[vtkusers] VtkIdList and SetArray, allocation error

[foufara]

Hi All,

First, thank you Kitware for VTK ! It is really great ! A real pleasure to
use it in my everyday work.

I'm using vtk 7.1.0 with Python bindings on a Mac with Sierra (OS 10.12). 

Since quite recently (VTK 7.0 ?), vtkIdList has a new method SetArray which
should allow us to link it to an numpy array.
I suppose that this should enable us to create large vtkIdList more
efficiently than when using InsertNextId or another similar method (like
when using numpy_support for vtkDataArrays)

So I tried something like this :

a=np.arange(10)
l=vtk.vtkIdList()
l.SetArray(a,len(a))
print l.GetNumberOfIds()
for i in range(l.GetNumberOfIds()):
    print i,l.GetId(i)

It seems to work fine, but when I quit python, I get en error message saying 

"Python(13731,0x7fff9714b3c0) malloc: *** error for object 0x7fe9611a4c80:
pointer being freed was not allocated"

And I really don't know how to prevent this.
I tried to call the Allocate or the SetNumberOfIds methods first. But this
does not change anything.

Besides, the error does not occur everytime.

Can you help me on that ? Try that code on another OS (several times) ?

Thank you for your help !

Raphaël





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