[vtkusers] release memory allocated in vtk from python

[Jothybasu Selvaraj]

Won't the auto garbage collection/ memory management in python manage this?

On Mon, Jul 2, 2012 at 7:05 PM, David Gobbi <david.gobbi at gmail.com> wrote:

> A shallow copy should be sufficient:
>
> def test(filename):
>    r = vtkgdcm.vtkGDCMImageReader()
>    r.SetFileName(filename)
>    r.Update()
>    img = vtk.vtkImageData()
>    img.ShallowCopy(r.GetOutput())
>    return img
>
> Or, to be even more minimalist, copy just the pixel data and nothing else:
>
> def test(filename):
>    r = vtkgdcm.vtkGDCMImageReader()
>    r.SetFileName(filename)
>    r.Update()
>    img = vtk.vtkImageData()
>    img.CopyStructure(r.GetOutput())
>    img.GetPointData().PassData(r.GetOutput().GetPointData())
>    return img
>
>  - David
>
> On Mon, Jul 2, 2012 at 10:17 AM, Jothy <jothybasu at gmail.com> wrote:
> > I think the first one.
> >
> > Jothy
> >
> > On 02-Jul-2012, at 5:06 PM, José M. Rodriguez Bacallao <jmrbcu at gmail.com>
> wrote:
> >
> >> hi folks, how to correctly release memory using vtk from python
> >> for example, which one of this three code snnipets release the memory
> >> allocated when reading the file:
> >>
> >> def test(filename):
> >>    r = vtkgdcm.vtkGDCMImageReader()
> >>    r.SetFileName(filename)
> >>    r.Update()
> >>    img = vtk.vtkImageData()
> >>    img.DeepCopy(r.GetOutput())
> >>    return img
> >>
> --------------------------------------------------------------------------
> >> def test(filename):
> >>    r = vtkgdcm.vtkGDCMImageReader()
> >>    r.SetFileName(filename)
> >>    r.Update()
> >>    return r.GetOutput()
> >>
> ---------------------------------------------------------------------------
> >> r = vtkgdcm.vtkGDCMImageReader()
> >> r.SetFileName(filename)
> >> r.Update()
> >> img = r.GetOutput()
> >> img = None
> >> del img
> >> r = None
> >> del r
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-- 
Jothybasu Selvaraj
PhD Student
University of Liverpool
UK
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