GeoCoordinateWatcher does not fire PositionChanged/StatusChanged events

sirishapolsapalli — Tue, 20 Nov 2012 19:39:16 GMT

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.

Re: GeoCoordinateWatcher does not fire PositionChanged/StatusChanged events

Kylie — Wed, 21 Nov 2012 15:49:36 GMT

Hi Sirisha --

This forum is for the application that Esri has that is on Windows Phone devices. You will probably want to post this question in the WPF forum: http://forums.arcgis.com/forums/131-ArcGIS-Runtime-SDK-for-WPF

Thanks!

topic GeoCoordinateWatcher does not fire PositionChanged/StatusChanged events in ArcGIS Runtime SDK for WPF (Retired) Questions

GeoCoordinateWatcher does not fire PositionChanged/StatusChanged events

Re: GeoCoordinateWatcher does not fire PositionChanged/StatusChanged events