Flask使用------python算法后端连接c#Winform前端

Flask使用------python算法后端连接c#Winform前端

前提：我的python算法需要传出的是图片，其传入的有时是图片，有时是string（这里只放了前端代码，后端代码在之前的博客里面贴出来啦！）

前端代码：
 		/// <summary>
        ///  通过网络地址和端口访问数据：image型--image型
        /// </summary>
        /// <param name="Url">网络地址</param>
        /// <param name="jsonParas">json参数</param>
        /// <returns></returns>
        public Image RequestsPostImage(string Url, byte[] jsonParas)
        {
            string postContent = "";
            string strUrl = Url;
            Image img = null;

            //创建一个HTTP请求
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(strUrl);
            //Post请求方式
            request.Method = "POST";
            //内容类型
            request.ContentType = "application/json";

            //设置参数，并进行URL编码
            byte[] payLoad = jsonParas;
  
            //设置请求的ContentLength
            request.ContentLength = payLoad.Length;

            //发送请求
            Stream writer;
            try
            {
                //获取用于写入请求数据的Stream对象
                writer = request.GetRequestStream();
            }
            catch (Exception)
            {
                writer = null;
                MessageBox.Show("连接服务器失败");
                return null;
            }
            //将请求参数写入流
            writer.Write(payLoad, 0, payLoad.Length);
            //关闭请求流
            writer.Close();

            HttpWebResponse response;
            try
            {
                //获得响应流
                response = (HttpWebResponse)request.GetResponse();
            }
            catch (WebException ex)
            {
                response = ex.Response as HttpWebResponse;
                postContent = "default: The response is null." + "Exception: " + ex.Message;
                MessageBox.Show(postContent);
            }
            if (response != null)
            {
                try
                {
                    Stream s = response.GetResponseStream();
                    img = Image.FromStream(s);
                }
                catch (Exception e)
                {
                    postContent = "default: The data stream is not readable." + "\r\n" + e.Message;
                    MessageBox.Show(postContent);
                }
            }
            //返回JSON数据
            return img;
        }

        /// <summary>
        ///  通过网络地址和端口访问数据：string型--image型
        /// </summary>
        /// <param name="Url">网络地址</param>
        /// <param name="jsonParas">json参数</param>
        /// <returns></returns>
        public Image RequestsPostString(string Url, string jsonParas)
        {
            string postContent = "";
            string strUrl = Url;
            Image img = null;

            //创建一个HTTP请求
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(strUrl);
            //Post请求方式
            request.Method = "POST";
            //内容类型
            request.ContentType = "application/json";

            //设置参数，并进行URL编码
            string paraUrlCoded = jsonParas;
            byte[] payLoad;
            //将json字符串转化为字节
            payLoad = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);
            //设置请求的ContentLength
            request.ContentLength = payLoad.Length;

            //发送请求
            Stream writer;
            try
            {
                //获取用于写入请求数据的Stream对象
                writer = request.GetRequestStream();
            }
            catch (Exception)
            {
                writer = null;
                MessageBox.Show("连接服务器失败");
                return null;
            }
            //将请求参数写入流
            writer.Write(payLoad, 0, payLoad.Length);
            //关闭请求流
            writer.Close();

            HttpWebResponse response;
            try
            {
                //获得响应流
                response = (HttpWebResponse)request.GetResponse();
            }
            catch (WebException ex)
            {
                response = ex.Response as HttpWebResponse;
                postContent = "default: The response is null." + "Exception: " + ex.Message;
                MessageBox.Show(postContent);
            }
            if (response != null)
            {
                try
                {
                    Stream s = response.GetResponseStream();
                    img = Image.FromStream(s);
                }
                catch (Exception e)
                {
                    postContent = "default: The data stream is not readable." + "\r\n" + e.Message;
                    MessageBox.Show(postContent);
                }
            }
            //返回JSON数据
            return img;
        }