[CMake] Subclass of external library: unresolved external symbol

[Jakob van Bethlehem]

Hej,

Seems to me at first sight you didn’t implement the New() function

Greetsz, Jakob

> On 01 Sep 2015, at 22:02, Marcos <fotosentido at gmail.com> wrote:
> 
> Hi,
> 
> I can use and include VTK libraries in my project, but I did a vtkInteractorStyleImage subclass, just overriding a method:
> 
> 
> #ifndef dcmInteractorStyleImage_h
> #define dcmInteractorStyleImage_h
> 
> #include "vtkInteractionStyleModule.h" // For export macro
> #include "vtkInteractorStyleImage.h"
> 
> class VTKINTERACTIONSTYLE_EXPORT dcmInteractorStyle : public vtkInteractorStyleImage
> {
> public:
>   static dcmInteractorStyle *New();
>   vtkTypeMacro(dcmInteractorStyle, vtkInteractorStyleImage);
> 
>   virtual void OnLeftButtonDown();
> 
>   void PrintSelf(ostream& os, vtkIndent indent);
> };
> 
> 
> #endif
> ----------------------------------------------------------------
> 
> The thing is I use it in a Qt class. So I include this in my CMakeLists.txt:
> 
> set(GENERIC_VIEW_CPP
>      View/UI/dcminteractorstyle.cpp
> )
> 
> SET(GENERIC_VIEW_H
>      View/UI/dcminteractorstyle.h
> )
> 
> add_library(generic ${GENERIC_VIEW_CPP} ${GENERIC_VIEW_H})
> ...
> add_library(ui_qt ${UI_QT_CXX}
>      ${UI_FORM_HEADERS} ${UI_RESOURCES_RCC}
>      ${MODEL_WRAPPED_HEADERS}
>      ${GENERIC_VIEW_CPP} ${GENERIC_VIEW_H} #necesary here?
> )
> qt5_use_modules(ui_qt Core Gui Widgets)
> ...
> set_source_files_properties(${UI_RESOURCES_RCC} PROPERTIES GENERATED ON)
> add_executable(UtilidadDICOM WIN32 main.cpp ${UI_RESOURCES_RCC})
> target_link_libraries(UtilidadDICOM
>     model
>     ui_qt
>     generic
>     ${Glue}
>     ${VTK_LIBRARIES}
>     ${ITK_LIBRARIES}
> )
> ------------------------------------------------------------------
> The error trying to compile:
> ui_qt.lib(viewerwidget.cpp.obj):-1: error: LNK2019: unresolved external symbol "public: static class dcmInteractorStyle * __cdecl dcmInteractorStyle::New(void)" (?New at dcmInteractorStyle@@SAPAV1 at XZ) referenced in function "public: static class vtkSmartPointer<class dcmInteractorStyle> __cdecl vtkSmartPointer<class dcmInteractorStyle>::New(void)" (?New@?$vtkSmartPointer at VdcmInteractorStyle@@@@SA?AV1 at XZ)
> 
> ui_qt is a library declared in CMake, as you can see above.
> 
> Any ideas? Thank you.
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