//=======================================================================
//=======================================================================
public static bool TryParse(string inputString, out GgaData ggaData)
{
try
{
ggaData = Parse(inputString);
return(true);
}
catch
{
ggaData = 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 -= static methods =-
//=======================================================================
public static GgaData Parse(string inputString)
{
//---- declare vars
GgaData data = new GgaData();
string dataString = inputString.Substring(0, inputString.IndexOf('*')); // strip off the checksum
string[] values = dataString.Split(',');
//---- if we don't have 15 (header + 14), it's no good
if (values.Length < 15)
{
throw new FormatException();
}
if (values[1].Length == 6)
{//---- if the time is six digits
//---- make sure that they're actually numbers
int temp;
bool isparse = true;
try
{
temp = int.Parse(values[1]);
}
catch (ArgumentException)
{
isparse = false;
}
if (isparse)
{
//---- should add more validation here
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));
data.UtcTime = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, hour, minute, second);
}
else
{
throw new FormatException("Date or time string is invalid");
}
}
else if (values[1].Length == 10)
{//---- if the time is ten digits
//---- make sure that they're actually numbers
double temp;
bool isparse = true;
try
{
temp = double.Parse(values[1]);
}
catch (ArgumentException)
{
isparse = false;
}
if (isparse)
{
//---- should add more validation here
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 milliseconds = int.Parse(values[1].Substring(7, 3));
data.UtcTime = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, hour, minute, second, milliseconds);
}
else
{
throw new FormatException("Date or time string is invalid");
}
}
else
{
throw new FormatException("Date or time string is invalid");
}
//---- quality
data.Quality = (Quality)Enum.Parse(typeof(Quality), values[6], true);
if (data.Quality == Quality.Invalid)
{
return(data);
}
//---- lat/long position
data.Position = Position.Parse(values[2] + "," + values[3] + ";" + values[4] + "," + values[5]);
//---- number of satellites
data.NumberOfSatelitesInUse = int.Parse(values[7]);
//---- HDOP
data.HorizontalDilutionOfPrecision = (string.IsNullOrEmpty(values[8]) ? 0 : decimal.Parse(values[8]));
//---- elevation
data.Elevation = Elevation.Parse(values[9] + "," + values[10]);
//---- geoidal separation
data.GeoidalSeparation = GeoidalSeparation.Parse(values[11] + "," + values[12]);
//---- age
data.DifferenceCorrection.Age = (string.IsNullOrEmpty(values[13]) ? 0M : decimal.Parse(values[13]));
//---- station ID
data.DifferenceCorrection.StationID = (string.IsNullOrEmpty(values[14]) ? 0 : int.Parse(values[14]));
//---- return
return(data);
//eg3. $GPGGA,hhmmss.ss,llll.ll,a,yyyyy.yy,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxx*hh
//1 = UTC of Position
//2 = Latitude
//3 = N or S
//4 = Longitude
//5 = E or W
//6 = GPS quality indicator (0=invalid; 1=GPS fix; 2=Diff. GPS fix)
//7 = Number of satellites in use [not those in view]
//8 = Horizontal dilution of position
//9 = Antenna altitude above/below mean sea level (geoid)
//10 = Meters (Antenna height unit)
//11 = Geoidal separation (Diff. between WGS-84 earth ellipsoid and
// mean sea level. -=geoid is below WGS-84 ellipsoid)
//12 = Meters (Units of geoidal separation)
//13 = Age in seconds since last update from diff. reference station
//14 = Diff. reference station ID#
//15 = Checksum
}