关于微信小程序获取小程序码并接受buffer流保存为图片的方法

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