[vtkusers] About DICOM loading with VTK, ITK and QT

[Luis Ibanez]

Hi Xiaopeng,

It is likely that the source of the error is that
you are instantiating ITK objects inside your
constructor, but not associating them to
member variables of the "SimpleView" class.

Therefore, these ITK objects will be destroyed
by the time you get to the closing bracket of
your class constructor (the end of scope).


The typical solution here,
is that you should make:

  ReaderType::Pointer reader;

  FilterType::Pointer connector;


to be member variables of your class (move them to

declaration of the SimpleView class in your header file)

and instantiate them in the constructor as


  this->reader = ReaderType::New();

  this->connector = FilterType::New();


In this way, they will stay alive for the lifetime
of the SimpleView class.



     Regards,


          Luis


-----------------------------------------------------------------
On Tue, Jun 15, 2010 at 10:06 AM, Xiaopeng Yang <yxp233 at postech.ac.kr>wrote:

>  Dear VTK users,
>
>
>
>  I made a simple UI with QT for loading a DICOM image by ITK and visualize
> it by VTK. Even I successfully debugged the code, but when I ran the
> executable file, errors occurred: “An unhandled win32 exception occurred in
> SimpleView.exe [448]”. Could you help me to check whether there is any
> problem in my code?
>
>
>
> SimpleView::SimpleView()
>
> {
>
>   this->ui = new Ui_SimpleView;
>
> this->ui->setupUi(this);
>
>
>
> //Define ITK DICOM loader
>
>   typedef itk::Image <unsigned short, 2> ImageType;
>
>   typedef itk::ImageFileReader<ImageType>ReaderType;
>
>
>
>   //Connect ITK to VTK
>
>   typedef itk::ImageToVTKImageFilter<ImageType>FilterType;
>
>
>
>   ReaderType::Pointer reader = ReaderType::New();
>
>   FilterType::Pointer connector = FilterType::New();
>
>   reader->SetFileName("C:/Documents and Settings/edt/Desktop/QT
> Test3/ImageViewer/DICOM/portal47.dcm");
>
>   connector->SetInput(reader->GetOutput());
>
>
>
> vtkImageViewer *viewer = vtkImageViewer::New();
>
>
>
>   this->ui->qvtkWidget_2->SetRenderWindow(viewer->GetRenderWindow());
>
>   viewer->SetupInteractor(this
> ->ui->qvtkWidget_2->GetRenderWindow()->GetInteractor());
>
>   viewer->SetInput(connector->GetOutput());
>
>   viewer->Render();
>
>   viewer->SetColorLevel(255);
>
> viewer->SetColorWindow(128);
>
>
>
>   connect(this->ui->actionOpenFile, SIGNAL(triggered()), this,
> SLOT(slotOpenFile()));
>
>   connect(this->ui->actionExit, SIGNAL(triggered()), this,
> SLOT(slotExit()));
>
> };
>
>
>
>
>
> Thanks.
>
>
>
> Xiaopeng
>
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