/// <summary>
/// Get the position reported by the GPS receiver that is no older than
/// the maxAge passed in
/// </summary>
/// <param name="maxAge">Max age of the gps position data that you want back.
/// If there is no data within the required age, null is returned.
/// if maxAge == TimeSpan.Zero, then the age of the data is ignored</param>
/// <returns>GpsPosition class with all the position details</returns>
public GpsPosition GetPosition(TimeSpan maxAge)
{
GpsPosition gpsPosition = null;
if (Opened)
{
// allocate the necessary memory on the native side. We have a class (GpsPosition) that
// has the same memory layout as its native counterpart
IntPtr ptr = Utils.LocalAlloc(Marshal.SizeOf(typeof(GpsPosition)));
// fill in the required fields
gpsPosition = new GpsPosition();
gpsPosition.dwVersion = 1;
gpsPosition.dwSize = Marshal.SizeOf(typeof(GpsPosition));
// Marshal our data to the native pointer we allocated.
Marshal.StructureToPtr(gpsPosition, ptr, false);
// call native method passing in our native buffer
int result = GPSGetPosition(gpsHandle, ptr, 500000, 0);
if (result == 0)
{
// native call succeeded, marshal native data to our managed data
gpsPosition = (GpsPosition)Marshal.PtrToStructure(ptr, typeof(GpsPosition));
if (maxAge != TimeSpan.Zero)
{
// check to see if the data is recent enough.
if (!gpsPosition.Time.HasValue || DateTime.UtcNow - maxAge > gpsPosition.Time)
{
gpsPosition = null;
}
}
}
// free our native memory
Utils.LocalFree(ptr);
}
return(gpsPosition);
}
/// <summary>
/// Get the position reported by the GPS receiver that is no older than
/// the maxAge passed in
/// </summary>
/// <param name="maxAge">Max age of the gps position data that you want back.
/// If there is no data within the required age, null is returned.
/// if maxAge == TimeSpan.Zero, then the age of the data is ignored</param>
/// <returns>GpsPosition class with all the position details</returns>
public GpsPosition GetPosition(TimeSpan maxAge)
{
GpsPosition gpsPosition = null;
if(Opened)
{
// allocate the necessary memory on the native side. We have a class (GpsPosition) that
// has the same memory layout as its native counterpart
IntPtr ptr = Utils.LocalAlloc(Marshal.SizeOf(typeof(GpsPosition)));
// fill in the required fields
gpsPosition = new GpsPosition();
gpsPosition.dwVersion = 1;
gpsPosition.dwSize = Marshal.SizeOf(typeof(GpsPosition));
// Marshal our data to the native pointer we allocated.
Marshal.StructureToPtr(gpsPosition, ptr, false);
// call native method passing in our native buffer
int result = GPSGetPosition(gpsHandle, ptr, 500000, 0);
if(result == 0)
{
// native call succeeded, marshal native data to our managed data
gpsPosition = (GpsPosition) Marshal.PtrToStructure(ptr, typeof(GpsPosition));
if(maxAge != TimeSpan.Zero)
{
// check to see if the data is recent enough.
if(!gpsPosition.Time.HasValue || DateTime.UtcNow - maxAge > gpsPosition.Time)
{
gpsPosition = null;
}
}
}
// free our native memory
Utils.LocalFree(ptr);
}
return gpsPosition;
}
void gps_LocationChanged(object sender, GpsPosition position)
{
try
{
if(position != null)
{
count++;
//Debug.WriteLine("LocationChanged: " + DateTime.Now.ToLongTimeString() + " -> " + count);
if(position.Time.HasValue && position.Latitude.HasValue && position.Longitude.HasValue)
{
//Debug.WriteLine("Location: " + position.Latitude.Value + "|" + position.Longitude.Value);
// first time
if(!TimeUTC.HasValue)
{
TimeUTC = position.Time;
Lat = position.Latitude;
Lng = position.Longitude;
}
if(TimeUTC.HasValue && position.Time - TimeUTC.Value >= delay)
{
Delta = gps.GetDistance(position.Latitude.Value, position.Longitude.Value, Lat.Value, Lng.Value);
Total += Delta;
Lat = position.Latitude;
Lng = position.Longitude;
TimeUTC = position.Time;
AddToLogCurrentInfo(position);
}
}
else
{
Lat = position.Latitude;
Lng = position.Longitude;
TimeUTC = position.Time;
}
// do not update if user is idling
if(IsVisible)
{
lock(Satellites)
{
Satellites.Clear();
Satellites.AddRange(position.GetSatellitesInView());
Satellites.TrimExcess();
}
Invoke(updateDataHandler, position);
}
}
}
catch(Exception ex)
{
Debug.WriteLine("gps_LocationChanged: " + ex);
}
}
public bool AddToLogCurrentInfo(GpsPosition data)
{
if(string.IsNullOrEmpty(LogDb))
{
return false;
}
bool ret = true;
try
{
{
if(cmd.Transaction == null)
{
cmd.Transaction = cn.BeginTransaction(IsolationLevel.Serializable);
Debug.WriteLine("BeginTransaction: " + DateTime.Now.ToLongTimeString());
}
cmd.Parameters["@p1"].Value = data.Time.Value;
cmd.Parameters["@p2"].Value = countReal++;
cmd.Parameters["@p3"].Value = Delta;
cmd.Parameters["@p4"].Value = data.Speed;
cmd.Parameters["@p5"].Value = data.SeaLevelAltitude;
cmd.Parameters["@p6"].Value = data.EllipsoidAltitude;
cmd.Parameters["@p7"].Value = (short?) data.SatellitesInViewCount;
cmd.Parameters["@p8"].Value = (short?) data.SatelliteCount;
cmd.Parameters["@p9"].Value = data.Latitude.Value;
cmd.Parameters["@p10"].Value = data.Longitude.Value;
cmd.Parameters["@p11"].Value = data.PositionDilutionOfPrecision;
cmd.Parameters["@p12"].Value = data.HorizontalDilutionOfPrecision;
cmd.Parameters["@p13"].Value = data.VerticalDilutionOfPrecision;
cmd.Parameters["@p14"].Value = (byte) data.FixQuality;
cmd.Parameters["@p15"].Value = (byte) data.FixType;
cmd.Parameters["@p16"].Value = (byte) data.FixSelection;
cmd.ExecuteNonQuery();
}
if(DateTime.Now - LastFlush >= FlushDelay)
{
TryCommitData();
}
}
catch(Exception ex)
{
Debug.WriteLine("AddToLog: " + ex.ToString());
ret = false;
}
return ret;
}
public LocationChangedEventArgs(GpsPosition position)
{
this.position = position;
}
public LocationChangedEventArgs(GpsPosition position)
{
this.position = position;
}