使用HttpWebRequest获取ReCaptcha？

时间：2013-10-30 11:12:49

标签： c# httpwebrequest

我已经在这个问题上工作了很长时间，似乎无法通过HttpWebRequest获取ReCaptcha

ReCaptcha示例：Rene-Server - TopList -Voting

生成验证码here

每当您访问此链接时，它将生成新的挑战，我尝试首先连接到该页面，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。 / p>

url下面会给出静态Captcha：

  

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

示例：

  

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">
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<head>
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<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>
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<meta name="generator" content="vBulletin 4.2.0"/>
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NcodeImageResizer.MAXWIDTH = '600';
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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.';
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  cursor: pointer;
  resize: none;
  overflow:hidden;
  -moz-border-radius: 6px 6px 0px 0px;
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</head>
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<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"/>
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<br/><br/>
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</noscript>
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google_ad_client = "ca-pub-5897627310846259";
/* TopList Vote */
google_ad_slot = "7338286446";
google_ad_width = 728;
google_ad_height = 90;
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这可能是因为Captcha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：

从页面中抓取所有图像并将其保存到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：

以某种方式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，否则将在下一次请求时更改验证码。

任何人都可以分享有关此信息或提供代码？请不要告诉我使用WebBrowser，因为那就是垃圾..

任何人都可以分享有关此信息或提供代码？

提前谢谢。

1 个答案:

答案 0 :(得分：0)

诀窍是遵循这个：将captca图像保存到磁盘当你使用HTTPWEBREQUEST命中它时它将是一个新图像但它无关紧要并自己解决它或api。在原始帖子上发送新的验证码使用验证码文本挑战号码并且它可以工作，我为LinkedIN做了类似的操作，它也使用相同的验证码。

谢谢

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