public NmeaMessage ParseLine(string line)
{
if ((line == null) || (line.Length <= 0))
{
return(null);
}
NmeaMessage outMessage = null;
try
{
int csIndex = line.LastIndexOf('*');
if (csIndex <= 0)
{
return(null);
}
csIndex++;
if (csIndex >= line.Length)
{
return(null);
}
string cs = line.Substring(csIndex, line.Length - csIndex);
string tempLine = line.Substring(0, csIndex - 1);
string[] parts = tempLine.ToUpper().Split(',');
if (parts.Length <= 0)
{
return(null);
}
if (!ValidateChecksum(tempLine, cs))
{
return(null);
}
foreach (NmeaMessage message in _handlers)
{
if (message.IsApplicable(parts))
{
outMessage = message.CreateEmpty();
outMessage.FromNmea(parts);
break;
}
}
}
catch (Exception ex)
{
outMessage = new Error(line, ex);
}
return(outMessage);
}
private bool CanSetPositionFromMessage(NmeaMessage message)
{
switch (message.Id)
{
case NmeaMessageType.GGA:
ParseCGA(message);
break;
case NmeaMessageType.RMC:
ParseRMC(message);
break;
}
return(message.Id == CycleStartMsgType);
}
private void ParseRMC(NmeaMessage message)
{
var f = (NmeaField)message.Fields[RMC.FieldIds.Status];
double longitude = 0, latitude = 0;
if ((f != null) && f.HasValue)
{
char status = f.GetChar((char)0);
if (status != 'A')
{
return;
}
f = (NmeaField)message.Fields[RMC.FieldIds.X];
if ((f != null) && f.HasValue)
{
longitude = f.GetDouble(_position.Coordinate.Longitude);
}
f = (NmeaField)message.Fields[RMC.FieldIds.Y];
if ((f != null) && f.HasValue)
{
latitude = f.GetDouble(_position.Coordinate.Latitude);
}
f = (NmeaField)message.Fields[RMC.FieldIds.Utc];
if ((f != null) && f.HasValue)
{
_position.Time = f.GetTime(_position.Time);
}
f = (NmeaField)message.Fields[RMC.FieldIds.Date];
if ((f != null) && f.HasValue)
{
_position.Date = f.GetDate(_position.Date);
}
f = (NmeaField)message.Fields[RMC.FieldIds.Speed];
if ((f != null) && f.HasValue)
{
_position.Speed = f.GetDouble(_position.Speed);
}
f = (NmeaField)message.Fields[RMC.FieldIds.Course];
if ((f != null) && f.HasValue)
{
_position.Course = f.GetDouble(_position.Course);
}
}
_position.Coordinate = new GeoCoordinate((float)latitude, (float)longitude);
}
private void ParseCGA(NmeaMessage message)
{
GeoPosition position = new GeoPosition();
double longitude = 0, latitude = 0;
var f = (NmeaField)message.Fields[GGA.FieldIds.PositionFixIndicator];
if ((f != null) && f.HasValue)
{
position.PositionFixIndicator = f.GetInt(position.PositionFixIndicator);
}
f = (NmeaField)message.Fields[GGA.FieldIds.X];
if ((f != null) && f.HasValue)
{
longitude = f.GetDouble(_position.Coordinate.Longitude);
}
f = (NmeaField)message.Fields[GGA.FieldIds.Y];
if ((f != null) && f.HasValue)
{
latitude = f.GetDouble(_position.Coordinate.Latitude);
}
f = (NmeaField)message.Fields[GGA.FieldIds.Utc];
if ((f != null) && f.HasValue)
{
position.Time = f.GetTime(position.Time);
}
f = (NmeaField)message.Fields[GGA.FieldIds.Satelites];
if ((f != null) && f.HasValue)
{
position.Satelites = f.GetInt(position.Satelites);
}
f = (NmeaField)message.Fields[GGA.FieldIds.Hdop];
if ((f != null) && f.HasValue)
{
position.Hdop = f.GetInt(position.Hdop);
}
_position.Coordinate = new GeoCoordinate((float)latitude, (float)longitude);
}
