[Paraview] problem configuring the output of a filter

[Natalie Happenhofer]

OK, as far as I understand the problem is that my inPtr and outPtr -arrays are on the stack and I nead it on the heap.
ahm.. how do I malloc or new the memory in this case? I thought that my call to SetArray does automatically allocate the necessary memory for my new_scalars array..
thx,
NH

> Date: Fri, 19 Sep 2008 08:59:19 -0400
> From: burlen.loring at kitware.com
> To: nataliehapp at hotmail.com
> CC: paraview at paraview.org
> Subject: Re: [Paraview] problem configuring the output of a filter
> 
> Natalie Happenhofer wrote:
> > Hi!
> > I have problems configuring the output of my filter, the filter is a 
> > subclass of vtkDataSetToStructuredGrid and setting the output looks as 
> > following:
> >
> > //setting the new point data
> > vtkSmartPointer<vtkFloatArray> new_scalars = 
> > vtkSmartPointer<vtkFloatArray>::New();
> >
> > double inPtr[numOfTuples + 1]; //pointer for casting the values 
> > actually to double, so I can perform arithmetic operations with them
> >  float outPtr[numOfTuples + 1];
> > //calculating ..
> >
> > new_scalars -> SetArray(outPtr,numOfTuples,1);
> 
> You are passing a stack based array here, when your function returns 
> inPtr and outPtr no longer are valid. If you are going to use SetArray 
> you'll have to malloc or new the memory you need.
> 
> >
> >
> >
> > output -> SetDimensions(dims);
> >     output -> SetPoints(pts); //Now the points are set
> >     output -> GetPointData() -> SetScalars(new_scalars);
> >     output -> Squeeze();
> >
> >
> > dims are the dimensions of the input, which is a RectilinearGrid or a 
> > StructuredGrid, new_scalars is a vtkFloatArray. I believe that the 
> > "output->GetPointData() ->SetScalars(new_scalars)"-line is causing the 
> > problem, because I get the following error messages:
> >
> > Program received signal SIGSEGV, Segmentation fault.
> > vtkFieldData::GetActualMemorySize
> > at C:/ParaviewSource/ParaView3/VTK/Filtering/vtkFieldData.cxx:577
> > size +=this->Data[i]->GetActualMemorySize();
> >
> > Backtracing, functions in vtkPVDataInformation and vtkSelfConnections 
> > are called,
> > so I guess, this does not actually happen in my source code but in the 
> > rendering pipeline. As I did not change anything in the rendering 
> > pipeline, there must be an allocation or a call in my code with 
> > incorrect arguments, but I do not really know where to look for the 
> > error.
> > Does anyone have an idea?
> >
> > Thx,
> > NH
> >
> >
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> 
> 
> -- 
> Burlen Loring
> Kitware, Inc.
> R&D Engineer
> 28 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-371-3971 x137
> 

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