C#HttpWebRequest获取人人网验证码

public void GetVerImage() { HttpWebRequest request = null; HttpWebResponse response = null; string gethost = string.Empty; CookieContainer cc = new CookieContainer(); string Cookiesstr = string.Empty; try {request = (HttpWebRequest)WebRequest.Create(" http://icode.renren.com/getcode.do?t=login&rnd=Math.random()"); request.CookieContainer = cc;request.Method = "GET"; request.Accept = "application/x-ms-application, image/jpeg, application/xaml+xml, image/gif, image/pjpeg, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*"; request.UserAgent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.3; .NET4.0C; .NET4.0E)"; request.ContentType = "image/jpeg"; response = (HttpWebResponse)request.GetResponse(); Stream responseStream = response.GetResponseStream(); Image original = Image.FromStream(responseStream); Bitmap bitMap = new Bitmap(original); this.pictureBox1.Image = bitMap; CookieCollection cook = response.Cookies; textBox1.Text = request.CookieContainer.GetCookieHeader(request.RequestUri); responseStream.Close(); }