private void SaveJsonToFile(long timeStamp, string json)
        {
            DateTime now = GetDataTime(timeStamp);
            FileInfo fi  = CameraAlarmService.GetJsonFile(now);

            File.WriteAllText(fi.FullName, json);//yyyy_mm_dd_HH_MM_ss_fff=>yyyy_MM_dd_HH_mm_ss_fff
        }
        public void AlarmSaveToJson(CameraAlarmJson camera)
        {
            byte[]          byte1 = camera.Json;
            string          json  = Encoding.UTF8.GetString(byte1);
            CameraAlarmInfo info  = CameraAlarmInfo.Parse(json);

            info.id = camera.Id; //增加了id,这样能够获取到详情

            string pic = info.pic_data;

            DateTime now = GetDataTime(info.time_stamp);
            FileInfo fi  = CameraAlarmService.GetJsonFile(now);
        }