[Insight-users] Wrapping a custom C++ function in Python

[Gaëtan Lehmann]

Le 9 juin 09 à 11:44, Julien Lamy a écrit :

> Gaëtan Lehmann a écrit :
>> Le 8 juin 09 à 15:12, Julien Lamy a écrit :
>>>
>>> I'm trying to wrap a simple C++ function in Python using WrapITK,  
>>> but the Python script fails with the following traceback :
>>> TypeError: in method 'test_wrapper', argument 1 of type  
>>> 'itk::Image< unsigned short,3 > *'
>>>
>>> My C++ function is :
>>>
>>>   bool test_wrapper(itk::Image<unsigned short, 3>::Pointer input)
>>>   {
>>>       std::cout << input->GetRequestedRegion().GetSize() <<  
>>> std::endl;
>>>   }
>>>
>>> My Python script is :
>>>   import numpy
>>>   import itk
>>>   from Wrapper import test_wrapper
>>>
>>>   data = numpy.arange(3*5*7, dtype=numpy.uint16).reshape((3,5,7))
>>>   image_itk = itk.PyBuffer[itk.Image[itk.US,  
>>> 3]].GetImageFromArray(data)
>>>   test_wrapper(image_itk)
>>>
>>> My SWIG wrapper is :
>>>
>>>   %module Wrapper
>>>   %{
>>>   #include "test_Wrapper.hpp"
>>>   %}
>>>
>>>   bool test_wrapper(itk::Image<unsigned short, 3> * input);
>> this last line should be
>>  bool test_wrapper(itkImageUS3 * input);
>> and you have to #include Base.includes (located at /usr/local/lib/ 
>> InsightToolkit/WrapITK/Configuration/Typedefs/Base.includes on my  
>> system), to %include wrap_itkImage.i (/usr/local/lib/InsightToolkit/ 
>> WrapITK/Configuration/Typedefs/wrap_itkImage.i).
>
> I'm missing both files. There is actually no trace of a WrapITK/ 
> Configuration/Typedefs directory on my system, either in the source,  
> build or installation directories. I compiled ITK 3.14.0 from source  
> with the following cmake command :
> cmake -D BUILD_EXAMPLES=OFF -D BUILD_SHARED_LIBS=ON -D  
> BUILD_TESTING=OFF \
>      -D CMAKE_BUILD_TYPE=Release \
>      -D CMAKE_INSTALL_PREFIX=MY_LOCAL_DIR \
>      -D ITK_USE_REVIEW=ON \
>      -D USE_WRAP_ITK=ON \
>      -D PY_SITE_PACKAGES_PATH=MY_LOCAL_DIR/lib/python2.5/site- 
> packages \
>      -D WRAP_ITK_JAVA=OFF -D WRAP_ITK_TCL=OFF \
>      ../InsightToolkit-3.14.0
>

Sorry, my mistake.
I thought you were using wrapitk from google code, because you have  
listed swig in your programs, but I realize that you are using it only  
for your own project.
You can't do that with wrapitk shipped with itk. I think the only way  
to go is to use an external project.


> I looked through the CMake options, but I found nothing related to  
> wrapping and typedefs. I'll give a try to the packages listed on  
> your code.google.com page and see if I can come up with something.
>

Let me know if you found any problem.

Gaëtan

>> I'm not sure, because that's a function and wrapitk currently only  
>> wrap classes, but it may be easier to do that with a wrapitk  
>> external project.
>
> This is going to be complicated for our specific project. But I'll  
> create a small external WrapITK project and look at the generated  
> Makefiles.
>
> Thanks,
> -- 
> Julien

-- 
Gaëtan Lehmann
Biologie du Développement et de la Reproduction
INRA de Jouy-en-Josas (France)
tel: +33 1 34 65 29 66    fax: 01 34 65 29 09
http://voxel.jouy.inra.fr  http://www.itk.org
http://www.mandriva.org  http://www.bepo.fr

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