關於微信小程序獲取小程序碼並接受buffer流保存為圖片

前言

  昨天因為小程序功能要獲取小程序程序碼，看了微信文檔爬了好多坑。（留一下記錄以防后面被坑）

操作

  因為我獲取到了微信那里的圖片的圖片流一直不知道怎么處理，今天總算找到相關文檔，解決了。因為數據流不能直接傳給前端，只好把buffer流轉成圖片保存在服務器上，沒辦法啊~

廢話不多說上代碼 

 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); // 准備請求...
            try { // 設置參數
                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(); //發送請求並獲取相應回應數據
                response = request.GetResponse() as HttpWebResponse; //直到request.GetResponse()程序才開始向目標網頁發送Post請求
                instream = response.GetResponseStream();
 if (isPic) { byte[] tt = StreamToBytes(instream);//將數據流轉為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); //返回結果網頁（html）代碼
                    string content = sr.ReadToEnd(); string err = string.Empty; return content; } } catch (Exception ex) { if (isPic) { sr = new StreamReader(instream, encoding); //返回結果網頁（html）代碼
                    string content = sr.ReadToEnd(); string err = string.Empty; return content; } else { string err = ex.Message; return string.Empty; } } }

因為是instream接受到微信接口那里發送過來的數據流，就在instream那里處理，把數據流轉換為byte[]數組，然后依靠File的WriteAllBytes方法把轉換OK的byte[]數組轉換為圖片存放在服務器上，然后把圖片路徑交給model。

       ///將數據流轉為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();
        }

結尾

最近才接觸到微信小程序開發，emmmm。覺得自己摸魚摸得好厲害，不過終於把坑爬出來，特別開心。哈哈哈~以后要多多寫開發記錄。上班期間碼得很隨意