/// <summary>
/// Parses the specified NMEA message.
/// </summary>
/// <param name="message">The NMEA message string.</param>
/// <returns></returns>
/// <exception cref="System.ArgumentException">
/// Invalid nmea message: Missing starting character '$'
/// or checksum failure
/// </exception>
public static NmeaMessage Parse(string message)
{
if (string.IsNullOrEmpty(message))
{
throw new ArgumentNullException("message");
}
int checksum = -1;
if (message[0] != '$')
{
throw new ArgumentException("Invalid nmea message: Missing starting character '$'");
}
var idx = message.IndexOf('*');
if (idx >= 0)
{
checksum = Convert.ToInt32(message.Substring(idx + 1), 16);
message = message.Substring(0, message.IndexOf('*'));
}
if (checksum > -1)
{
int checksumTest = 0;
for (int i = 1; i < message.Length; i++)
{
checksumTest ^= Convert.ToByte(message[i]);
}
if (checksum != checksumTest)
{
throw new ArgumentException(string.Format(CultureInfo.InvariantCulture, "Invalid nmea message: Checksum failure. Got {0:X2}, Expected {1:X2}", checksum, checksumTest));
}
}
string[] parts = message.Split(new char[] { ',' });
string MessageType = parts[0].Substring(1);
string[] MessageParts = parts.Skip(1).ToArray();
if (messageTypes == null)
{
LoadResponseTypes();
}
NmeaMessage msg = null;
if (messageTypes.ContainsKey(MessageType))
{
msg = (NmeaMessage)messageTypes[MessageType].Invoke(new object[] { });
}
else
{
msg = new UnknownMessage();
}
msg.MessageType = MessageType;
msg.MessageParts = MessageParts;
msg.OnLoadMessage(MessageParts);
return(msg);
}
public static NmeaMessage Parse(string message)
{
int checksum = -1;
if (message[0] != '$')
throw new ArgumentException("Invalid nmea message: Missing starting character '$'");
var idx = message.IndexOf('*');
if (idx >= 0)
{
checksum = Convert.ToInt32(message.Substring(idx + 1), 16);
message = message.Substring(0, message.IndexOf('*'));
}
if (checksum > -1)
{
int checksumTest = 0;
for (int i = 1; i < message.Length; i++)
{
if (i == 0) continue;
checksumTest ^= Convert.ToByte(message[i]);
}
if (checksum != checksumTest)
throw new ArgumentException(string.Format("Invalid nmea message: Checksum failure. Got {0:X2}, Expected {1:X2}", checksum, checksumTest));
}
string[] parts = message.Split(new char[] { ',' });
string MessageType = parts[0].Substring(1);
string[] MessageParts = parts.Skip(1).ToArray();
if(messageTypes == null)
{
LoadResponseTypes();
}
NmeaMessage msg = null;
if (messageTypes.ContainsKey(MessageType))
{
msg = (NmeaMessage)messageTypes[MessageType].Invoke(new object[] { });
}
else
{
msg = new UnknownMessage();
}
msg.MessageType = MessageType;
msg.MessageParts = MessageParts;
msg.LoadMessage(MessageParts);
return msg;
}