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 NmeaGpRmcMessage message)
{
if (data == null)
{
throw new ArgumentNullException(nameof(data));
}
string[] values = data.Split(',');
if (values.Length != 12)
{
message = default(NmeaGpRmcMessage);
return(false);
}
string timeUtcString = values[0];
string statusString = values[1];
string latitudeString = values[2];
string latitudeNS = values[3];
string longitudeString = values[4];
string longitudeEW = values[5];
string speedOverGroundString = values[6];
string courseOverGroundString = values[7];
string dateUtcString = values[8];
DateTime dateTimeUtc;
bool statusIsWarning;
decimal? latitude = null;
decimal? longitude = null;
decimal? speedOverGround = null;
decimal? courseOverGround = null;
if (!DateTime.TryParseExact(dateUtcString + timeUtcString, "ddMMyyHHmmss.ff", CultureInfo.InvariantCulture, DateTimeStyles.AssumeLocal, out dateTimeUtc))
{
message = default(NmeaGpRmcMessage);
return(false);
}
switch (statusString)
{
case "A":
statusIsWarning = false;
break;
case "V":
statusIsWarning = true;
break;
default:
message = default(NmeaGpRmcMessage);
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(NmeaGpRmcMessage);
return(false);
}
switch (latitudeNS)
{
case "N":
south = false;
break;
case "S":
south = true;
break;
default:
message = default(NmeaGpRmcMessage);
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(NmeaGpRmcMessage);
return(false);
}
switch (longitudeEW)
{
case "E":
west = false;
break;
case "W":
west = true;
break;
default:
message = default(NmeaGpRmcMessage);
return(false);
}
decimal degrees = Math.Floor(longitudeValue / 100m);
decimal minutes = longitudeValue % 100;
longitude = (west ? -1m : 1m) * (degrees + minutes / 60m);
}
if (!string.IsNullOrWhiteSpace(speedOverGroundString))
{
decimal speedOverGroundValue;
if (!decimal.TryParse(speedOverGroundString, NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture, out speedOverGroundValue))
{
message = default(NmeaGpRmcMessage);
return(false);
}
speedOverGround = speedOverGroundValue * 0.514444m;
}
if (!string.IsNullOrWhiteSpace(courseOverGroundString))
{
decimal courseOverGroundValue;
if (!decimal.TryParse(courseOverGroundString, NumberStyles.AllowDecimalPoint, CultureInfo.InvariantCulture, out courseOverGroundValue))
{
message = default(NmeaGpRmcMessage);
return(false);
}
courseOverGround = courseOverGroundValue;
}
message = new NmeaGpRmcMessage(data, dateTimeUtc, statusIsWarning, latitude, longitude, speedOverGround, courseOverGround);
return(true);
}
