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MapView Application crashes when click on MapTools Center

#1

Hi again

when clicking on the center of the new MapTool the hole application crashes.
Only one PostgresFeatureLayer is loaded.

System.InvalidCastException
HResult=0x80004002
Nachricht = Das Objekt des Typs “System.DBNull” kann nicht in Typ “System.Byte[]” umgewandelt werden.
Quelle = ThinkGeo.PostgreSql
Stapelüberwachung:
at ThinkGeo.Core.PostgreSqlFeatureSource.NEk=()
at ThinkGeo.Core.PostgreSqlFeatureSource.GetBoundingBoxCore()
at ThinkGeo.Core.FeatureSource.GetBoundingBox()
at ThinkGeo.Core.LayerOverlay.GetBoundingBoxCore()
at ThinkGeo.Core.PanZoomBarMapTool.70k=(Object sender, MouseButtonEventArgs e)
at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
at System.Windows.Input.InputManager.ProcessStagingArea()
at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
at gisMEWinFormsClient.My.MyApplication.Main(String[] Args) in :line 81

Do not know what to do…

Normal zoom functions working well. Also the move North/West/East/South of MapTool.
Doubleclick the Map also zoom ok.

Regards
Hardy

#2

Thanks Hartwig,
The center of the new MapTool supposed to zoom to the extent which could contain all features in overlays. I did some test. It works fine.Here is my code.

 // It is important to set the map unit first to either feet, meters or decimal degrees.   
            map.MapUnit = GeographyUnit.Meter;

            // Create a new overlay that will hold our new layer and add it to the map.   
            LayerOverlay coyoteSightingsOverlay = new LayerOverlay();
            map.Overlays.Add(coyoteSightingsOverlay);

            // Create the new layer and set the projection as the data is in srid 2276 as our background is srid 3857 (spherical mercator).   
            PostgreSqlFeatureLayer coyoteSightingsLayer = new PostgreSqlFeatureLayer("User ID=thinkgeo_user;Password=cs%^%#trsdFG;Host=sampledatabases.thinkgeo.com;Port=5432;Database=thinkgeo_samples;Pooling=true;", "frisco_coyote_sightings", "id", 2276);
            coyoteSightingsLayer.FeatureSource.ProjectionConverter = new ProjectionConverter(2276, 3857);

            // Add the layer to the overlay we created earlier.   
            coyoteSightingsOverlay.Layers.Add("Coyote Sightings", coyoteSightingsLayer);

            // Set a point style to zoom level 1 and then apply it to all zoom levels up to 20.   
            coyoteSightingsLayer.ZoomLevelSet.ZoomLevel01.DefaultPointStyle = new PointStyle(PointSymbolType.Circle, 12, GeoBrushes.Red, new GeoPen(GeoColors.White, 2));
            coyoteSightingsLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;

            // Set the map view current extent to a bounding box that shows just a few sightings.     
            map.CurrentExtent = new RectangleShape(-10784283.099060204, 3918532.598821122, -10781699.527518518, 3916820.409397046);

            // Refresh the map.   
            map.Refresh();

Could you provide part of your code to help me re-produce this error.

Thanks

Frank

#3

Hi Frank,

a part from our code is difficult because it’s about 1000+ lines.
But your way to add a postgres layer is like my.
We are using epsg 25832 for projection.

I think the function to zoom the full extent is a bit dangerous. Our Maps contains many Overlays with several layers und thousands of features. Zooming the extent may take minutes…

Am I able to configure the tool?
To enable/disable zooming the extent…

What we discovered in V12 is that there are issues with patterns and PointStyles with Images.
At the moment we test a lot and I will keep you informed which Styles (Area, Point etc.) is breaking.

Maybe there is a dependency between Styles and Extents.

Regards
Hardy

#4

Thanks Hartwig,
You can use map.MapTools.PanZoomBar.GlobeButtonVisibility = System.Windows.Visibility.Hidden; to hide the center button.

Thanks

Frank

#5

Hi Frank,

that’s working.

Regards
Hardy

#6

Thanks Hartwig,
Good to know it works. Go ahead let us know if you have any more questions.

Thanks

Frank