关于微信小程序获取小程序码并接受buffer流保存为图片

前言

  昨天因为小程序功能要获取小程序程序码，看了微信文档爬了好多坑。（留一下记录以防后面被坑）

操作

  因为我获取到了微信那里的图片的图片流一直不知道怎么处理，今天总算找到相关文档，解决了。因为数据流不能直接传给前端，只好把buffer流转成图片保存在服务器上，没办法啊~

废话不多说上代码 

        public static string Api_Post(string postUrl, string postData, WebHeaderCollection header = null,bool isPic=false)
　　　　　{
            Stream outstream = null;
            Stream instream = null;
            StreamReader sr = null;
            HttpWebResponse response = null;
            HttpWebRequest request = null;
            Encoding encoding = Encoding.UTF8;
            byte[] data = encoding.GetBytes(postData);
            // 准备请求...
            try
            {
                // 设置参数
                request = WebRequest.Create(postUrl) as HttpWebRequest;
                CookieContainer cookieContainer = new CookieContainer();
                request.CookieContainer = cookieContainer;
                request.AllowAutoRedirect = true;
                request.Method = "POST";
                request.ContentType = "application/x-www-form-urlencoded";
                if (header != null) request.Headers = header;
                request.ContentLength = data.Length;
                outstream = request.GetRequestStream();
                outstream.Write(data, 0, data.Length);
                outstream.Close();
                //发送请求并获取相应回应数据
                response = request.GetResponse() as HttpWebResponse;
                //直到request.GetResponse()程序才开始向目标网页发送Post请求
                instream = response.GetResponseStream();

                if (isPic)
                {
                    byte[] tt = StreamToBytes(instream);//将数据流转为byte[]
                    System.IO.File.WriteAllBytes(HttpContext.Current.Server.MapPath("~/WxCode.jpg"), tt);
                    WxQRCodeModel model = new WxQRCodeModel();
                    model.data = "192.168.1.216:80/WxCode.jpg";
                    model.errcode = 0;
                    string content = Config.js.Serialize(model);
                    string err = string.Empty;
                    return content;
                }
                else
                {
                    sr = new StreamReader(instream, encoding);
                    //返回结果网页（html）代码
                    string content = sr.ReadToEnd();
                    string err = string.Empty;
                    return content;
                }

            }
            catch (Exception ex)
            {
                if (isPic)
                {
                    sr = new StreamReader(instream, encoding);
                    //返回结果网页（html）代码
                    string content = sr.ReadToEnd();
                    string err = string.Empty;
                    return content;
                }
                else
                {
                    string err = ex.Message;
                    return string.Empty;
                }
            }
        }

因为是instream接受到微信接口那里发送过来的数据流，就在instream那里处理，把数据流转换为byte[]数组，然后依靠File的WriteAllBytes方法把转换OK的byte[]数组转换为图片存放在服务器上，然后把图片路径交给model。

       ///将数据流转为byte[]
        public static byte[] StreamToBytes(Stream stream)
        {
            List<byte> bytes = new List<byte>();
            int temp = stream.ReadByte();
            while (temp != -1)
            {
                bytes.Add((byte)temp);
                temp = stream.ReadByte();
            }
            return bytes.ToArray();
        }

结尾

最近才接触到微信小程序开发，emmmm。觉得自己摸鱼摸得好厉害，不过终于把坑爬出来，特别开心。哈哈哈~以后要多多写开发记录。上班期间码得很随意