获取webbrowser的cookies

[DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)] ???????static extern bool InternetGetCookieEx(string pchURL, string pchCookieName, StringBuilder pchCookieData, ref System.UInt32 pcchCookieData, int dwFlags, IntPtr lpReserved); ???????private static string GetCookies(string url) ???????{ ???????????uint datasize = 1024; ???????????StringBuilder cookieData = new StringBuilder((int)datasize); ???????????if (!InternetGetCookieEx(url, null, cookieData, ref datasize, 0x2000, IntPtr.Zero)) ???????????{ ???????????????if (datasize < 0) ???????????????????return null; ???????????????cookieData = new StringBuilder((int)datasize); ???????????????if (!InternetGetCookieEx(url, null, cookieData, ref datasize, 0x00002000, IntPtr.Zero)) ???????????????????return null; ???????????} ???????????return cookieData.ToString(); ???????}