[Insight-users] Link-problems with my own itk-filter

[Luis Ibanez]

Hi Corinne,

1) About the ITK namespace
    You don't need to put your new filter in the 'itk' namespace.
    You can do it if you will, but it is not a requisite.
    The compiler errors that you are getting when you don't put
    your filter in the ITK namespace are probably due to the use
    of ITK types, like Image<>, ImageRegion, Size... etc.  If your
    filter is inside the itk namespace you are allowed to refer to
    ITK types without having to add the itk:: namespace scope, but
    when your filter is not in the itk namespace then you must preceed
    any ITK type with the itk:: namespace specification.

    Of course it will be easier for us to tell if you post the
    error compiler messages   :-)


2) The link errors for the constructor indicates that you are not
    defining the constructor, just declaring it.  You can do something
    as simple as

    protected:
      myFilter()  {}   // constructor
     ~myFilter()  {}   // destructor


    but again,
     it will be easier to help you if you post the
     header file of your filter.



Regards,


    Luis


---------------------------
Corinne Mattmann wrote:

> Hi,
> 
> I want to create my own itk-filter but I have some problems making it
> work!
> I use Microsoft Visual C++ and I include the files (my txx- and h-file
> from the filter and a testfile where I create an instance of my filter)
> in my project with CMake:
> ADD_EXECUTABLE(TestDeformableRegistrationFilter
> TestDeformableRegistrationFilter.cxx
> 		DeformableRegistrationFilter.txx
> DeformableRegistrationFilter.h)
> My filter is inherited from the ImageToImageFilter:
>   	template < class TInputImage1, class TInputImage2, class
> TOutputImage >
>   	class ITK_EXPORT DeformableRegistrationFilter : public
> ImageToImageFilter<TInputImage1,TOutputImage> 
> and I put everything in the "namespace itk".
> 
> Now my problems:
> 
> - If I compile my test-project (TestDeformableRegistrationFilter) it
> doesn't report me any errors in my filter-files. But if I take out the
> "namespace itk" I get compile errors. Why does my compiler not work
> properly if I use "namespace itk"?
> 
> - The second problem is that (independent of using the namespace itk or
> not) after compiling without errors, my project doesn't link. I guess it
> can't find my protected Constructor (I use public: itkNewMacro(Self) in
> my h-file). What am I doing wrong?
> Here's the error I get:
> Linking...
>    Creating library
> D:\packwin\vtkMy\bin\bin\Debug/TestDeformableRegistrationFilter.lib and
> object
> D:\packwin\vtkMy\bin\bin\Debug/TestDeformableRegistrationFilter.exp
> TestDeformableRegistrationFilter.obj : error LNK2001: unresolved
> external symbol "protected: __thiscall
> itk::DeformableRegistrationFilter<class itk::Image<char,3>,class
> itk::Image<char,3>,class itk::Image<class itk::Vector<float,3>,3>
> 
>>::DeformableRegistrationFilter<class itk::Image<char,3>,class
> 
> itk::Image<char,3>,class itk::Image<class itk::Vector<float,3>,3>
> 
>>(void)"
> 
> (??0?$DeformableRegistrationFilter at V?$Image at D$02 at itk@@V12 at V?$Image at V?$Ve
> ctor at M$02 at itk@@$02 at 2@@itk@@IAE at XZ)
> D:\packwin\vtkMy\bin\bin\Debug/TestDeformableRegistrationFilter.exe :
> fatal error LNK1120: 1 unresolved externals
> Error executing link.exe.
> 
> Can anybody help me?
> Thanks very much,
> Corinne Mattmann
> 
> 
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