C# .net 后端 生成微信小程序图片 arrayBufferToBase64 转图片_c# 微信小程序码转成图片

    
 
 
    /// <summary>
        /// B接口-微信小程序带参数二维码的生成
        /// </summary>
        /// <param name="strJson"> 你要传入的参数 例如： {"path":"pages/PersonalCenter/QrUserInfo/QrUserInfo"}</param>
        /// <param name="token"></param>
        /// <returns></returns>
        public static string CreateWxCode(string strJson, string token)
        {
            string ret = string.Empty;
            try
            {
                string DataJson = string.Empty;
                string url = "https://api.weixin.qq.com/wxa/getwxacode?access_token=" + token;
               ret = PostMoths(url, strJson);
                if (ret.Length > 0)
                {
                    //对图片进行存储操作，下次可直接调用你存储的图片，不用再调用接口
                }
            }
            catch (Exception e)
            { ret = e.Message; }
            return ret;//返回图片地址
        }
 
//请求处理，返回二维码图片
        public static string PostMoths(string url, string param)
        {
            string strURL = url;
            System.Net.HttpWebRequest request;
            request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);
            request.Method = "POST";
            request.ContentType = "application/json;charset=UTF-8";
            string paraUrlCoded = param;
            byte[] payload;
            payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);
            request.ContentLength = payload.Length;
            Stream writer = request.GetRequestStream();
            writer.Write(payload, 0, payload.Length);
            writer.Close();
            System.Net.HttpWebResponse response;
            response = (System.Net.HttpWebResponse)request.GetResponse();
            System.IO.Stream s;
            s = response.GetResponseStream();//返回图片数据流
            byte[] tt = StreamToBytes(s);//将数据流转为byte[]
            string imgName = DateTime.Now.ToString("yyyyMMddhhmmss") + ".jpg";
            string patn = @"d:\" + imgName;
            System.IO.File.WriteAllBytes(patn + imgName, tt); 
            return patn;
        }