
{
    data = "";
    struct curl_httppost *post = NULL;
    struct curl_httppost *last = NULL;
    CURLcode res;
    CURL *curl;

    curl = curl_easy_init();

    if (curl)
    {
        curl_formadd(&post, &last,
                     CURLFORM_COPYNAME, "image",
                     CURLFORM_FILE, "/Users/msk/Desktop/36986233436.jpg",
                     CURLFORM_END);
        curl_formadd(&post, &last,
                     CURLFORM_COPYNAME, "image",
                     CURLFORM_COPYCONTENTS, "/Users/msk/Desktop/36986233436.jpg",
                     CURLFORM_END);
        /////////////////////////////////////////////////////////////////////

        curl_formadd(&post, &last,
                     CURLFORM_COPYNAME, "key",
                     CURLFORM_COPYCONTENTS, "1748ee815be8f13cea057a29a7ec47ee",
                     CURLFORM_END);

        curl_easy_setopt(curl, CURLOPT_URL, "http://api.imgur.com/2/upload.xml");
        curl_easy_setopt(curl, CURLOPT_HTTPPOST, post);
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &writeCallback);
        //curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); //tell curl to output its progress
        res = curl_easy_perform(curl);
        if (res)
        {
            return 0;
        }

        curl_formfree(post);
    }
    else
    {
        return 0;
    }

    curl_easy_cleanup(curl);

   // fprintf(stderr, "%s\n", &data);
    //cout << data << endl;
    return 0;
}