public static NmeaMessage Create(string address, string data)
{
switch (address)
{
case "GPRMC":
NmeaGpRmcMessage gpRmcMessage;
if (NmeaGpRmcMessage.TryParse(data, out gpRmcMessage))
{
return(gpRmcMessage);
}
throw new FormatException("Failed to parse GPRMC message data.");
case "GPGGA":
NmeaGpGgaMessage gpGgaMessage;
if (NmeaGpGgaMessage.TryParse(data, out gpGgaMessage))
{
return(gpGgaMessage);
}
throw new FormatException("Failed to parse GPGGA message data.");
default:
return(new NmeaMessage(address, data));
}
}
public static bool TryParse(string data, out NmeaGpGgaMessage message)
{
if (data == null)
{
throw new ArgumentNullException(nameof(data));
}
string[] values = data.Split(',');
if (values.Length != 14)
{
message = default(NmeaGpGgaMessage);
return(false);
}
string timeUtcString = values[0];
string latitudeString = values[1];
string latitudeNS = values[2];
string longitudeString = values[3];
string longitudeEW = values[4];
string statusString = values[5];
string satellitesUsedString = values[6];
string horizontalDilutionOfPrecisionString = values[7];
string altitudeString = values[8];
string geoidSeparationString = values[10];
DateTime dateTimeUtc;
decimal? latitude = null;
decimal? longitude = null;
bool statusIsValid;
int? satellitesUsed = null;
decimal? horizontalDilutionOfPrecision = null;
decimal? altitude = null;
decimal? geoidSeparation = null;
if (!DateTime.TryParseExact(timeUtcString, "HHmmss.ff", CultureInfo.InvariantCulture, DateTimeStyles.AssumeLocal, out dateTimeUtc))
{
message = default(NmeaGpGgaMessage);
return(false);
}
if (!string.IsNullOrWhiteSpace(latitudeString) &&
!string.IsNullOrWhiteSpace(latitudeNS))
{
decimal latitudeValue;
bool south;
if (!decimal.TryParse(latitudeString, NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture, out latitudeValue))
{
message = default(NmeaGpGgaMessage);
return(false);
}
switch (latitudeNS)
{
case "N":
south = false;
break;
case "S":
south = true;
break;
default:
message = default(NmeaGpGgaMessage);
return(false);
}
decimal degrees = Math.Floor(latitudeValue / 100m);
decimal minutes = latitudeValue % 100;
latitude = (south ? -1m : 1m) * (degrees + minutes / 60m);
}
if (!string.IsNullOrWhiteSpace(longitudeString) &&
!string.IsNullOrWhiteSpace(longitudeEW))
{
decimal longitudeValue;
bool west;
if (!decimal.TryParse(longitudeString, NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture, out longitudeValue))
{
message = default(NmeaGpGgaMessage);
return(false);
}
switch (longitudeEW)
{
case "E":
west = false;
break;
case "W":
west = true;
break;
default:
message = default(NmeaGpGgaMessage);
return(false);
}
decimal degrees = Math.Floor(longitudeValue / 100m);
decimal minutes = longitudeValue % 100;
longitude = (west ? -1m : 1m) * (degrees + minutes / 60m);
}
switch (statusString)
{
case "0":
statusIsValid = false;
break;
case "1":
statusIsValid = true;
break;
default:
message = default(NmeaGpGgaMessage);
return(false);
}
if (!string.IsNullOrWhiteSpace(satellitesUsedString))
{
int satellitesUsedValue;
if (!int.TryParse(satellitesUsedString, NumberStyles.Integer, CultureInfo.InvariantCulture, out satellitesUsedValue))
{
message = default(NmeaGpGgaMessage);
return(false);
}
satellitesUsed = satellitesUsedValue;
}
if (!string.IsNullOrWhiteSpace(horizontalDilutionOfPrecisionString))
{
decimal horizontalDilutionOfPrecisionValue;
if (!decimal.TryParse(horizontalDilutionOfPrecisionString, NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture, out horizontalDilutionOfPrecisionValue))
{
message = default(NmeaGpGgaMessage);
return(false);
}
horizontalDilutionOfPrecision = horizontalDilutionOfPrecisionValue;
}
if (!string.IsNullOrWhiteSpace(altitudeString))
{
decimal altitudeValue;
if (!decimal.TryParse(altitudeString, NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture, out altitudeValue))
{
message = default(NmeaGpGgaMessage);
return(false);
}
altitude = altitudeValue;
}
if (!string.IsNullOrWhiteSpace(geoidSeparationString))
{
decimal geoidSeparationValue;
if (!decimal.TryParse(geoidSeparationString, NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture, out geoidSeparationValue))
{
message = default(NmeaGpGgaMessage);
return(false);
}
geoidSeparation = geoidSeparationValue;
}
message = new NmeaGpGgaMessage(data, dateTimeUtc.TimeOfDay, statusIsValid, latitude, longitude, satellitesUsed, horizontalDilutionOfPrecision, altitude, geoidSeparation);
return(true);
}
