[vtkusers] Problem with python wrapping

[Armin Wehrfritz]

Hi David,

Indeed I saw from the VTK source tree that the wrapping is pretty 
straight forward using the higher level vtk macros.
I also stumbled across this github repo:
https://github.com/patmarion/PythonWrappedPluginExample
Especially the CMakeLists.txt in Module/Filters looks promising!

Unfortunately I don't have the time right now to look deeper into this, 
but maybe it's of help for somebody else.

When I find time for this again, I will post my experience here on the list.

-Armin




On 03/27/2015 06:05 PM, David Gobbi wrote:
> Hi Armin,
>
> Wrapping classes within the VTK source tree itself is pretty trivial.
> Someone should write some cmake macros to make it equally
> trivial for users to wrap their own classes (I'd do it myself, but I've
> already got way too many projects on my plate).
>
>   - David
>
> On Fri, Mar 27, 2015 at 9:37 AM, Armin Wehrfritz <dkxls23 at gmail.com
> <mailto:dkxls23 at gmail.com>> wrote:
>
>     Thanks a lot for for your help David!
>
>     I added some of the missing statements in a quick-and-dirty trial
>     and eventually got rid of the real_initvtkMyFilterPython symbol error.
>
>     However, I immediately ran into a new symbol error. So I'm still
>     missing some linking targets...
>
>     I will have a closer look at how it's done in VTK-dicom and see if I
>     can figure out what I'm missing.
>
>     I should probably also mention that these were my first steps
>     compiling a VTK filter and I could be missing some things on that
>     end. So far I always used boost for my C++/python coding directly.
>
>     Initially I hope the python wrapping in VTK would be as easy as with
>     boost, but there really seems to be much more CMAKE code required
>     than I thought.
>
>     -Armin
>
>
>
>
>
>
>     On 03/26/2015 06:44 PM, David Gobbi wrote:
>
>         On Thu, Mar 26, 2015 at 10:07 AM, David Gobbi
>         <david.gobbi at gmail.com <mailto:david.gobbi at gmail.com>
>         <mailto:david.gobbi at gmail.com <mailto:david.gobbi at gmail.com>>__>
>         wrote:
>
>
>
>              On Thu, Mar 26, 2015 at 9:57 AM, David Gobbi
>         <david.gobbi at gmail.com <mailto:david.gobbi at gmail.com>
>              <mailto:david.gobbi at gmail.com
>         <mailto:david.gobbi at gmail.com>>__> wrote:
>
>                  On Thu, Mar 26, 2015 at 9:25 AM, Armin Wehrfritz
>                  <dkxls23 at gmail.com <mailto:dkxls23 at gmail.com>
>         <mailto:dkxls23 at gmail.com <mailto:dkxls23 at gmail.com>>> wrote:
>
>
>                          ImportError: ./vtkMyFilterPython.so: :
>                          real_initvtkMyFilterPython
>
>
>                  The undefined symbol error probably means that your python
>                  module doesn't include vtkMyFilterPythonInit.cxx, which
>         is one
>                  of the files generated by vtk_wrap_python3().
>
>                  Your cmake should include the Init.cxx as a source file
>         when it
>                  builds the module, e.g.:
>
>                  add_library(vtkMyFilterPython MODULE
>         vtkMyFilterPythonInit.cxx)
>
>                  Or, if that still doesn't fix the problem, then there
>         might be
>                  an error in your add_library call for vtkMyFilterPythonD.
>
>
>              Oh, and the following lines are also necessary, but only if you
>              build a static library:
>
>              set_target_properties(__vtkMyFilter PROPERTIES
>              POSITION_INDEPENDENT_CODE ON)
>              set_target_properties(__vtkMyFilterPythonD PROPERTIES
>              POSITION_INDEPENDENT_CODE ON)
>
>
>         I forgot the the line that is probably the most likely to fix the
>         real_initvtkMyFilterPython symbol error:
>
>             target_link_libraries(__vtkMyFilterPython vtkMyFilterPythonD)
>
>         In summary, a lot of cmake code is needed to get stuff wrapped.
>
>            - David
>
>
>
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