private List<Track> GetTrackList(string trackListUrl)

        {

            List<track> list = new List<track>();

            FileStream file = new FileStream(trackListUrl, FileMode.Open, FileAccess.ReadWrite);

            int b = Marshal.SizeOf(typeof(s_NV_FILEHEAD));

            byte[] buffer = new byte[b];

            file.Read(buffer, 0, b);

            s_NV_FILEHEAD gpsHead = (s_NV_FILEHEAD)RawDeserialize(buffer, typeof(s_NV_FILEHEAD));

            byte[] bytData = new byte[Marshal.SizeOf(typeof(s_NV_All))];

            List<s_NV_All> s = new List<s_NV_All>();

            while (file.Read(bytData, 0, bytData.Length) > 0)

            {

                s_NV_GPS_All all = (s_NV_All)RawDeserialize(bytData, typeof(s_NV_All));

                Track a = new Track

                {                   

                    Time = all.szTime

                };

                list.Add(a);

            }

            file.Close();

            return list;

        }

      

        private object RawDeserialize(byte[] rawdatas, Type anytype)

        {

            int rawsize = Marshal.SizeOf(anytype);

            if (rawsize > rawdatas.Length)

                return null;

            IntPtr buffer = Marshal.AllocHGlobal(rawsize);

            Marshal.Copy(rawdatas, 0, buffer, rawsize);

            object retobj = Marshal.PtrToStructure(buffer, anytype);

       &