ftpgetresp.c

专门介绍网络爬虫设计的论文,写得非常好啊.希望大家好好学习

/*****************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * $Id: ftpgetresp.c,v 1.3 2007-07-06 20:14:03 bagder Exp $
 */

#include <stdio.h>

#include <curl/curl.h>
#include <curl/types.h>
#include <curl/easy.h>

/*
 * Similar to ftpget.c but this also stores the received response-lines
 * in a separate file using our own callback!
 *
 * This functionality was introduced in libcurl 7.9.3.
 */

size_t
write_response(void *ptr, size_t size, size_t nmemb, void *data)
{
  FILE *writehere = (FILE *)data;
  return fwrite(ptr, size, nmemb, writehere);
}

int main(int argc, char **argv)
{
  CURL *curl;
  CURLcode res;
  FILE *ftpfile;
  FILE *respfile;

  /* local file name to store the file as */
  ftpfile = fopen("ftp-list", "wb"); /* b is binary, needed on win32 */

  /* local file name to store the FTP server's response lines in */
  respfile = fopen("ftp-responses", "wb"); /* b is binary, needed on win32 */

  curl = curl_easy_init();
  if(curl) {
    /* Get a file listing from sunet */
    curl_easy_setopt(curl, CURLOPT_URL, "ftp://ftp.sunet.se/");
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, ftpfile);
    /* If you intend to use this on windows with a libcurl DLL, you must use
       CURLOPT_WRITEFUNCTION as well */
    curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, write_response);
    curl_easy_setopt(curl, CURLOPT_WRITEHEADER, respfile);
    res = curl_easy_perform(curl);

    /* always cleanup */
    curl_easy_cleanup(curl);
  }

  fclose(ftpfile); /* close the local file */
  fclose(respfile); /* close the response file */

  return 0;
}