Libcurl how to not show all this information - c

Question

How to not show all this info?
All I do is using little edited FTP example and i dont want that info to be shown.
edit: added full code from main.c
image in link: http://www.mediafire.com/convkey/71e9/oyhctzcdjxakzxzfg.jpg
#include <stdio.h>
#include <stdlib.h>
#include <curl/curl.h>
struct FtpFile {
const char *filename;
FILE *stream;
};
static size_t my_fwrite(void *buffer, size_t size, size_t nmemb, void *stream)
{
struct FtpFile *out=(struct FtpFile *)stream;
if(out && !out->stream) {
/* open file for writing */
out->stream=fopen(out->filename, "wb");
if(!out->stream)
return -1; /* failure, can't open file to write */
}
return fwrite(buffer, size, nmemb, out->stream);
}
int main()
{
CURL *curl;
CURLcode res;
struct FtpFile version={"version.txt", /* name to store the file as if succesful */NULL};
curl_global_init(CURL_GLOBAL_DEFAULT);
curl = curl_easy_init();
FILE *file_verzija;
int trenutna_verzija;
int nova_verzija;
char pitanje_za_update;
file_verzija=fopen("version.txt","r");
fscanf(file_verzija,"%i",&trenutna_verzija);
fclose(file_verzija);
printf("Current version %i",trenutna_verzija);
printf("\nChecking for updates...\n");
if(curl)
{
/*You better replace the URL with one that works!*/curl_easy_setopt(curl, CURLOPT_URL,"http://elektro-srb.com/site/muffin_finder_files/version.txt");
/* Define our callback to get called when there's data to be written */
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, my_fwrite);
/* Set a pointer to our struct to pass to the callback */
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &version);
/* Switch on full protocol/debug output */
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
res = curl_easy_perform(curl);
/* always cleanup */
curl_easy_cleanup(curl);
if(CURLE_OK != res)
{
/* we failed */
printf("\nerror");
}
}
if(version.stream)
fclose(version.stream); /* close the local file */
file_verzija=fopen("version.txt","r");
fscanf(file_verzija,"%i",&nova_verzija);
fclose(file_verzija);
if(trenutna_verzija != nova_verzija)
{
printf("\nUpdate found! New version is %i",nova_verzija);
}
else
{
printf("You are running latest version of Muffin Finder!");
}
if(trenutna_verzija != nova_verzija)
{
printf("\nUpdate? y/n");
scanf("\n%c",&pitanje_za_update);
if((pitanje_za_update == 'y') || (pitanje_za_update == 'Y'))
{
//UPDATE
}
else if((pitanje_za_update == 'n') || (pitanje_za_update == 'N'))
{
//pokretanje stare
}
}
curl_global_cleanup();
return 0;
}

Answer 1

You should construct a WRITEFUNCTION option, to prevent it from using stdout for printing.
See here: http://curl.haxx.se/libcurl/c/curl_easy_setopt.html.
Search for "WRITEFUNCTION". You should implement the function (and I assume you would like to leave it empty).
EDIT: As the manual states, you should do the following:
Implement a function to replace the default stdout:
size_t outputFunction(char *ptr, size_t size, size_t nmemb, void *userdata) {}
When you initialize the CURL structure, use this option:
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, outputFunction);

Answer 2

comment following line:
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);