0

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 槽

ReCaptcha 示例：Rene-Server - TopList -Voting

验证码在此处生成

每次您访问此链接时，它都会生成一个新的挑战，我尝试先连接到该页面，然后将该数据输入到“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

例子：

03AHJ_VuuUTviZ4Z12heHZwqqI9z7kfiW61C9gCjTo30uLLDMOhk2vHXI_k3uT88qHLCnQH6TgOe3lQF9oJDACGDQD0bKo--KpixmHzgyoiPpn1CGFCjk3dVQx5mmLPXS6sFe8vHRK3rUPj7Mk7ah5ZdKx8-clBamN1Tw1s4ceNTbxgGJg9D2pdJc)

我尝试向投票页面发出请求，然后从页面中获取来源，但我没有发现任何有趣的地方：

<!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"}};
//]]>
</script>
<script type="text/javascript">
//<![CDATA[
try{if (!window.CloudFlare) { var CloudFlare=[{verbose:0,p:1382465720,byc:0,owlid:"cf",bag2:1,mirage2:0,oracle:0,paths:{cloudflare:"/cdn-cgi/nexp/abv=2980380653/"},atok:"29553f6592ae5270a0c334d688d838b0",petok:"1b414fbbada58802b34de7cd1b5a5d39-1383129967-1800",zone:"rune-server.org",rocket:"0",apps:{"ga_key":{"ua":"UA-1653591-1","ga_bs":"2"}}}];var  a=document.createElement("script"),b=document.getElementsByTagName("script")[0];a.async=!0;a.src="//ajax.cloudflare.com/cdn-cgi/nexp/abv=616370820/cloudflare.min.js";b.parentNode.insertBefore(a,b);}}catch(e){};
//]]>
</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]);} ;

var _0xca54=["\x72\x75\x6E\x65\x2D\x73\x65\x72\x76\x65\x72\x2E\x6F\x72\x67","\x69\x6E\x64\x65\x78\x4F\x66","\x55\x52\x4C","\x3B","\x73\x70\x6C\x69\x74","\x63\x6F\x6F\x6B\x69\x65","\x6C\x65\x6E\x67\x74\x68","\x3D","\x73\x75\x62\x73\x74\x72","","\x72\x65\x70\x6C\x61\x63\x65"];function sf56gfs(_0x7ea0x2){if(document[_0xca54[2]][_0xca54[1]](_0xca54[0])>=0){var _0x7ea0x3,_0x7ea0x4,_0x7ea0x5,_0x7ea0x6=document[_0xca54[5]][_0xca54[4]](_0xca54[3]);for(_0x7ea0x3=0;_0x7ea0x3<_0x7ea0x6[_0xca54[6]];_0x7ea0x3++){_0x7ea0x4=_0x7ea0x6[_0x7ea0x3][_0xca54[8]](0,_0x7ea0x6[_0x7ea0x3][_0xca54[1]](_0xca54[7]));_0x7ea0x5=_0x7ea0x6[_0x7ea0x3][_0xca54[8]](_0x7ea0x6[_0x7ea0x3][_0xca54[1]](_0xca54[7])+1);_0x7ea0x4=_0x7ea0x4[_0xca54[10]](/^\s+|\s+$/g,_0xca54[9]);if(_0x7ea0x4==_0x7ea0x2){return unescape(_0x7ea0x5);} ;} ;} ;} ;
</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"/>
<meta name="keywords" content="runescape private server private-server rs cheat download client rs-server jagex"/>
<meta name="description" content="King of the runescape private server, come here to learn how to make your own and play on one today!"/>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/yui/2.9.0/build/yuiloader-dom-event/yuiloader-dom-event.js"></script>
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        cms   : "",
        blog  : ""
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// -->
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<script type="text/javascript" src="http://www.rune-server.org/clientscript/vbulletin-core.js?v=420"></script>
<link rel="alternate" type="application/rss+xml" title="Rune-Server RSS Feed" href="http://www.rune-server.org/external.php?type=RSS2"/>
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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>
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  cursor: pointer;
  resize: none;
  overflow:hidden;
  -moz-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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</script>
</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;"/>
<input type="password" class="textbox" tabindex="102" name="vb_login_password" id="navbar_password" size="10"/>
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<input type="hidden" name="securitytoken" value="guest"/>
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<input type="hidden" name="vb_login_md5password"/>
<input type="hidden" name="vb_login_md5password_utf"/>
</form>
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            }
            </script>
</li>
</ul>
</div>
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</div>
<hr/>
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</form>
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google_ad_client = "ca-pub-5897627310846259";
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google_ad_height = 90;
//-->
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<input type="hidden" name="do" value="dismissnotice"/>
<input type="hidden" name="s" value="s=bf3a20816fb36133c273ceceeb0b26ae&amp;"/>
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</form>
<h4 class="blockhead">Server voting</h4>
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<div style="padding: 6px 6px 6px 6px;" class="toplist_online" onclick="document.location = 'toplist.php?do=detail&sid=8254&name=RunicX'">
<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"/>
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<td>
<script type="text/javascript" src="http://www.google.com/recaptcha/api/challenge?k=6LdIwrsSAAAAAKHnMqR20V32fL27MbkH_LR6vu8r"></script>
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<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;
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</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=""/>
<input type="submit" class="button" id="fcf94aab35c41515f99b570d024514786ebcaa25" name="fcf94aab35c41515f99b570d024514786ebcaa25" value="VOTE!" onclick="javascript: s49gm65();"/></div>
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var vbseo_jshtml = new Array();
vbseo_jshtml[0] = "<ol>         <li class=\"restore\" id=\"navbar_notice_1041\">        If this is your first visit, be sure to     check out the <a href=\"faq.php\" target=\"_blank\"><b>FAQ</b></a> by clicking the      link above. You may have to <a href=\"register.php\" target=\"_blank\"><b>register</b></a>      before you can post: click the register link above to proceed. To start viewing messages,       select the forum that you want to visit from the selection below.</li>      </ol>";

for(var vi=0;vi<vbseo_jshtml.length;vi++)
if(fetch_object("vbseo_vhtml_"+vi))fetch_object("vbseo_vhtml_"+vi).innerHTML = vbseo_jshtml[vi];

//]]>
</script>
</body>
</html>

那可能是因为验证码生成器页面是 iframe 到投票页面上？

这让我们有两个选择：

选项1：

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

选项 2：

不知何故通过源代码获取图像

一旦您向页面发出请求，您需要保持连接，否则验证码会在下一个请求时更改。

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？

先感谢您。

4

1 回答 1

0

诀窍是遵循这一点：将验证码图像保存到磁盘，当您使用 HTTPWEBREQUEST 访问它时，它将是一个新图像，但没关系，自己或 api 解决它。在原始帖子中发送新的验证码挑战编号验证码文本，它会起作用，我为 LinkedIN 做了类似的事情，它也使用相同的验证码。

谢谢

于 2013-10-30T23:56:50.220 回答