[Insight-users] Problem using ITK + VTK + QT (QVTKWidget)

[Dirk Boye]

Hello guys,

I got a problem using ITKtoVTK Image Filter together with QVTKWidget in QT.
Here's my code:

---------------------------------

          typedef itk::Image<unsigned short,2>            ImageType;
          typedef itk::ImageFileReader<ImageType>         ReaderType;
          typedef itk::ImageToVTKImageFilter<ImageType>   ConnectorType;

          ReaderType::Pointer reader = ReaderType::New();
          ConnectorType::Pointer connector = ConnectorType::New();

          std::string filename = ui.lineEdit_file->text().toStdString();
          vtkDICOMImageReader *reader2=vtkDICOMImageReader::New();

          reader->SetFileName( filename.c_str() );
          connector->SetInput( reader->GetOutput() );

          reader2->SetFileName( filename.c_str() );


          vtkImageData* vtkimage = vtkImageData::New();
          vtkimage=reader2->GetOutput();   // Uses VTK Classes to read
DICOM file
//Problem vtkimage=connector->GetOutput();  // Uses ITK -> VTK Filter

          vtkImageViewer* viewer = vtkImageViewer::New();
          viewer->SetInput( vtkimage );
          ui.qvtkWidget->SetRenderWindow(viewer->GetRenderWindow());
          viewer->SetupInteractor(ui.qvtkWidget->GetRenderWindow()->GetInteractor());
          viewer->Render();
          viewer->SetColorWindow( 254 );
          viewer->SetColorLevel( 128 );

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In this example I use "vtkimage=reader2->GetOutput()".
"reader2" is using vtkDICOMImageReader. That works just fine. I can
adjust contrast etc. by using my mouse in the QVTKWidget.

When i change that "vtkimage=..." to "vtkmage=connector->GetOutput()"
I get an Segmentation Fault as soon as i click on my button to load
the DICOM file.

Any suggestions? I really don't understand why I get that segmentation
fault. Both "connector->GetOutput()" and "reader2->GetOutput()" give a
vtkImageData.

Somebody had a similar problem here:
http://marc.info/?l=vtkusers&m=121225544421713&w=2
But overriding all mouse event handlers didn't work for me.

Thanks for your help!

Greetings from sunny Villigen (Switzerland)
Dirk Boye