[vtk-developers] SetInput fails?

[Berk Geveci]

What does filter->GetInputConnection(0, 0) return?

-berk

On Sat, May 29, 2010 at 9:31 PM, Tim Peeters <thjmpeeters at gmail.com> wrote:
> Hi all,
>
> To make it a bit more clear, I wrote a test plug-in with the following function:
>
> void VTKPipelineTestPlugin::dataSetAdded(data::DataSet* ds)
> {
>        if (ds->getKind() != "DTI") return;
>
>        vtkImageData* dti = ds->getVtkImageData();
>        Q_ASSERT(dti);
>
>        QString basename = ds->getName();
>        qDebug()<<"Dataset"<<ds<<"with name"<<basename<<"and
> kind"<<ds->getKind()<<"seems usable.";
>
>        vtkSimpleImageFilterExample* filter = vtkSimpleImageFilterExample::New();
>        qDebug()<<"setting intput to"<<dti;
>        filter->SetInput(dti);
>        qDebug()<<"input is"<<filter->GetInput();
> }
>
> when I run the software, and this function is executed, the output is
> as follows:
>
> Dataset 0x101db9ed0 with name "1" and kind "DTI" seems usable.
> setting intput to 0x11aa5a8f0
> input is 0x0
>
> What can be wrong here? Where can I look to find out why Set or
> GetInput() fails?
>
> Thanks,
> Tim.
>
> On Fri, May 28, 2010 at 20:53, Tim Peeters <thjmpeeters at gmail.com> wrote:
>> Dear developers,
>>
>> I am developing a VTK-based application that uses a plug-in system to
>> add functionality to the core system.
>> I am loading plug-ins (which are loaded as DLL's on Windows) using the
>> Qt plugin system.
>>
>> The following code, in one of the plugins, fails:
>>
>> vtkTensorToEigensystemFilter* eigen = vtkTensorToEigensystemFilter::New();
>> // dti is a valid vtkImageData object
>> eigen->SetInput(dti);
>> vtkImageData* eigenOut = eigen->GetOutput();
>> // eigenOut == NULL
>>
>>
>> vtkTensorToEigensystemFilter is a subclass of
>> vtkSimpleImageToImageFilter which basically only implements the
>> SimpleExecute() function and thus does not change the {Get,Set}Input()
>> function(s). Since eigenOut == NULL, I assume that SetInput or
>> GetOutput() fails, and I have been debugging but I get lost in the VTK
>> pipeline and I cannot trace back the error. In a different place I use
>> vtkExtractVOI in a similar way as vtkTensorToEigenSystemFilter, and I
>> get the same problem.
>>
>> dti is a vtkImageData that is constructed in a different plugin and is
>> the output of a reader. All the functions used to work in one "big"
>> application that did not use plugins, but now it fails in MSVC2008
>> express on Windows. I usually do my development on Linux (Ubuntu and
>> Slackware), and with GCC on Linux everything works fine. On Windows,
>> different parts of the pipeline are built in different dll's
>> (plugins), but the image data (dti) and its producer port seem to be
>> consistent in the plugin that creates the dti dataset and the plugin
>> that uses it.
>>
>> Does anyone have any clues how I can track where this problem comes from?
>>
>> Thanks a lot!
>> Tim.
>>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtk-developers
>
>