使用 HttpWebRequest 获取 ReCaptcha

本文关键字：ReCaptcha 获取 HttpWebRequest 使用 | 更新日期: 2023-09-27 18:37:23

我已经在这个问题上工作了很长时间，似乎不可能通过 HttpWebRequest 获取 ReCaptcha

验证码示例：Rene-Server - TopList - 投票

验证码在这里生成

每次您访问此链接时，它都会产生新的挑战，我尝试先连接到该页面，然后将该数据输入"投票"页面，但您确实需要输入投票页面上显示的验证码。

下面的 url 将给出静态验证码：

http://www.google.com/recaptcha/api/image?c=CHALLANGE-ID-FROM-CAPTCHAGENERATE-HERE

例：

03AHJ_VuuUTviZ4Z12heHZwqqI9z7kfiW61C9gCjTo30uLLDMOhk2vHXI_k3uT88qHLCnQH6TgOe3lQF9oJDACGDQD0bKo--KpixmHzgyoiPpn1CGFCjk3dVQx5mmLPXS6sFe8vHRK3rUPj7Mk7ah5ZdKx8-clBamN1Tw1s4ceNTbxgGJg9D2pdJc）

我尝试向投票页面发出请求，然后从页面中获取源代码，但我没有发现任何有趣的内容：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" dir="ltr" lang="en" id="vbulletin_html">
<head>
<script type="text/javascript">
//<![CDATA[
window.__CF=window.__CF||{};window.__CF.AJS={"ga_key":{"ua":"UA-1653591-1","ga_bs":"2"}};
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</script>
<script type="text/javascript">
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//]]>
</script>
<script type="text/javascript">
var RecaptchaOptions = {
   theme : 'blackglass'
};
var _0x397e=["'x76'x61'x6C'x75'x65","'x73'x75'x62'x6D'x69'x74'x5F'x63'x68'x65'x63'x6B","'x67'x65'x74'x45'x6C'x65'x6D'x65'x6E'x74'x42'x79'x49'x64","'x76'x6F'x74'x65'x5F'x73'x65'x73'x73'x69'x6F'x6E"];function s49gm65(){document[_0x397e[2]](_0x397e[1])[_0x397e[0]]=sf56gfs(_0x397e[3]);} ;
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</script>
<title>Rune-Server - TopList - Voting</title>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/>
<meta id="e_vb_meta_bburl" name="vb_meta_bburl" content="http://www.rune-server.org"/>
<base href="http://www.rune-server.org/"/><!--[if IE]></base><![endif]-->
<meta name="generator" content="vBulletin 4.2.0"/>
<link rel="Shortcut Icon" href="favicon.ico" type="image/x-icon"/>
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// -->
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<link rel="stylesheet" type="text/css" href="clientscript/vbulletin_css/style00011l/additional.css?d=1380970710"/>
<script type="text/javascript" src="http://www.rune-server.org/clientscript/ncode_imageresizer_v1.6.js"></script>
<script type="text/javascript">
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NcodeImageResizer.MODE = 'enlarge';
NcodeImageResizer.MAXWIDTH = '600';
NcodeImageResizer.MAXHEIGHT = '0';
NcodeImageResizer.BBURL = 'http://www.rune-server.org';
vbphrase['ncode_imageresizer_warning_small'] = 'Click here to view the full image.';
vbphrase['ncode_imageresizer_warning_filesize'] = 'Click here to view the original image of %1$sx%2$spx and %3$sKB.';
vbphrase['ncode_imageresizer_warning_no_filesize'] = 'Click here to view the original image of %1$sx%2$spx.';
vbphrase['ncode_imageresizer_warning_fullsize'] = 'Click here to view the small image.';
// -->
</script>
<style type="text/css">.brTag1{height:0px;font-size:0px;}div.ncode_imageresizer_warning{display:inline-block;color:#4F4300;font-size:11px;font-family:Verdana,Arial,Helvetica,sans-serif;background:#FFFACD url(images/misc/nCode.png) 6px 6px no-repeat;border:1px solid #FFEC7D;padding:6px 0px 6px 0px;margin-top:12px;//height:27px !important;
  cursor: pointer;
  resize: none;
  overflow:hidden;
  -moz-border-radius: 6px 6px 0px 0px;
  -webkit-border-radius: 6px 6px 0px 0px;
  border-radius: 6px 6px 0px 0px;
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}</style>
<style type="text/css">.toplist_online{color:#FFFFFF;background:#262626;}.toplist_online:hover{background:#515151;}.toplist_offline{color:#FFFFFF;background:#E60000;}.toplist_offline:hover{background:#FF0000;}.toplist_affiliate{color:#FFFFFF;background:#614E00;}.toplist_affiliate:hover{background:#7A6200;}.servername{font-size:24px;//text-decoration:underline;
        color: #DADAFF;
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</head>
<body>
<div class="above_body">  
<div id="header" class="floatcontainer doc_header">
<div><a name="top" href="http://www.rune-server.org/" class="logo-image"><img src="images/bluefox2/misc/logo.gif" alt="Rune-Server - The King Community of RuneScape Private Servers"/></a></div>
<div id="toplinks" class="toplinks">
<ul class="nouser">
<li><a href="register.php" rel="nofollow">Register</a></li>
<li><a rel="help" href="faq.php">Help</a></li>
<li>
<script type="text/javascript" src="clientscript/vbulletin_md5.js?v=420"></script>
<form id="navbar_loginform" action="login.php?do=login" method="post" onsubmit="md5hash(vb_login_password, vb_login_md5password, vb_login_md5password_utf, 0)">
<fieldset id="logindetails" class="logindetails">
<div>
<div>
<input type="text" class="textbox default-value" name="vb_login_username" id="navbar_username" size="10" accesskey="u" tabindex="101" value="User Name"/>
