[Insight-users] Error in compilation of WatershedImageFilter in a standalone project

[Luis Ibanez]

Hi Feng,


You are probably missing to link with the library

                  ITKAlgorithms

Note that

     itkWatershedMiniPipelineProgressCommand.cxx

is actually compiled and packaged in to that library,
(It is one of those rare ITK classes that are not templated)


Please make sure that you add this library to your
CMakeLists.txt file.


-----


It is entirely possible to wrap ITK code into C functions.

This is exactly what we did for implementing the VolView
plugins available in InsightApplications, and works fine.

As you said,
this will be a very common approach for integrating
ITK functionalities into other projects.



   Regards,


     Luis


---------------------------------------
Feng Ma wrote:
> Hi,
> 
>  I am working on a project which call ITK watershed library inside a C 
> function. To do this, I wrote a C++ wrapper which uses 
> itk::ResampleImageFilter, itk::CurvatureAnisotropicDiffusionImageFilter, 
> itk::GradientMagnitudeImageFilter and itk::WatershedImageFilter. 
> Basically the same operation as we saw in the watershed example. Then 
> the main C function will call this c++ wrapper. The wrapper is compiled 
> using c++ compiler (g++). The main function is compiled using c compiler 
> (gcc). The project is finally linked using g++. I do declare the wrapper 
> function to be extern "C" in order to be able to call from a C function.
> 
>  I use cmake to construct the project. However, I got the following 
> error during the final link stage, related to watershed image filter:
> 
> /r2net/r2/fma/ITK/lib/InsightToolkit/libITKWrapLib.a(itkWatershed3DSeg.o): 
> In function `itk::WatershedImageFilter<itk::Image<float, 3> 
>  >::WatershedImageFilter(void)':
> itkWatershed3DSeg.o(.itk::WatershedImageFilter<itk::Image<float, 3> 
>  >::gnu.linkonce.t.(void)+0x5a7): undefined reference to 
> `itk::WatershedMiniPipelineProgressCommand type_info function'
> itkWatershed3DSeg.o(.itk::WatershedImageFilter<itk::Image<float, 3> 
>  >::gnu.linkonce.t.(void)+0x5d9): undefined reference to 
> `itk::WatershedMiniPipelineProgressCommand type_info function'
> itkWatershed3DSeg.o(.itk::WatershedImageFilter<itk::Image<float, 3> 
>  >::gnu.linkonce.t.(void)+0x65b): undefined reference to 
> `itk::WatershedMiniPipelineProgressCommand virtual table'
> /r2net/r2/fma/ITK/lib/InsightToolkit/libITKWrapLib.a(itkWatershed3DSeg.o): 
> In function `itk::WatershedImageFilter<itk::Image<float, 3> 
>  >::GenerateData(void)':
> itkWatershed3DSeg.o(.itk::WatershedImageFilter<itk::Image<float, 3> 
>  >::gnu.linkonce.t.GenerateData(void)+0x1ab): undefined reference to 
> `itk::WatershedMiniPipelineProgressCommand type_info function'
> collect2: ld returned 1 exit status
> 
>   If I commented out parts related to watershed, there is no error.
> 
>   If I remove the extern "C" for the wrapper, also change the caller to 
> be a c++ file and compile the calling function using c++, I got the same 
> error.
> 
>   If I build the same application inside InsightApplication tree, 
> without using wrappers, I don't have any error.
> 
>  Any thoughts on this? I am thinking my situation may be a common 
> situation for some users. We want to call ITK functions from some legacy 
> code which is c-compatible. To use ITK library, one easy way is to write 
> a c wrapper.
> 
>  If needed, I will post my code here. I am using CVS version of ITK. I 
> could not remember the exact date I checked out, but should be after 1.2 
> release. My "cvs status" shows:
> ===================================================================
> File: itkWatershedMiniPipelineProgressCommand.cxx       Status: Needs Patch
> 
>   Working revision:    1.2
>   Repository revision: 1.3     
> /cvsroot/Insight/Insight/Code/Algorithms/itkWatershedMiniPipelineProgressCommand.cxx,v 
> 
>   Sticky Tag:          (none)
>   Sticky Date:         (none)
>   Sticky Options:      (none)
> 
>  Is this a known problem and fixed in cvs already?
> 
>  Thanks a lot.
> 
> -Feng
> 
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