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

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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：

using System;
using System.ComponentModel;
using System.Net;
using System.Runtime.InteropServices;
using System.Security;
using System.Security.Permissions;
using System.Text; internal sealed class NativeMethods
{
#region enums public enum ErrorFlags
{
ERROR_INSUFFICIENT_BUFFER = ,
ERROR_INVALID_PARAMETER = ,
ERROR_NO_MORE_ITEMS =
} public enum InternetFlags
{
INTERNET_COOKIE_HTTPONLY = , //Requires IE 8 or higher
INTERNET_COOKIE_THIRD_PARTY = ,
INTERNET_FLAG_RESTRICTED_ZONE =
} #endregion #region DLL Imports [SuppressUnmanagedCodeSecurity, SecurityCritical, DllImport("wininet.dll", EntryPoint = "InternetGetCookieExW", CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)]
internal static extern bool InternetGetCookieEx([In] string Url, [In] string cookieName, [Out] StringBuilder cookieData, [In, Out] ref uint pchCookieData, uint flags, IntPtr reserved); #endregion
} /// <SUMMARY></SUMMARY>
/// 取得WebBrowser的完整Cookie。
/// 因为默认的webBrowser1.Document.Cookie取不到HttpOnly的Cookie
///
public class FullWebBrowserCookie
{ [SecurityCritical]
public static string GetCookieInternal(Uri uri, bool throwIfNoCookie)
{
uint pchCookieData = ;
string url = UriToString(uri);
uint flag = (uint)NativeMethods.InternetFlags.INTERNET_COOKIE_HTTPONLY; //Gets the size of the string builder
if (NativeMethods.InternetGetCookieEx(url, null, null, ref pchCookieData, flag, IntPtr.Zero))
{
pchCookieData++;
StringBuilder cookieData = new StringBuilder((int)pchCookieData); //Read the cookie
if (NativeMethods.InternetGetCookieEx(url, null, cookieData, ref pchCookieData, flag, IntPtr.Zero))
{
DemandWebPermission(uri);
return cookieData.ToString();
}
} int lastErrorCode = Marshal.GetLastWin32Error(); if (throwIfNoCookie || (lastErrorCode != (int)NativeMethods.ErrorFlags.ERROR_NO_MORE_ITEMS))
{
throw new Win32Exception(lastErrorCode);
} return null;
} private static void DemandWebPermission(Uri uri)
{
string uriString = UriToString(uri); if (uri.IsFile)
{
string localPath = uri.LocalPath;
new FileIOPermission(FileIOPermissionAccess.Read, localPath).Demand();
}
else
{
new WebPermission(NetworkAccess.Connect, uriString).Demand();
}
} private static string UriToString(Uri uri)
{
if (uri == null)
{
throw new ArgumentNullException("uri");
} UriComponents components = (uri.IsAbsoluteUri ? UriComponents.AbsoluteUri : UriComponents.SerializationInfoString);
return new StringBuilder(uri.GetComponents(components, UriFormat.SafeUnescaped), ).ToString();
}
}