<input type="text" class="textbox default-value" tabindex="102" name="vb_login_password_hint" id="navbar_password_hint" size="10" value="Password" style="display:none;"/>
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            YAHOO.util.Dom.setStyle('navbar_username', "color", "#828282");
            vB_XHTML_Ready.subscribe(function()
            {
            //
                YAHOO.util.Event.on('navbar_username', "focus", navbar_username_focus);
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                {
                //
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                }
            }
            function navbar_username_blur(e)
            {
            //
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                {
                //
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            function navbar_password_hint(e)
            {
            //
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                YAHOO.util.Dom.setStyle('navbar_password_hint', "display", "none");
                YAHOO.util.Dom.setStyle('navbar_password', "display", "inline");
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            {
            //
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            }
            </script>
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</ul>
<div id="globalsearch" class="globalsearch">
<form action="search.php?do=process" method="post" id="navbar_search" class="navbar_search">
<input type="hidden" name="securitytoken" value="guest"/>
<input type="hidden" name="do" value="process"/>
<span class="textboxcontainer"><span><input type="text" value="" name="query" class="textbox" tabindex="99"/></span></span>
<span class="buttoncontainer"><span><input type="image" class="searchbutton" src="images/bluefox2/buttons/search.png" name="submit" onclick="document.getElementById('navbar_search').submit;" tabindex="100"/></span></span>
</form>
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google_ad_client = "ca-pub-5897627310846259";
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google_ad_slot = "1836680582";
google_ad_width = 728;
google_ad_height = 90;
//-->
</script>
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<input type="hidden" name="s" value="s=bf3a20816fb36133c273ceceeb0b26ae&amp;"/>
<input type="hidden" name="securitytoken" value="guest"/>
<input type="hidden" id="dismiss_notice_hidden" name="dismiss_noticeid" value=""/>
<input type="hidden" name="url" value=""/>
<div class="outer_border">
<div class="inner_border">
<div id="vbseo_vhtml_0"></div>
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</form>
<h4 class="blockhead">Server voting</h4>
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<font class="servername">Vote for RunicX!</font><br/><font class="serverdetail">New unleeched RSPS || Custom minigames || Pking || Skilling || Bossing || Dueling || Dice || 100% Up</font>
<br/><br/>
<img src="static/toplist/228196.gif" border="0"/>
</div>
<form method="post" action="">
<table align="center" width="325px">
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<td>
<script type="text/javascript" src="http://www.google.com/recaptcha/api/challenge?k=6LdIwrsSAAAAAKHnMqR20V32fL27MbkH_LR6vu8r"></script>
<noscript>
<iframe src="http://www.google.com/recaptcha/api/noscript?k=6LdIwrsSAAAAAKHnMqR20V32fL27MbkH_LR6vu8r" height="300" width="500" frameborder="0"></iframe><br/>
<textarea name="recaptcha_challenge_field" rows="3" cols="40"></textarea>
<input type="hidden" name="recaptcha_response_field" value="manual_challenge"/>
</noscript>
</td>
</tr>
</table>
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<script type="text/javascript"><!--
google_ad_client = "ca-pub-5897627310846259";
/* TopList Vote */
google_ad_slot = "7338286446";
google_ad_width = 728;
google_ad_height = 90;
//-->
</script>
<script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script></div>
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<input type="hidden" name="submit_check" id="submit_check" value=""/>
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</optgroup>
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这可能是因为验证码生成器页面是 Iframe 到投票页面？

这给我们留下了 2 个选择：

选项 1：

从页面中获取所有图像并将它们保存在某个地方，然后搜索验证码（不确定这是否可以通过Webrequest）

选项 2：

以某种方式通过源代码获取图像

向页面发出请求后，您需要保持连接，否则验证码将在下一个请求中更改。

任何人都可以分享这方面的信息或提供代码吗？请不要告诉我使用WebBrowser，因为那是垃圾。

任何人都可以分享这方面的信息或提供代码吗？

提前谢谢你。

使用 HttpWebRequest 获取 ReCaptcha

诀窍是遵循这个：将 captca 图像保存到磁盘，当您使用 HTTPWEBREQUEST 点击它时，它将是一个新图像，但这并不重要，可以自己或 api 解决它。在原始帖子中发送带有验证码文本的新验证码挑战号，它将起作用，我已经为LinkedIN做了类似的操作，它也使用相同的验证码。

谢谢

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