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AccessViolationException in OnRender

Posted By Stuart Jones 5 Months Ago
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Stuart Jones
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Hi,We have automated UI tests that test some controls that contain charts. Sometimes they fail with an AccessViolationException. The render surface is set to Bitmap.We're not able to reproduce this but I thought the stack trace might give you a clue as to what's going on.Best regards,Stuart
Video Controller In Use: Microsoft Corporation: GDI GenericInstalled Video Controller(s): Intel(R) HD Graphics 630
Exception:System.AccessViolationExceptionMessage:Attempted to read or write protected memory. This is often an indication that other memory is corrupt.Source:Nevron.GraphicsGLStack Trace:at Nevron.GraphicsGL.l1IlllII1l.glDrawElements(Int32 mode, Int32 count, Int32 type, Void* indices) at Nevron.GraphicsGL.l1Ill111II.RenderIndexed() at Nevron.GraphicsGL.l1Illl1I1I.RenderBorderOnTwoStages(l1lI1lIlI primitive, Array vertices) at Nevron.Chart.NCartesianAxis.lII1lIIIl1(NChartRenderingContext3D context, NAxisConstLine l1l1IIl1l11, lIlI111lII& l1l1IIlIlll) at Nevron.Chart.NCartesianAxis.lII1lII11I(NChartRenderingContext3D context) at Nevron.Chart.NAxisCollection.lII1lII11I(NChartRenderingContext3D context) at Nevron.Chart.NCartesianChart.lIIlIl11ll(NChartRenderingContext3D context) at Nevron.Chart.lIl1I1IIlI.Render(NChartRenderingContext3D context, NCartesianChart chart) at Nevron.Chart.lIl1I1IIll.lII11IIII1(NChartRenderingContext3D context, NCartesianChart chart, lIlI1IlIll l1l1IIllI1l) at Nevron.Chart.lIl1I1IIll.Render(NChartRenderingContext3D context, NCartesianChart chart) at Nevron.Chart.lIl1I1IIll.lII11IIII1(NChartRenderingContext3D context, NCartesianChart chart, lIlI1IlIll l1l1IIllI1l) at Nevron.Chart.lIl1I1IIll.Render(NChartRenderingContext3D context, NCartesianChart chart) at Nevron.Chart.lIl1I1IIll.lII11IIII1(NChartRenderingContext3D context, NCartesianChart chart, lIlI1IlIll l1l1IIllI1l) at Nevron.Chart.lIl1I1IIll.Render(NChartRenderingContext3D context, NCartesianChart chart) at Nevron.Chart.NCartesianChart.lI1I1IlI1l(NChartRenderingContext3D context) at Nevron.Chart.NChart.PreOrderPaint3D(NChartRenderingContext3D context) at Nevron.Chart.NCartesianChart.PreOrderPaint3D(NChartRenderingContext3D context) at Nevron.Chart.NContentPanel.RenderInternal(NChartRenderingContext context) at Nevron.Chart.NPanel.RenderInternal(NChartRenderingContext context) at Nevron.Chart.NContentPanel.RenderInternal(NChartRenderingContext context) at Nevron.Chart.NRootPanel.RenderInternal(NChartRenderingContext context) at Nevron.Chart.Ndocument.Paint(NChartRenderingContext context, Boolean l1l1I1II11I, Boolean recalc) at Nevron.Chart.Wpf.NWpfGLBitmapRenderSurface.Paint(DrawingContext context, NWpfChartControlView view) at Nevron.Chart.Wpf.NChartControl.OnRender(DrawingContext drawingContext) at System.Windows.UIElement.Arrange(Rect finalRect)


Nevron Support
Posted 5 Months Ago
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Hi Stuart, 

Can you send us the chart state when the control fails to render for review to support@nevron.com. The code to save the control state is:

nChartControl1.Serializer.SaveControlStateToFile("c:\\temp\\chartstate.xml", Nevron.Serialization.PersistencyFormat.CustomXML, null);

This is a very popular video board so it should be easy to spot the problem if we can reproduce it.

Best Regards,
Nevron Support Team



Stuart Jones
Posted 5 Months Ago
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Hi,

I've subclassed NChartControl, overridden OnRender and wrapped base.OnRender in a try/catch. I needed to add the attribute [HandleProcessCorruptedStateExceptions] to be able to catch access violation exceptions.

In the catch I saved the chart state. It doesn't seem to contain much information, although maybe it points towards the problem:
<Root>
<Object typeId="0" name="Root" />
<IdTypeTable>
  <KeyValuePair Key="0" Value="Nevron.Chart.Wpf.NChartControlState" />
</IdTypeTable>
</Root>Thanks for looking into this,Best regards,Stuart




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