[ITK-users] (R wrapping/SimpleITK) AddCommand to ImageRegistrationMethod bug

[Richard Beare]

I have had the registration example working,  but have't experimented with
the filter progress version. Will have a try.

On Sun, Apr 10, 2016 at 11:46 PM, Mathew Guilfoyle <mrguilfoyle at gmail.com>
wrote:

> Richard
>
> Thanks for the reply.  I hadn't appreciated that function being passed in
> the registration example was a closure.  However, in the
> FiterProgressReporting example it is not a closure.
>
> I have modified my code to be a closure but still get a crash/abort; I
> have also run the code in the examples themselves verbatim and get the same
> problem.
>
> Any further ideas on how to get this working?
>
> Cheers
>
>
> > On 10 Apr 2016, at 02:10, Mathew Guilfoyle <mrguilfoyle at gmail.com>
> wrote:
> >
> > There seems to be a problem with using the $AddCommand function to
> ImageRegistrationMethod objects in the R wrapping to SimpleITK.
> >
> > Using R 3.2.4 on OS X 10.11
> >
> > Example:
> >
> > f <- function(x){print(x$GetMetricValue())}
> >
> > registration = ImageRegistrationMethod()
> >
> > registration$AddCommand(‘sitkIterationEvent’, f(registration))
> >
> > This last line causes R to abort/hard crash (no error message).  This
> behaviour is irrespective of which event type I use or the function passed
> as the second argument (e.g. even something simple like print(‘Hello’))
> >
> > The AddCommand method is inherited from the SimpleITK ProcessObject
> type.  Digging around in the SimpleITK.R file I can see that the
> ProcessObject$AddCommand method expects a second argument of type
> ‘_p_itk__simple__Command’.
> >
> > There is a ‘Command’ method that generates a new object of type
> ‘_p_itk__simple__Command’.  If I pass this resulting object as the second
> argument to registration$AddCommand then I do not get an error.  However,
> there doesn’t seem to be any way to point the ‘_p_itk__simple__Command’
> object to my function or otherwise convert my function to a
> ‘_p_itk__simple__Command’ type.
> >
> > The $AddCommand method is used in a couple of example scripts on the
> SimpleITK site (using it for monitoring a registration and a filter e.g.
> https://github.com/SimpleITK/SimpleITK/blob/master/Examples/FilterProgressReporting.R)
> so I don’t know if it was working previously and a bug has been introduced
> more recently? (the example scripts cause the same error when I run them
> now)
> >
> >
> >
>
>
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