[vtkusers] vtkDataSetWriter problem

[Amy Squillacote]

Hi Daniele,

This error means that you are calling Write() or Update() on the
vtkDataSetWriter without setting an input to it (i.e., without giving it a
dataset to write).

- Amy

On Mon, Feb 9, 2009 at 10:43 AM, Daniele Giunchi
<d.giunchi at scsolutions.it>wrote:

> Hi All,
> I've a problem with a test I performed with vtkDataSetWriter. I create a
> class that have two APIs for read or write as binary input string a
> vtkDataset (I use vtkDataSetReader and Writer inside it), and I made a
> first  test in which I call this class, and set the input in order to return
> me the string.
> The problem is that if I create an instance of vtkDataSetWriter inside my
> class, it returns me an error :
>
> vtkErrorMacro("Input for connection index " << index
>                     << " on input port index " << port
>                     << " for algorithm " << this->Algorithm->GetClassName()
>                     << "(" << this->Algorithm << ") is NULL, but a "
>                     << info->Get(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(),
> 0)
>                     << " is required.");
>
> that is in vtkDemandDrivenPipeline.cxx
> If the vtkDataSetWriter is created inside my test class, it's all ok. I
> don't understand why there is a different behaviour.
> I debug the code and I discover that the problem is here:
>
> vtkObjectBase* vtkInformation::GetAsObjectBase(vtkInformationKey* key)
>
> In this function, in the erroneous case the key array and values array are
> different from the correct case, and also the hash index
> is wrong I suppose, because in the correct case I've always the same entry
> (10) that correspond to a polydata, while in the second
> case I've 19, that doesn't correspond to anything.
>
> The version I use is vtk 5.2.1.
>
> Any advice?
> Thank you very much
> best regards,
>
> Daniele
>
>
> ----------------------------------------
> Dott. Daniele Giunchi
> Software Developer
> BioComputing Competence Centre
> Super Computing Solutions s.r.l. , CINECA
> Via Magnanelli 6/3, 40033 Casalecchio di Reno BO, Italy
> http://tinyurl.com/z24zv
> http://www.scsolutions.it
> mailto:d.giunchi at scsolutions.it
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