#include <stdio.h>

#include <string.h>

#include <curl/curl.h>

int main(int argc, char *argv[])

{

  CURL *curl;

  CURLcode res;

  struct curl_httppost *formpost=NULL;

  struct curl_httppost *lastptr=NULL;

  struct curl_slist *headerlist=NULL;

  static const char buf[] = "Expect:";

  curl_global_init(CURL_GLOBAL_ALL);

  /* Fill in the file upload field */

  curl_formadd(&formpost,

               &lastptr,

               CURLFORM_COPYNAME, "message",

               CURLFORM_COPYCONTENTS, "hello",

               CURLFORM_END);

  /* Fill in the filename field */

  curl_formadd(&formpost,

               &lastptr,

               CURLFORM_COPYNAME, "filename",

               CURLFORM_FILE,"test.xlsx",

               CURLFORM_CONTENTTYPE, "application/vnd.ms-excel",

               CURLFORM_END);

  curl = curl_easy_init();

  /* initalize custom header list (stating that Expect: 100-continue is not

     wanted */

  headerlist = curl_slist_append(headerlist, buf);

  if(curl) {

    /* what URL that receives this POST */

    curl_easy_setopt(curl, CURLOPT_URL, "http://192.168.1.107/protocol/upload_questions/");

    if ( (argc == ) && (!strcmp(argv[], "noexpectheader")) )

      /* only disable 100-continue header if explicitly requested */

      curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);

    curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);

    /* 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));

    /* always cleanup */

    curl_easy_cleanup(curl);

    /* then cleanup the formpost chain */

    curl_formfree(formpost);

    /* free slist */

    curl_slist_free_all (headerlist);

  }

  return ;

}