[vtk-developers] GetOutput().GetWholeExtent()

[David Gobbi]

Adding a hint for Get(vtkInformationIntegerVectorKey *) turned out to
be straightforward.. I have a patch in gerrit that allows Get to be used
with all IntegerVector and DoubleVector keys so that WHOLE_EXTENT,
SPACING, ORIGIN, etc. can be used from the wrappers.  I'll probably
merge tomorrow.

A more general solution, i.e. one that also encompasses IntegerPointer
keys (yikes!) will have to wait...

 - david



On Wed, Mar 28, 2012 at 3:46 PM, David Gobbi <david.gobbi at gmail.com> wrote:
> You mean a generic "pointer" object that can be used from Python.
>
> In Python 3, there is a special object called "memoryview" that can be
> used for this purpose, so that's the direction that I've considered
> going.  I'd like to avoid generic pointer wrapping, because it makes
> it too easy to crash the program from python.  I know that SWIG wraps
> pointers, but I've made a conscious choice not to do the same for the
> VTK wrappers.
>
>  - David
>
>
> On Wed, Mar 28, 2012 at 3:32 PM, Pat Marion <pat.marion at kitware.com> wrote:
>> Hi David,
>>
>> What about making a generic way to access these kinds of arrays, given a
>> length argument, using ctypes or numpy?
>>
>> Something like:
>>
>> length = info.Length(key)
>> myarray = vtk.array_from_pointer(info.Get(key), length)
>>
>>
>> Pat
>>
>>
>> On Wed, Mar 28, 2012 at 4:08 PM, David Gobbi <david.gobbi at gmail.com> wrote:
>>>
>>> Hmm, I just noticed something in my own code.  The following method
>>> isn't wrapped, because it returns a bare pointer.  As a result the
>>> WHOLE_EXTENT key can't be used with Get:
>>>
>>> int * vtkInformation::Get(vtkInformationIntegerVectorKey *);
>>>
>>> But I think that I can add a wrapper hint to get it working... the
>>> wrappers can internally query the Length() method to figure out what
>>> number of values to return.
>>>
>>>  - David
>>>
>>>
>>> On Fri, Mar 23, 2012 at 10:44 AM, Philippe Pebay
>>> <philippe.pebay at kitware.com> wrote:
>>> > Thanks Bill.
>>> >
>>> > Philippe
>>> >
>>> >
>>> > On Fri, Mar 23, 2012 at 4:49 PM, Bill Lorensen <bill.lorensen at gmail.com>
>>> > wrote:
>>> >>
>>> >> This page has a suggested replacement.
>>> >> http://vtk.org/Wiki/VTK/VTK6/Migration/WikiExamples#Improve
>>> >>
>>> >> On Fri, Mar 23, 2012 at 8:23 AM, Philippe Pebay
>>> >> <philippe.pebay at kitware.com> wrote:
>>> >> > Hello all
>>> >> >
>>> >> > GetOutput().GetWholeExtent() does not work any longer in VTK 6. I
>>> >> > have q
>>> >> > boatload of vtkpython scripts using this! Does anyone know what the
>>> >> > quick
>>> >> > fix is?
>>> >> >
>>> >> > Thanks
>>> >> > Philippe
>>> _______________________________________________
>>> Powered by www.kitware.com
>>>
>>> Visit other Kitware open-source projects at
>>> http://www.kitware.com/opensource/opensource.html
>>>
>>> Follow this link to subscribe/unsubscribe:
>>> http://www.vtk.org/mailman/listinfo/vtk-developers
>>>
>>