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<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-US">Dear VTK ActiViz users,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We are working on a x64 C# WinForm application based on Activiz 5.8.0 wrapping of VTK classes.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Since migration of our application to Framework .NET4.0 (we were previously building with .NET3.5) it appears that we experience more frequent random crashes related to the Activiz wrapping.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The crashing methods die with an AccessViolationException which generally occurs within one the 4 following methods (though we can find other less recurrent places):<o:p></o:p></span></p>
<p class="MsoListParagraphCxSpFirst" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span lang="EN-US" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">Kitware.VTK.vtkRenderWindow.vtkRenderWindow_Render_88 (usually on mouse event)<o:p></o:p></span></p>
<p class="MsoListParagraphCxSpMiddle" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span lang="EN-US" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">Kitware.VTK.vtkAlgorithm.vtkAlgorithm_UpdateWholeExtent_73 (usually on mouse event)<o:p></o:p></span></p>
<p class="MsoListParagraphCxSpMiddle" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span lang="EN-US" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">Kitware.VTK.vtkDataObject.vtkDataObject_UnRegister_120 (finalizer)<o:p></o:p></span></p>
<p class="MsoListParagraphCxSpLast" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1">
<![if !supportLists]><span lang="EN-US" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">Kitware.VTK. vtkObjectBase.vtkObjectBase_UnRegister_12 (finalizer)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I read from < </span><a href="http://vtkdotnet.sourceforge.net/Programming.html"><span lang="EN-US">http://vtkdotnet.sourceforge.net/Programming.html</span></a><span lang="EN-US">> (last paragraph) that such crashes could
be related to bad referencing or bad event un-subscription.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">If I reduce the C# code to the following one in a C# Console application, in Release x64 (x86 with pending x86 Activiz dlls crashes the same), I experience the crash randomness, principally in the GC Finalizer Thread
for method vtkDataObject_UnRegister_120, but also in the main thread at the update (vtkAlgorithm_Update_68 in this case)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas;color:blue">namespace</span><span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> VTKCrashTestApplication<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas">{<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">
using</span> System;<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">
using</span> System.Threading;<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">
using</span> Kitware.VTK;<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:green">
// to add Kitware.Activiz.dll and Kitware.mummy.Runtime.dll to your References</span><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:green">
// to add to PostBuild replacing <LibraryFolderPath> with your own path</span><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:green">
//xcopy "<LibraryFolderPath>\Activiz\5.8.0\$(PlatformName)\*.*" $(ProjectDir)$(OutDir) /i /y</span><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">
internal</span> <span style="color:blue">class</span> <span style="color:#2B91AF">
Program</span><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> {<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">
private</span> <span style="color:blue">static</span> <span style="color:blue">void</span> Main(<span style="color:blue">string</span>[] args)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> {<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:#2B91AF">
Thread</span> lGCStressThread = <span style="color:blue">new</span> <span style="color:#2B91AF">
Thread</span>(GarbageCollectorStressThread);<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> lGCStressThread.Start();<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:green">
// just a time feedback</span><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:#2B91AF">
Console</span>.WriteLine(<span style="color:blue">string</span>.Format(<span style="color:#A31515">"Start time: {0}"</span>,
<span style="color:#2B91AF">DateTime</span>.Now));<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:green">
// create the unique source instance</span><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:#2B91AF">
vtkSphereSource</span> lVtkSphereSource = <span style="color:#2B91AF">vtkSphereSource</span>.New();<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">
int</span> count = 0;<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">
while</span> (<span style="color:blue">true</span>)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> {<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:green">// update the source</span><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> lVtkSphereSource.SetRadius(1 + count%100);<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> lVtkSphereSource.Update();<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:green">
// get a volatile reference to the source output</span><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:#2B91AF">
vtkPolyData</span> lvtkPolyData = lVtkSphereSource.GetOutput();<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> count++;<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">
private</span> <span style="color:blue">static</span> <span style="color:blue">void</span> GarbageCollectorStressThread(<span style="color:blue">object</span> arg)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> {<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">
int</span> gccount = 0;<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:blue">
while</span> (<span style="color:blue">true</span>)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> {<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:#2B91AF">
GC</span>.Collect();<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:#2B91AF">
Thread</span>.Sleep(200);<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> <span style="color:#2B91AF">
GC</span>.WaitForPendingFinalizers();<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> gccount++;<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas"> }<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:0cm;margin-bottom:.0001pt;line-height:normal;text-autospace:none">
<span lang="EN-US" style="font-size:9.5pt;font-family:Consolas">}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">As we’ve tried to dig into the vtkusers mailing list, we barely read answers to the posts.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I plan to build a Debug version of the wrappers, to get a better understanding of what’s going on. As for now, I can hardly get it working for 5.8.0 (Debug x64)…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Any constructive feedback will be appreciated.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">/chris<o:p></o:p></span></p>
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