webBrowser1.Document.Cookie取不到HttpOnly的Cookie，取Cookie不完整

在做数据采集时，有些网站需要输入验证码，但各网站验证码都不同，不可能有完美的识别验证码的代码，所以我也没去研究，我所采取的方案是：在winform里通过WebBrowser调用网页先手动登录系统，然后再通过webBrowser1.Document.Cookie获取其Cookie，再将其用到HttpWebRequest里用来访问自己需要的页。

一直用的都没有问题，但最近在对一个网站操作时总是不能获取完整Cookie，百思不得其解，使用Fiddler2对比发现，不能获取到的Cookie里最后有一个HttpOnly的标识，顺藤摸瓜发现原来webBrowser1.Document.Cookie里是取不到HttpOnly的Cookie的，也找到解决方法：

  1 using System;   

  2 using System.ComponentModel;   

  3 using System.Net;   

  4 using System.Runtime.InteropServices;   

  5 using System.Security;   

  6 using System.Security.Permissions;   

  7 using System.Text;   

  8   

  9   

 10 internal sealed class NativeMethods   

 11 {  

 12     #region enums   

 13   

 14     public enum ErrorFlags   

 15     {   

 16         ERROR_INSUFFICIENT_BUFFER = 122,   

 17         ERROR_INVALID_PARAMETER = 87,   

 18         ERROR_NO_MORE_ITEMS = 259   

 19     }   

 20   

 21     public enum InternetFlags   

 22     {   

 23         INTERNET_COOKIE_HTTPONLY = 8192, //Requires IE 8 or higher   

 24         INTERNET_COOKIE_THIRD_PARTY = 131072,   

 25         INTERNET_FLAG_RESTRICTED_ZONE = 16   

 26     }  

 27  

 28     #endregion  

 29  

 30     #region DLL Imports   

 31   

 32     [SuppressUnmanagedCodeSecurity, SecurityCritical, DllImport("wininet.dll", EntryPoint = "InternetGetCookieExW", CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)]   

 33     internal static extern bool InternetGetCookieEx([In] string Url, [In] string cookieName, [Out] StringBuilder cookieData, [In, Out] ref uint pchCookieData, uint flags, IntPtr reserved);  

 34  

 35     #endregion   

 36 }   

 37   

 38   

 39 /// <SUMMARY></SUMMARY>   

 40 /// 取得WebBrowser的完整Cookie。   

 41 /// 因为默认的webBrowser1.Document.Cookie取不到HttpOnly的Cookie   

 42 ///    

 43 public class FullWebBrowserCookie   

 44 {   

 45   

 46     [SecurityCritical]   

 47     public static string GetCookieInternal(Uri uri, bool throwIfNoCookie)   

 48     {   

 49         uint pchCookieData = 0;   

 50         string url = UriToString(uri);   

 51         uint flag = (uint)NativeMethods.InternetFlags.INTERNET_COOKIE_HTTPONLY;   

 52   

 53         //Gets the size of the string builder   

 54         if (NativeMethods.InternetGetCookieEx(url, null, null, ref pchCookieData, flag, IntPtr.Zero))   

 55         {   

 56             pchCookieData++;   

 57             StringBuilder cookieData = new StringBuilder((int)pchCookieData);   

 58   

 59             //Read the cookie   

 60             if (NativeMethods.InternetGetCookieEx(url, null, cookieData, ref pchCookieData, flag, IntPtr.Zero))   

 61             {   

 62                 DemandWebPermission(uri);   

 63                 return cookieData.ToString();   

 64             }   

 65         }   

 66   

 67         int lastErrorCode = Marshal.GetLastWin32Error();   

 68   

 69         if (throwIfNoCookie || (lastErrorCode != (int)NativeMethods.ErrorFlags.ERROR_NO_MORE_ITEMS))   

 70         {   

 71             throw new Win32Exception(lastErrorCode);   

 72         }   

 73   

 74         return null;   

 75     }   

 76   

 77     private static void DemandWebPermission(Uri uri)   

 78     {   

 79         string uriString = UriToString(uri);   

 80   

 81         if (uri.IsFile)   

 82         {   

 83             string localPath = uri.LocalPath;   

 84             new FileIOPermission(FileIOPermissionAccess.Read, localPath).Demand();   

 85         }   

 86         else  

 87         {   

 88             new WebPermission(NetworkAccess.Connect, uriString).Demand();   

 89         }   

 90     }   

 91   

 92     private static string UriToString(Uri uri)   

 93     {   

 94         if (uri == null)   

 95         {   

 96             throw new ArgumentNullException("uri");   

 97         }   

 98   

 99         UriComponents components = (uri.IsAbsoluteUri ? UriComponents.AbsoluteUri : UriComponents.SerializationInfoString);   

100         return new StringBuilder(uri.GetComponents(components, UriFormat.SafeUnescaped), 2083).ToString();   

101     }   

102 }   

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