# Warnings

VTKExamples/Cxx/Developers/Warnings

### Code

Warnings.cxx

    #include <vtkSmartPointer.h>
    #include <vtkDataObject.h>
    #include <vtkObjectFactory.h>

    class TestClass : public vtkDataObject
    {
      public:
      static TestClass *New();
      vtkTypeRevisionMacro(TestClass,vtkDataObject);
      TestClass()
      {
        vtkWarningMacro("Test warning.");
      }
    };

    vtkStandardNewMacro(TestClass);

    int main(int, char *[])
    {

      vtkSmartPointer<TestClass> test =
          vtkSmartPointer<TestClass>::New();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(Warnings)

    find_package(VTK COMPONENTS
      vtkCommonCore
      vtkCommonDataModel QUIET)
    if (NOT VTK_FOUND)
      message("Skipping Warnings: ${VTK_NOT_FOUND_MESSAGE}")
      return ()
    endif()
    message (STATUS "VTK_VERSION: ${VTK_VERSION}")
    if (VTK_VERSION VERSION_LESS "8.90.0")
      # old system
      include(${VTK_USE_FILE})
      add_executable(Warnings MACOSX_BUNDLE Warnings.cxx )
      target_link_libraries(Warnings PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(Warnings MACOSX_BUNDLE Warnings.cxx )
      target_link_libraries(Warnings PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS Warnings
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build Warnings

Click here to download Warnings and its CMakeLists.txt file. Once the tarball Warnings.tar has been downloaded and extracted,

    cd Warnings/build

If VTK is installed:

    cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

    cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

Build the project:

    make

and run it:

    ./Warnings

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.