[vtkusers] Removal of vtkImageSource causing problems for vtkITKArchetypeImageSeriesReader

[Berk Geveci]

Hi Kent,

Can you share the piece of the code that is leading to this error? The
easiest thing would be to run this in a debugger and set a breakpoint
in vtkDemandDrivenPipeline.cxx:715.
It looks like someone is calling SetInputConnection() or one of the related
functions on the reader. Also, if you could post the old and the new
versions of the reader, I might have some more specific suggestions on the
conversion.

Best,
-berk



On Thu, Apr 18, 2013 at 11:44 AM, Kent Williams
<nkwmailinglists at gmail.com>wrote:

> I have spent several hours puzzling over this.
>
> There is a class vtkITKArchetypeImageSeriesReader that is part of Slicer.
>
> In the process of converting BRAINSTools to be compatible with VTK6, I ran
> into this issue: vtkImageSource is gone, and
> vtkITKArchetypeImageSeriesReader derives from it.
>
> As far as I can tell from reading the Pipeline migration guide, things
> that were once derived from vtkSource are now supposed to be derived from
> vtkAlgorithm.
>
> So I changed the superclass for vtkITKArchetypeImageSeriesReader to
> vtkImageAlgorithm.
>
> This compiles OK but at runtime it has this error message:
>
> 118: ERROR: In
> /scratch/kent/BRAINSTools/build/VTK/Common/ExecutionModel/vtkDemandDrivenPipeline.cxx,
> line 715
> 118: vtkCompositeDataPipeline (0x7f946c916190): Input port 0 of algorithm
> vtkITKArchetypeImageSeriesScalarReader(0x7f946c914990) has 0 connections
> but is not optional.
>
> Now something that is a source, doesn't need any inputs -- the input in
> this case is the name of the file or files to read to generate an image.
>
> I don't understand the VTK pipeline in general, or this problem
> specifically, and frankly I was trying to do this conversion on a 'need to
> know' basis -- only learn what I need to know in order to get the
> conversion done.
>
> So the question is -- if something was working fine before derived from
> vtkImageSource, what is the least-effort path to getting it functional in
> VTK6?
>
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