[Paraview] Segmentation Fault when using the vtkPVDReader

[Sebastien Jourdain]

Hi Bogdan,

here are some issue in your code:

vtkSmartPointer <vtkPVDReader> pReader = vtkPVDReader::New(); // <== Memory
LEAK
// Should be either
// vtkNew<vtkPVDReader> pReader;
// vtkSmartPointer<vtkPVDReader> pReader =
vtkSmartPointer<vtkPVDReader>::New()

Then here on a "NULL" object you try to call a method.

vtkMultiBlockDataSet* pMultiBlockDataSet->DeepCopy(vtkMultiBlockDataSet::
SafeDownCast(pReader->GetOutputDataObject(0)));

Should be something like that:

vtkNew< vtkMultiBlockDataSet > pMultiBlockDataSet;
pMultiBlockDataSet->DeepCopy(vtkMultiBlockDataSet::SafeDownCast(pReader->
GetOutputDataObject(0)));

Then you might have some other issue where pReader output being empty/null,
but for that I don't know.

Are you managing your project with CMake? Did you include the necessary
file with the proper dependency declaration. This seems to be related to
the factory not being properly initialized. You can search the mailing
list, Marcus did answer several questions about that.

Seb



On Thu, Oct 23, 2014 at 7:26 AM, Bogdan Daqui Herrera <bdaqui at simscale.de>
wrote:

> Hello all,
>
> I am attempting to write some code in c++ which uses the vtkPVDReader from
> the paraview library to read a series of vtm files. However I am
> encountering some
> problems and I am not sure whether there is something I am missing or
> whether this could be a bug.
>
> I am trying to use the reader in the following manner:
> My Code:
>         vtkSmartPointer <vtkPVDReader> pReader = vtkPVDReader::New();
>         pReader->SetForceOutputTypeToMultiBlock(1);
>         pReader->SetFileName("/some/fileName.pvd");
>         pReader->Update();
>         vtkMultiBlockDataSet*
> pMultiBlockDataSet->DeepCopy(vtkMultiBlockDataSet::SafeDownCast(pReader->GetOutputDataObject(0)));
>
> Error:
>         The error occurs at Update() with the following result:
>         ERROR: In
> /misc/dn47/SALOME/PRODUCTS/7x/opt/Ubuntu.13.10.64/7.4.0/tmp/ParaView-4.1.0_SRC/ParaViewCore/VTKExtensions/Default
>         /vtkXMLCollectionReader.cxx, line 316
>         vtkPVDReader (0x224d9e0): Error creating
> "vtkXMLMultiBlockDataReader" using vtkPVInstantiator.
>         Segmentation fault
>
> Possible error Source
> The code concerning line 316 from vtkXMLCollectionReader.cxx is:
>
>       // Use the instantiator to create the reader.
>       vtkObject* o = vtkPVInstantiator::CreateInstance(rname);
>       vtkXMLReader* reader = vtkXMLReader::SafeDownCast(o);
>       this->Internal->Readers[index] = reader;
>       if(reader)
>         {
>         reader->Delete();
>         }
>       else
>         {
>         // The class was not registered with the instantiator.
>         vtkErrorMacro("Error creating \"" << rname
>                       << "\" using vtkPVInstantiator.");
>         if(o)
>           {
>           o->Delete();
>           }
>         }
>       }
>
> I have isolated the following lines and tested them independently:
>       vtkObject* o = vtkPVInstantiator::CreateInstance(rname);
>       vtkXMLReader* reader = vtkXMLReader::SafeDownCast(o);
>
> The pointer "vtkObject* o" is NULL regardless of the class name I pass to
> instantiate, and I can imagine something like that happening in the
> library, too and
> causing the segmentation fault, when calling a SafeDownCast(o) (which is
> NULL).
>
>
> Any suggestions on how to deal with this problem or if you would be so
> kind to point me to an example for an alternative solution (Could be
> vtkFileSeriesReader,
> but this fails, as well in my case) would be appreciated.
>
> Kind Regards,
> Bogdan
>
> P.S.: Using the PVDReader from python code works flawlessly, which is also
> quite confusing, as to why it would fail in the C++ code.
>
> --
> Bogdan Daqui
> Software Development
>
> SimScale GmbH
> Lichtenbergstraße 8
> 85748 Garching bei München
>
> Phone: +49 (0)89 3398 4078
> Email: bdaqui at simscale.de
>
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>
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