[vtkusers] Auto-initialisation of Object Factories on Win32

[Craig Henderson]

Hi David,
I was building the 'master' branch from git. I've switched to 'release' and will rebuild. I had problems with many objects, not just vtkRenderingOpenGL. Will try the 'release' branch to see if that works.

Thanks
-- Craig

On 19 Oct 2012, at 17:12, David E DeMarle <dave.demarle at kitware.com> wrote:

> Are you using vtk development head (ie what will become 6.0)?
>  If so the problem is that your application depends on vtkRendering,
> but you haven't specified that vtkRenderingOpenGL is to be the
> implementation of that module.
> 
> From:
> http://vtk.org/Wiki/VTK/Build_System_Migration
> "
> The application code must list vtkRenderingOpenGL in its components to
> use OpenGL for rendering and include the VTK_USE_FILE to add compiler
> definitions. This ensures that the object factory for the
> vtkRenderingOpenGL module will be initialized and uses whenever
> classes from vtkRenderingCore are uses in your application code. If
> you notice the interface classes in these modules returning NULL
> pointers it is likely that one of these implementation modules
> providing appropriate overrides is missing from the dependency list.
> "
> 
> Do that by either using the first cmakelist from the Finding and
> Linking to VTK section or make sure that vtkRenderingOpenGL shows up
> in your COMPONENTS and link libraries lines in the other two.
> 
> David E DeMarle
> Kitware, Inc.
> R&D Engineer
> 21 Corporate Drive
> Clifton Park, NY 12065-8662
> Phone: 518-881-4909
> 
> 
> On Fri, Oct 19, 2012 at 11:36 AM, Craig Henderson
> <craig.henderson at intelligentultrasound.com> wrote:
>> Hi, I have been searching for a way to enable Auto-initialisation of Object
>> Factories on Windows (MSVC), but without success. Most calls to
>> Object::New() are returning null pointers and stepping through the code I
>> can see the factory is missing.
>> 
>> 
>> 
>> To prove the case, I added this block to my code, and New() worked for
>> vtkRenderingOpenGL.
>> 
>> 
>> 
>> _declspec(dllimport) void vtkRenderingOpenGL_AutoInit_Construct();
>> 
>> vtkRenderingOpenGL_AutoInit_Construct();
>> 
>> 
>> 
>> I guess there’s a simple compiler option when building VTK, but cannot find
>> it anywhere.
>> 
>> 
>> 
>> Thanks for your help
>> 
>> -- Craig
>> 
>> 
>> 
>> 
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