继上一篇文章，由于本地限制，等后续整理在一起

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参考例子：

 byte[] image = File.ReadAllBytes(Environment.CurrentDirectory + @"\AnswerCode.gif");       var param = new Dictionary<object, object>      {                                                                     {"username","test123"},                                                       {"password","123456"},                                                       {"typeid","3040"},                                                      {"timeout","90"}       };    string _tempcodehtml = "";    _tempcodehtml = httph.PostImage(urlcode, param, image);

Http获取图片，既可以通过链接地址，直接用Image的Location=URL也可以将图片流获取到本地，这样请求可以得到图片的Cookie，以便有些验证码存储在Cookie中，可以模拟验证码。

public Bitmap GetImage(string url, ref CookieContainer cookie, string refer)        {            HttpWebRequest hrq = (HttpWebRequest)WebRequest.Create(url);            hrq.Method = "GET";            try            {                HttpWebResponse hrp = (HttpWebResponse)hrq.GetResponse();                System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(hrp.GetResponseStream());                if (cookie == null)                {                    cookie.GetCookies(hrq.RequestUri);                }                hrp.Close();                return bmp;            }            catch (Exception)            {                return null;            }        }

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