【libcurl】
官方网站： http://curl.haxx.se/libcurl
更多特点： http://curl.haxx.se/docs/features.html
运行平台：Unix/Linux，Windows（Windows上貌似也有实现）
 
Libcurl为一个免费开源的，客户端url传输库，支持FTP，FTPS，TFTP，HTTP，HTTPS，GOPHER，TELNET，DICT，FILE和LDAP，跨平台，支持Windows，Unix，Linux等，线程安全，支持Ipv6。并且易于使用。
 
从http://curl.haxx.se/libcurl/ 下载一个稳定的版本，注意选择OS。
 
编译libcurl
下载下来的是源码包，需要编译。
解压zip文件，进入curl-7.14.0\lib目录（我下载的是7.14.0）。
编译Debug版本。新建一个批处理bat文件，如buildDebug.bat，内容如下：
call "C:\Program Files\Microsoft Visual Studio\VC98\Bin\vcvars32.bat"
set CFG=debug-dll-ssl-dll-zlib-dll
set OPENSSL_PATH=E:\SSL\openssl-0.9.7e
set ZLIB_PATH=E:\zip\zlib123
nmake -f Makefile.vc6
 
其输出：libcurld_imp.lib, libcurld.dll
 
编译Release版本。新建一个批处理文件BuildRelease.bat，内容如下：
call "C:\Program Files\Microsoft Visual Studio\VC98\Bin\vcvars32.bat"
set CFG=release-dll-ssl-dll-zlib-dll
set OPENSSL_PATH=E:\SSL\openssl-0.9.7e
set ZLIB_PATH=E:\zip\zlib123
nmake -f Makefile.vc6
 
其输出：libcurl_imp.lib, libcurl.dll
 
上面编译的是libcurl的 dll，使用OpenSSL Dll版本和Zlib Dll版本。如果没有，可以从 www.openssl.org 或者 http://www.zlib.net/ 下载。
如果需要编译其他版本，可查看Makefile.vc6，设定相应的CFG 参数即可。
 
商业软件使用libcurl时，只需要包含其copywrite声明即可。
 
Sample
 
#include <stdio.h>
#include "../curl-7.14.0/include/curl/curl.h"
#pragma comment(lib, "../curl-7.14.0/lib/libcurl_imp.lib")

int main(void)
{
   curl = curl_easy_init();
  if(curl) {

     CURLcode res;    
     res = curl_easy_setopt(curl, CURLOPT_PROXY, "Test-pxy08:8080");
     res = curl_easy_setopt(curl, CURLOPT_PROXYTYPE, CURLPROXY_HTTP);
     res = curl_easy_setopt(curl, CURLOPT_URL, "http://www.vckbase.com");
     res = curl_easy_perform(curl);

    if(CURLE_OK == res) {
      char *ct;
      /**//* ask for the content-type */
      /**//* http://curl.haxx.se/libcurl/c/curl_easy_getinfo.html */
       res = curl_easy_getinfo(curl, CURLINFO_CONTENT_TYPE, &ct);

      if((CURLE_OK == res) && ct)
         printf("We received Content-Type: %s ", ct);
     }

    /**//* always cleanup */
     curl_easy_cleanup(curl);
   }
  return 0;
}
 
 
【libfetch】
官方网站： http://libfetch.darwinports.com/ 
更多信息： http://www.freebsd.org/cgi/man.cgi?query=fetch&sektion=3
运行平台：BSD
前几天无双老大在FB版介绍了一下CU的巨猛的法老级灌水大师，小弟于是说要编个程序自动来灌，哈哈昨晚有所突破，找到一个很好的库，先介绍给各位大鱼小虾们，不过可别真的拿它来灌水啊，否则我被这里的班长们砍死以后的冤魂可要来算帐的喔！      
这是在FreeBSD里找到的一个库：libfetch，源代码在/usr/src/lib/libfetch里，它对http和ftp协议进行了封装，提供了一些很容易使用的函数，因为昨天刚看到，还没仔细研究，我试了一个用http取网页的函数，示例如下：
#include <stio.h>
#include 
#include 

#include "fetch.h"

const char * myurl = "http://qjlemon:aaa@192.169.0.1:8080/test.html";

main()
{
         FILE * fp;
        char buf[1024];

         fp = fetchGetURL(myurl, "";
        if (!fp) {
                 printf("error: %s ", fetchLastErrString);
                return 1;
         }
        while (!feof(fp)) {
                 memset(buf, 0, sizeof(buf));
                 fgets(buf, sizeof(buf), fp);
                if (ferror(fp))
                        break;
                if (buf[0])
                         printf("%s", buf);
                else
                        break;
         }
         fclose(fp);
         fp = NULL;
}

