C#利用WebBrowser获取完整COOKIE

代码：

http://www.cnblogs.com/hsapphire/archive/2010/09/10/1823384.html

http://blog.csdn.net/attilax/article/details/8595036

  [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);

        [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
        static extern int InternetSetCookieEx(string lpszURL, string lpszCookieName, string lpszCookieData, int dwFlags, IntPtr dwReserved);

  WebBrowser browser = (WebBrowser)sender;
            HtmlDocument doc = browser.Document;

            this.Text = doc.Title;
            string url = doc.Url.AbsoluteUri;
            //string cookies2 = GetCookies(url);

            //保留cookie
           // cookieString = doc.Cookie;
            cookieString = GetCookies(url);

 
       private static string GetCookies(string url)
        {
            uint datasize = 256;
            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();
        }