WINFROM获取网页上的图像流数据

   /// <summary>

        /// GetStream 获取网页流对象

        /// </summary>

        /// <param name="url">要获取的网页地址</param>

        /// <param name="refer">来源网址</param>

        /// <param name="timeout">请求超时时间</param>

        /// <param name="encode">网页编码方式</param>

        /// <param name="cookie">Cookie 对象</param>

        /// <param name="myproxy">代理对象</param>

        /// <param name="err">接收错误信息字符串</param>

        /// <returns>网页流对象</returns>

        public static Stream GetStream(string url, string refer, int timeout, Encoding encode, ref CookieContainer cookie, WebProxy myproxy, out string err)

        {

            Stream stream = null;

            err = "";

            try

            {

                HttpWebResponse response = null;

                HttpWebRequest request = null;

                //如果是发送HTTPS请求

                if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))

                {

                    ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);

                    request = WebRequest.Create(url) as HttpWebRequest;

                }

                else

                {

                    request = (HttpWebRequest)WebRequest.Create(url);

                }

                HttpRequestCachePolicy noCachePolicy = new HttpRequestCachePolicy(HttpRequestCacheLevel.NoCacheNoStore);

                request.ProtocolVersion = HttpVersion.Version10;

                if (cookie == null) cookie = new CookieContainer();

                request.CookieContainer = cookie;

                request.CachePolicy = noCachePolicy;

                request.Proxy = myproxy;

                request.KeepAlive = false;

                request.ServicePoint.ConnectionLimit = int.MaxValue;

                request.Accept = "text/html, application/xhtml+xml, */*";

                request.Timeout = timeout;

                request.Method = "GET";

                request.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 2.0.50727;)";

                request.Referer = refer;

                response = (HttpWebResponse)request.GetResponse();

                cookie = request.CookieContainer;

                stream = response.GetResponseStream();

                return stream;

            }

            catch (Exception ex)

            {

                err = ex.Message;

                return null;

            }
        }

//--------------------------------测试

 CookieContainer cookie = new CookieContainer();

            string err;

            Stream stream = GetStream("http://www.liantu.com/tiaoma/eantitle.php?title=Zy9YSzJhWVJQU2ZZdGZ0Q2F1eWdIQ1dVNXp3VjNUS29vcFBYU2JhNWJlTWdMWE0yQnpwT1J3PT0=", "", 10000, Encoding.UTF8, ref cookie, null, out err);

            try

            {

                Bitmap bmp = (Bitmap)Image.FromStream(stream);

                SetTdCtl(linklab_result, VCode.GetVCode(bmp, 4), true, null);

                SetTdCtl(pic_code, null, true, new Bitmap(bmp));

            }

            catch { SetTdCtl(linklab_result, "错误", true, null); }