这里最重要的就是fetchGetURL函数，它按指定的URL来取文件，比如URL
是以http开头的，这个函数就知道按http取文件，如果是ftp://，就会按ftp取文件，还可以指定用户名和口令。
如果文件被取到，它会返回一个FILE指针，可以象操作普通的文件一样把网页的内容取出来。
另外这个库还提供了一些函数，可以对网络操作进行更为精细的控制。
当然最有用的是还是几个PUT函数，想要灌水就得用这个哟！哈哈哈！
 
【其他相关HTTP/FTP客户端库】
资料来源： http://curl.haxx.se/libcurl/competitors.html
Free Software and Open Source projects have a long tradition of forks and duplicate efforts. We enjoy "doing it ourselves", no matter if someone else has done something very similar already.
Free/open libraries that cover parts of libcurl's features:
libcurl (MIT)
  • a highly portable and easy-to-use client-side URL transfer library, supporting FTP, FTPS, HTTP, HTTPS, SCP, SFTP, TELNET, DICT, FILE, TFTP and LDAP. libcurl also supports HTTPS certificates, HTTP POST, HTTP PUT, FTP uploading, kerberos, HTTP form based upload, proxies, cookies, user+password authentication, file transfer resume, http proxy tunnelling and more!
libghttp (LGPL)
  • Having a glance at libghttp (a gnome http library), it looks as if it works rather similar to libcurl (for http). There's no web page for this and the person who's email is mentioned in the README of the latest release I found claims he has passed the leadership of the project to "eazel". Popular choice among GNOME projects.
  • More complex, and and harder to use than libcurl is. Includes everything from multi-threading to HTML parsing. The most notable transfer-related feature that libcurl does not offer but libwww does, is caching.
libferit (GPL)
    • C++ library "for transferring files via http, ftp, gopher, proxy server". Based on 'snarf' 2.0.9-code (formerly known as libsnarf). Quote from freshmeat:

 "As the author of snarf, I have to say this frightens me. Snarf's networking system is far from robust and complete. It's probably full of bugs, and although it works for maybe 85% of all current situations, I wouldn't base a library on it."

neon (LGPL)
  • An HTTP and WebDAV client library, with a C interface. I've mainly heard and seen people use this with WebDAV as their main interest.
  • Part of glib (GNOME). Supports: HTTP 1.1, Persistent connections, Asynchronous DNS and transfers, Connection cache, Redirects, Basic, Digest, NTLM authentication, SSL with OpenSSL or Mozilla NSS, Proxy support including SSL, SOCKS support, POST data. Probably not very portable. Lacks: cookie support, NTLM for proxies, GSS, gzip encoding, trailers in chunked responses and more.
  • Handles URLs, protocols, transports for the Mozilla browser.
  • Minimal download library targeted to be much smaller than the above mentioned netlib. HTTP and FTP support.
wget (GPL)
  • While not a library at all, I've been told that people sometimes extract the network code from it and base their own hacks from there.
libfetch (BSD)
    • Does HTTP and FTP transfers (both ways), supports file: URLs, and an API for URL parsing. The utility

 fetch 

    • that is built on libfetch is an integral part of the

 FreeBSD 

  • operating system.
HTTP Fetcher (LGPL)
    • "

a small, robust, flexible library for downloading files via HTTP using the GET method.

  • "
http-tiny (Artistic License)
    • "

a very small C library to make http queries (GET, HEAD, PUT, DELETE, etc.) easily portable and embeddable

  • "
XMLHTTP Object also known as IXMLHTTPRequest (part of MSXML 3.0)
  • (Windows) Provides client-side protocol support for communication with HTTP servers. A client computer can use the XMLHTTP object to send an arbitrary HTTP request, receive the response, and have the Microsoft® XML Document Object Model (DOM) parse that response.
QHttp (GPL)
  • QHttp is a class in the Qt library from Troll Tech. Seems to be restricted to plain HTTP. Supports GET, POST and proxy. Asynchronous.
ftplib (GPL)
    • "

a set of routines that implement the FTP protocol. They allow applications to create and access remote files through function calls instead of needing to fork and exec an interactive ftp client program."

ftplibpp (GPL)
  • A C++ library for "easy FTP client functionality. It features resuming of up- and downloads, FXP support, SSL/TLS encryption, and logging functionality."
  • Has a URLStream class. This C++ class allow you to download a file using HTTP. See demo/urlfetch.cpp in commoncpp2-1.3.19.tar.gz
HTTPClient (LGPL)
  • Java HTTP client library.
Jakarta Commons HttpClient (Apache License)
  • A Java HTTP client library written by the Jakarta project.
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