public static IoffeVesselDualNavDataConverted GetNavDataByDatetime(string navDataFilesPath, DateTime dt)
{
if (navDataFilesPath == "")
{
return(null);
}
else if (!Directory.Exists(navDataFilesPath))
{
return(null);
}
TimeSpan span = new TimeSpan(0, 2, 0);
List <IoffeVesselDualNavDataConverted> lAllNavData = new List <IoffeVesselDualNavDataConverted>();
string[] sNavFilenames = Directory.GetFiles(navDataFilesPath, "*.nv2, *.nav", SearchOption.AllDirectories);
if (!sNavFilenames.Any())
{
return(null);
}
foreach (string navFilename in sNavFilenames)
{
Tuple <DateTime, DateTime> timeSpan =
GetNavFileDateTimeMargins(navFilename);
if (timeSpan == null)
{
continue;
}
if ((dt < timeSpan.Item1) || (dt > timeSpan.Item2))
{
continue;
}
List <IoffeVesselDualNavDataConverted> dataHasBeenRead = ReadNavFile(navFilename);
if (dataHasBeenRead == null)
{
continue;
}
lAllNavData.AddRange(dataHasBeenRead);
}
if (!lAllNavData.Any())
{
return(null);
}
lAllNavData.Sort((gpsRecord1, gpsRecord2) =>
{
double dev1 = Math.Abs((gpsRecord1.gps.dateTimeUTC - dt).TotalMilliseconds);
double dev2 = Math.Abs((gpsRecord2.gps.dateTimeUTC - dt).TotalMilliseconds);
return((dev1 >= dev2) ? (1) : (-1));
});
IoffeVesselDualNavDataConverted retData = new IoffeVesselDualNavDataConverted()
{
dateTime = lAllNavData[0].dateTime,
gps = lAllNavData[0].gps,
};
return(retData);
}
public static List <IoffeVesselDualNavDataConverted> ReadNavFile(string InputFilename) //, bool readOnlyThe1stRecord = false)
{
int bytesCountPerObj = Marshal.SizeOf(typeof(IoffeVesselDualNavData));
if ((new FileInfo(InputFilename)).Length < (4 + bytesCountPerObj))
{
return(null);
}
BinaryReader reader = new BinaryReader(File.Open(InputFilename, FileMode.Open, FileAccess.Read, FileShare.Read));
char[] dualmode = reader.ReadChars(4);
if (new string(dualmode) != "Dual")
{
// неправильный файл навигации - данные не в том формате
return(null);
}
reader.Close();
byte[] fileData = File.ReadAllBytes(InputFilename);
reader = new BinaryReader(new MemoryStream(fileData));
reader.ReadChars(4);
List <IoffeVesselDualNavData> lFileNavData = new List <IoffeVesselDualNavData>();
int structCount = Convert.ToInt32((fileData.Count() - 4) / bytesCountPerObj);
if (structCount == 0)
{
return(null);
}
int readStructs = 0;
while (true)
{
//Stream stream = reader.BaseStream;
long currPosition = reader.BaseStream.Position;
try
{
//char[] possibleDualModeSign = reader.ReadChars(4);
byte[] read4bytes = reader.ReadBytes(4);
string possibleDualModeSign = System.Text.Encoding.Default.GetString(read4bytes);
if (possibleDualModeSign.ToLower() != "dual")
{
// вернуть позицию на 4 назад
//reader.BaseStream.Seek(-4, SeekOrigin.Current);
reader.BaseStream.Seek(currPosition, SeekOrigin.Begin);
}
}
catch (Exception ex)
{
;
}
byte[] readBuffer = new byte[bytesCountPerObj];
readBuffer = reader.ReadBytes(bytesCountPerObj);
GCHandle handle = GCHandle.Alloc(readBuffer, GCHandleType.Pinned);
IoffeVesselDualNavData curRecord =
(IoffeVesselDualNavData)
Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(IoffeVesselDualNavData));
readStructs++;
lFileNavData.Add(curRecord);
//if ((readStructs >= structCount) || (readOnlyThe1stRecord))
if (readStructs >= structCount)
{
break;
}
}
List <IoffeVesselDualNavDataConverted> lRetList = lFileNavData.ConvertAll(navData =>
{
IoffeVesselDualNavDataConverted retNavData = new IoffeVesselDualNavDataConverted();
#region // -> ExtractDateTime()
//string dateStr = navData.DateGPS.ToString();
//string timeStr = navData.curtime.ToString("D4");
//DateTime dt;
//if (navData.curtime >= 2400)
//{
// int daysToAdd = 0;
// while (navData.curtime >= 2400)
// {
// navData.curtime -= 2400;
// daysToAdd ++;
// }
// timeStr = (navData.curtime).ToString("D4");
// dt = new DateTime(2000 + Convert.ToInt32(dateStr.Substring(dateStr.Length - 2, 2)),
// Convert.ToInt32(dateStr.Substring(dateStr.Length - 4, 2)),
// Convert.ToInt32(dateStr.Substring(0, dateStr.Length - 4)),
// Convert.ToInt32(timeStr.Substring(0, 2)),
// Convert.ToInt32(timeStr.Substring(2, 2)),
// 0);
// dt = dt.AddDays(daysToAdd);
//}
//else
//{
// dt = new DateTime(2000 + Convert.ToInt32(dateStr.Substring(dateStr.Length - 2, 2)),
// Convert.ToInt32(dateStr.Substring(dateStr.Length - 4, 2)),
// Convert.ToInt32(dateStr.Substring(0, dateStr.Length - 4)),
// Convert.ToInt32(timeStr.Substring(0, 2)),
// Convert.ToInt32(timeStr.Substring(2, 2)),
// 0);
//}
#endregion // -> ExtractDateTime()
retNavData.dateTime = ExtractDateTime(navData);
GPSdata curGPS = new GPSdata()
{
GPSstring = "",
lat = (double)navData.Lat,
latHemisphere = "" + navData.SimLat,
lon = (double)navData.Lon,
lonHemisphere = "" + navData.SimLon,
dateTimeUTC = retNavData.dateTime,
validGPSdata = true,
IOFFEdataHeadingTrue = navData.trueHead,
IOFFEdataHeadingGyro = navData.Gyro,
IOFFEdataSpeedKnots = navData.Speed,
IOFFEdataDepth = navData.Depth,
dataSource = GPSdatasources.IOFFEvesselDataServer
};
retNavData.gps = curGPS;
retNavData.Course = navData.Course;
return(retNavData);
});
return(lRetList);
}