[vtkusers] loading string field data

[David Lonie]

For VTK arrays, GetSize() is analogous to std::vector::capacity() -- ie. it
returns the size of the allocated memory buffer, not the number of elements
in the array (confusing, I know :( ).

Use GetNumberOfTuples() + GetNumberOfComponents(), or GetNumberOfValues()
for the actual number of elements in the array.

Cheers,
Dave

On Mon, Oct 3, 2016 at 4:43 PM, Eszter Fehér <fehereszter at gmail.com> wrote:

> Dear Users,
>
> I have a problem with string field data loading from ascii vtk files in
> c++. The file content is loaded to a vtkPolyData object from which I try to
> get the array of the string field data using the following:
>
> vtkSmartPointer<vtkStringArray> array = vtkStringArray::
> vtkSafeDownCast(polydata->GetFieldData()->GetAbstractArray("strname",i));
>
> The field data in the vtk file is like:
> FIELD FieldData 1
> strname 1 4 string
> a
> b
> c
> d
>
> The problem is that the size of "array" (array->GetSize()) in the case
> above is 7 and all the elements 4..7 are empty and cause segfault if I try
> to read them.
> The size of the array depends on the actual number of string values but it
> is really confusing:
> actual size array->GetSize()
> 1 1
> 2 3
> 3 3
> 4 7
> 5 7
> 6 7
> 7 7
> 8 15
> 9 15What am I doing wrong?
> I use vtk7.0.0.
>
> Any help would be much appreciated.
>
> Regards, Eszter
>
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