首先我们创建一个php页面：
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"><form action="#" method="post"><input name="pass" type="text"></input><input name="submit" type="submit" value="Login"></input></form><?phpecho "Refer : " . $_SERVER['HTTP_REFERER'] . "<br>";if(isset($_POST['pass'])){ echo "Login successfully via PassWord <br> pass = " . $_POST['pass'] . "<br>"; setcookie("pass", "password");}else if(isset($_COOKIE['pass'])){ echo "Login successfully via COOKIE <br> pass = " . $_COOKIE['pass'] . "<br>";}else{ echo "Please login <br>";}?>这是一个简单的登录页面，可以通过输入密码登陆，也可以通过cookie登陆。
我们将通过这个页面示范C语言通过libcurl库进行设置http请求头、post、cookie的操作。
C代码：
#include "stdafx.h"#include "curl/curl.h"size_t function( void *ptr, size_t size, size_t nmemb, void *stream){ PRintf("%s/n", (char*)ptr); return 0;}int _tmain(int argc, TCHAR *argv[]){ CURL *curl; int i = 100; struct curl_slist *cookies = NULL; struct curl_slist *cookie = NULL; struct curl_slist *headers = NULL; curl = curl_easy_init(); //初始化 //http请求头 headers = curl_slist_append(headers,"POST /VSCurlTest.php HTTP/1.1"); headers = curl_slist_append(headers,"Host:127.0.0.1"); headers = curl_slist_append(headers,"Connection: keep-alive"); headers = curl_slist_append(headers,"User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.104 Safari/537.36 Core/1.53.2141.400 QQBrowser/9.5.10219.400"); headers = curl_slist_append(headers,"Cache-Control: max-age=0"); headers = curl_slist_append(headers,"Content-Type: application/x-www-form-urlencoded"); headers = curl_slist_append(headers,"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8"); headers = curl_slist_append(headers,"Referer:http://www.baidu.com"); headers = curl_slist_append(headers,"Accept-Encoding: gzip, deflate"); headers = curl_slist_append(headers,"Accept-Language: zh-CN,zh;q=0.8");// headers = curl_slist_append(headers,"Cookie: olfsk=olfsk7257964002188215; hblid=nR2Zo2hcfSVtItpT3m39N804DHbNAfAp; pass=password");//也可以直接通过头部提交cookie curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers); curl_easy_setopt(curl, CURLOPT_COOKIEFILE,"");//CURLOPT_COOKIEFILE参数用于从文件读取cookie。这里用于初始化cookie引擎,这样后面的curl_easy_getinfo才能正确接收到cookie数据. curl_easy_setopt(curl, CURLOPT_COOKIEJAR, "cookie_open.txt");//保存从服务器返回的cookie到文件，也就是说我们自己设置的并不会保存 curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L); curl_easy_setopt(curl, CURLOPT_URL, "http://127.0.0.1/VSCurlTest.php"); curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, function); curl_easy_setopt(curl, CURLOPT_POST, 1);//设置CURLOPT_POST之后必须带有POST数据 curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "pass=23333&submit=%CC%E1%BD%BB"); curl_easy_setopt(curl, CURLOPT_COOKIE, "olfsk=olfsk7257964002188215; hblid=nR2Zo2hcfSVtItpT3m39N804DHbNAfAp; pass=adadad"); curl_easy_perform(curl); curl_easy_getinfo(curl, CURLINFO_COOKIELIST, &cookies);//获取cookie，只获取服务器返回的cookie cookie = cookies; while(cookie) { printf("%s/n", cookie->data); cookie = cookie->next; } curl_slist_free_all(headers); curl_slist_free_all(cookies); curl_easy_cleanup(curl); getchar(); return 0;}通过注释这个例子的某些curl_easy_setopt调用，观察输出信息，大概也能理解libcurl的使用了。
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