topic Re: Envelope causes access violation crash in .NET Maps SDK Questions

Envelope causes access violation crash

MarkCederholm — Wed, 15 Oct 2014 16:14:49 GMT

I have a class for flashing geometry (attached) which worked just fine in the beta. In the release, however, the app crashes with an access violation if the geometry is an envelope. If I build a polygon from the envelope and use that instead, the error goes away. Weird, huh? Any idea why this might be happening?

Re: Envelope causes access violation crash

JenniferNery — Wed, 15 Oct 2014 23:30:40 GMT

Hi Mark,

Do you mind sharing the sample code for flashing geometry that uses Envelope? I can't seem to see attachment.

Re: Envelope causes access violation crash

MarkCederholm — Thu, 16 Oct 2014 14:26:17 GMT

I can see it on my post: clsGraphicHelper.cs.zip 1.7K

Re: Envelope causes access violation crash

JenniferNery — Thu, 16 Oct 2014 18:43:32 GMT

Sorry, I was looking from a expanded view of your post from the main landing page: ArcGIS Runtime SDK for .NET I didn't realize attachments are only visible from within the message.

Anyway, I used your helper class with this very simple sample. I commented out the workaround of replacing g with PolygonBuilder but I'm not able to reproduce the issue. It seems to work without AccessViolationException. I ran the sample against the final released version 10.2.4.748

xmlns:esri="http://schemas.esri.com/arcgis/runtime/2013">

<Grid x:Name="LayoutRoot"

Background="White">

<esri:MapView x:Name="MyMapView">

<esri:Map >

<esri:ArcGISTiledMapServiceLayer ServiceUri="http://services.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer" />

<esri:GraphicsLayer ID="MyLayer" />

</esri:Map>

</esri:MapView>

<StackPanel Orientation="Horizontal"

VerticalAlignment="Top"

HorizontalAlignment="Center">

<Button Content="Flash"

Click="Button_Click" />

</StackPanel>

</Grid

private async void Button_Click(object sender, RoutedEventArgs e)

{

string message = null;

try

{

var geometry = await MyMapView.Editor.RequestShapeAsync(DrawShape.Envelope);

var graphic = new Graphic() { Geometry = geometry, Symbol = new SimpleFillSymbol() };

var layer = MyMapView.Map.Layers["MyLayer"] as GraphicsLayer;

layer.Graphics.Add(graphic);

clsGraphicHelper.FlashGeometry(MyMapView, geometry, geometry.Extent.GetCenter());

}

catch (TaskCanceledException)

{

}

catch (Exception ex)

{

message = ex.Message;

}

if (!string.IsNullOrWhiteSpace(message))

MessageBox.Show(message);

}

Re: Envelope causes access violation crash

MarkCederholm — Fri, 17 Oct 2014 02:25:14 GMT

The problem is using FlashGeometry with an Envelope on a graphics layer with a label class:

public MainWindow()

{

InitializeComponent();

var layer = MyMapView.Map.Layers["MyLayer"] as GraphicsLayer;

TextSymbol txtSym = new TextSymbol();

AttributeLabelClass lc = new AttributeLabelClass();

lc.Symbol = new TextSymbol();

lc.TextExpression = "[SomeFieldName]";

layer.Labeling.LabelClasses.Add(lc);

layer.Labeling.IsEnabled = true;

}

private async void Button_Click(object sender, RoutedEventArgs e)

{

var geometry = await MyMapView.Editor.RequestShapeAsync(DrawShape.Rectangle);

//geometry = geometry.Extent; // Uncomment this line to make app crash

clsGraphicHelper.FlashGeometry(MyMapView, geometry, geometry.Extent.GetCenter());

}

Re: Envelope causes access violation crash

JenniferNery — Fri, 17 Oct 2014 17:41:52 GMT

Hi Mark,

Thank you. This is very helpful. I can reproduce the issue consistently even without your helper class. GraphicsLayer with labeling enabled crashes with AccessViolationException when it contains an Envelope geometry. I have logged an issue and we'll try to get it fixed in future releases.

Re: Envelope causes access violation crash

MarkCederholm — Mon, 16 Feb 2015 17:38:40 GMT

I see this is fixed at 10.2.5. Thanks.