private static DateTime ExtractDateTime(IoffeVesselDualNavData navData)
{
string dateStr = navData.DateGPS.ToString();
string timeStr = navData.curtime.ToString("D4");
int sec = Convert.ToInt32(timeStr.Substring(timeStr.Length - 2));
timeStr = timeStr.Substring(0, timeStr.Length - 2);
int min = Convert.ToInt32(timeStr.Substring(timeStr.Length - 2));
timeStr = timeStr.Substring(0, timeStr.Length - 2);
int hour = (timeStr.Length > 0) ? (Convert.ToInt32(timeStr)) : (0);
int year = 2000 + Convert.ToInt32(dateStr.Substring(dateStr.Length - 2, 2));
dateStr = dateStr.Substring(0, dateStr.Length - 2);
int month = Convert.ToInt32(dateStr.Substring(dateStr.Length - 2, 2));
dateStr = dateStr.Substring(0, dateStr.Length - 2);
int day = Convert.ToInt32(dateStr);
DateTime dt = new DateTime(year, month, day, hour, min, sec, DateTimeKind.Utc);
return(dt);
}
public static Tuple <DateTime, DateTime> GetNavFileDateTimeMargins(string InputFilename)
{
int bytesCountPerObj = Marshal.SizeOf(typeof(IoffeVesselDualNavData));
long fileLength = (new FileInfo(InputFilename)).Length;
if (fileLength < (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);
}
byte[] buf1st = reader.ReadBytes(bytesCountPerObj);
GCHandle handle1st = GCHandle.Alloc(buf1st, GCHandleType.Pinned);
IoffeVesselDualNavData record1st =
(IoffeVesselDualNavData)
Marshal.PtrToStructure(handle1st.AddrOfPinnedObject(), typeof(IoffeVesselDualNavData));
DateTime dt1 = ExtractDateTime(record1st);
reader.BaseStream.Seek(-bytesCountPerObj, SeekOrigin.End);
byte[] buf2nd = reader.ReadBytes(bytesCountPerObj);
GCHandle handle2nd = GCHandle.Alloc(buf2nd, GCHandleType.Pinned);
IoffeVesselDualNavData record2nd =
(IoffeVesselDualNavData)
Marshal.PtrToStructure(handle2nd.AddrOfPinnedObject(), typeof(IoffeVesselDualNavData));
DateTime dt2 = ExtractDateTime(record2nd);
reader.Close();
return(new Tuple <DateTime, DateTime>(dt1, dt2));
}
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);
}
