public static bool TryParse(string rawNmeaRmcString, out RmcData rmcData)
{
try
{
rmcData = Parse(rawNmeaRmcString);
return(true);
}
catch
{
rmcData = null;
return(false);
}
}
//=======================================================================
//=======================================================================
private static GpsReading ParseSentences(string[] sentences)
{
//---- declare vars
GpsReading gpsReading = new GpsReading();
//---- loop through each sentence
for (int i = 0; i < sentences.Length; i++)
{
//---- if the sentence has a header and data
if (sentences[i].Length > 6)
{
switch (sentences[i].Trim().Substring(0, 6).ToUpper())
{
case "$GPGSA":
gpsReading.DopActiveSatellites = GsaData.Parse(sentences[i]);
break;
case "$GPGSV":
gpsReading.SatellitesInView.Add(GsvData.Parse(sentences[i]));
break;
case "$GPGGA":
gpsReading.FixedGpsData = GgaData.Parse(sentences[i]);
break;
case "$GPRMC":
gpsReading.Summary = RmcData.Parse(sentences[i]);
break;
case "$GPMSS":
break;
case "$GPVTG":
break;
}
}
}
//---- return our parsed gps reading
return(gpsReading);
}
//=======================================================================
//=======================================================================
#region -= constructors =-
#endregion
//=======================================================================
//=======================================================================
#region -= public methods =-
#endregion
//=======================================================================
//=======================================================================
#region -= static methods =-
public static RmcData Parse(string inputString)
{
//---- declare vars
RmcData rmcData = new RmcData();
string dataString = inputString.Substring(0, inputString.IndexOf('*')); // strip off the checksum
string[] values = dataString.Split(',');
//---- if we don't have 12 (header + 11), it's no good
if (values.Length < 12)
{
throw new FormatException();
}
//---- Status
if (values[2].ToUpper() == "A")
{
rmcData.Status = Status.Valid;
}
else
{
rmcData.Status = Status.Invalid;
}
if (rmcData.Status == Status.Invalid)
{
return(rmcData);
}
if (values[1].Length == 6 && values[9].Length == 6)
{//---- if the date and time both are six digits
//---- make sure that they're actually numbers
int temp;
bool isparse = true;
try
{
temp = int.Parse(values[1]);
temp = int.Parse(values[9]);
}
catch (ArgumentException)
{
isparse = false;
}
if (isparse)
{
//---- should add more validation here
int day = int.Parse(values[9].Substring(0, 2));
int month = int.Parse(values[9].Substring(2, 2));
int year = int.Parse(values[9].Substring(4, 2));
int hour = int.Parse(values[1].Substring(0, 2));
int minute = int.Parse(values[1].Substring(2, 2));
int second = int.Parse(values[1].Substring(4, 2));
rmcData.UtcDateTime = new DateTime(year, month, day, hour, minute, second);
}
else
{
throw new FormatException("Date or time string is invalid");
}
}
else if (values[1].Length == 10 && values[9].Length == 6)
{//---- if the date and time both are six digits
//---- make sure that they're actually numbers
int temp;
double timeTemp;
bool isparse = true;
try
{
timeTemp = double.Parse(values[1]);
temp = int.Parse(values[9]);
}
catch (ArgumentException)
{
isparse = false;
}
if (isparse)
{
//---- should add more validation here
int day = int.Parse(values[9].Substring(0, 2));
int month = int.Parse(values[9].Substring(2, 2));
int year = int.Parse(values[9].Substring(4, 2));
int hour = int.Parse(values[1].Substring(0, 2));
int minute = int.Parse(values[1].Substring(2, 2));
int second = int.Parse(values[1].Substring(4, 2));
int millisecond = int.Parse(values[1].Substring(7, 3));
rmcData.UtcDateTime = new DateTime(year, month, day, hour, minute, second);
}
else
{
throw new FormatException("Date or time string is invalid");
}
}
else
{
throw new FormatException("Date or time string is invalid");
}
//---- lat/long position
rmcData.Position = Position.Parse(values[3] + "," + values[4] + ";" + values[5] + "," + values[6]);
//---- speed in knots
rmcData.GroundSpeed = Decimal.Parse(values[7]);
//---- true course
rmcData.Heading = Decimal.Parse(values[8]);
//---- magnetic declination
rmcData.MagneticVariation = MagneticVariation.Parse(values[10] + "," + values[11]);
//---- return
return(rmcData);
//1 220516 Time Stamp
//2 A validity - A-ok, V-invalid
//3 5133.82 current Latitude
//4 N North/South
//5 00042.24 current Longitude
//6 W East/West
//7 173.8 Speed in knots
//8 231.8 True course
//9 130694 Date Stamp
//10 004.2 Variation
//11 W East/West
//12 *70 checksum
}
