Hello:
I have been using Garmin GPS 18x USB device to track location with in a WPF application using the System.Device.Location.GeoCoordinateWatcher object.
For the last couple of weeks PositionChanged and StatusChanged events stopped firing recently. Nothing I do make the events fire. They do not fire even when I move the GPS.
I am using Windows 7. When I look at the GeoCoordinateWatcher status it says "NoData" and all the values for the GeoCoordinateWatcher.Position is "NaN".
Any help is greatly appreciated.
Here is the code which I am using to track the GPS position.
void _map_Loaded(object sender, RoutedEventArgs e)
{
System.Device.Location.
GeoCoordinateWatcher geowatcher = new System.Device.Location.GeoCoordinateWatcher(GeoPositionAccuracy.High);
geowatcher.PositionChanged +=
new System.EventHandler<GeoPositionChangedEventArgs<System.Device.Location.GeoCoordinate>>(geowatcher_PositionChanged);
geowatcher.StatusChanged +=
new EventHandler<GeoPositionStatusChangedEventArgs>(geowatcher_StatusChanged);
geowatcher.Start();
}
void geowatcher_StatusChanged(object sender, GeoPositionStatusChangedEventArgs e)
{
if (e.Status == GeoPositionStatus.Ready)
{
}
string statuschange = e.Status.ToString();
}
void geowatcher_PositionChanged(object sender, GeoPositionChangedEventArgs<GeoCoordinate> e)
{
GraphicsLayer gps = this._map.Layers["gpsLayer"] as GraphicsLayer;
if (gps == null) //First Time. Create layer
{
gps =
new GraphicsLayer() { ID = "GPSLYR" };
_map.Layers.Add(gps);
Graphic g = new Graphic() { Symbol = new SimpleMarkerSymbol() };
gps.Graphics.Add(g);
}
var coord = e.Position.Location;
//The course value must be between 0.0 and 360.0, and Double.NaN if the heading is not defined.
double course = e.Position.Location.Course;
MapPoint p = new MapPoint(coord.Longitude, coord.Latitude);
txtLat.Text = coord.Latitude.ToString();
txtLong.Text = coord.Longitude.ToString();
txtCourse.Text = course.ToString();
// Project point to Map???s spatial reference, use ESRI.ArcGIS.Client.Projection.WebMercator or Geometry Service
ESRI.ArcGIS.Client.Projection.
WebMercator mercator = new ESRI.ArcGIS.Client.Projection.WebMercator();
MapPoint geogCenterPoint = null;
geogCenterPoint = mercator.ToGeographic(p)
as MapPoint;
gps.Graphics[0].Geometry = geogCenterPoint;
}
Thank you,
Sirisha.
