[vtkusers] Problem with python wrapping

[Armin Wehrfritz]

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>> wrote:
>
>
>
>     On Thu, Mar 26, 2015 at 9:57 AM, David Gobbi <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>> 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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