C#用WebBrowser与WIN API辅助模拟获取网站完整Cookie

在Winform中使用WebBrowser控件获取网站的Cookie有时候是不完整的，默认调用Document.Cookie也取不到Cookie，其中就是因为有些网站对于关键Cookie做了保护，为Cookie加上了HttpOnly的属性，HttpOnly可以防止cookie被“读取”，这时我们就需要利用WIN API用来辅助获取网站的完整Cookie了。

using System;
using System.ComponentModel;
using System.Net;
using System.Runtime.InteropServices;
using System.Security;
using System.Security.Permissions;
using System.Text;
namespace Freecms
{
internal sealed class NativeMethods
{
#region enums
public enum ErrorFlags
{
ERROR_INSUFFICIENT_BUFFER = 122,
ERROR_INVALID_PARAMETER = 87,
ERROR_NO_MORE_ITEMS = 259
}
public enum InternetFlags
{
INTERNET_COOKIE_<a href="https://stgod.com/tag/http/" title="查看与 HTTP 相关的文章"target="_blank">HTTP</a>ONLY = 8192, //Requires IE 8 or higher
INTERNET_COOKIE_THIRD_PARTY = 131072,
INTERNET_FLAG_RESTRICTED_ZONE = 16
}
#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 = 0;
string url = UriToString(uri);
uint flag = (uint)NativeMethods.InternetFlags.INTERNET_COOKIE_<a href="https://stgod.com/tag/http/" title="查看与 HTTP 相关的文章"target="_blank">HTTP</a>ONLY;
//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), 2083).ToString();
}
}
}

调用方法(webBrowser1.Url为webBrowser1控件登陆后包含cookie信息的Url)：

string pCookie=Freecms.FullWebBrowserCookie.GetCookieInternal(webBrowser1.Url, false);