[Insight-developers] What triggers instantiation of all ImageIO libraries?

[Johnson, Hans J]

Kent,

For this case, explicitly registering only the handful of classes should
be just fine.
There is really no need to use the "Magic" to register them automatically.

Hans


-----Original Message-----
From: <Williams>, Kent Williams <norman-k-williams at uiowa.edu>
Date: Thursday, November 21, 2013 2:09 PM
To: Bradley Lowekamp <blowekamp at mail.nih.gov>
Cc: ITK <insight-developers at itk.org>
Subject: Re: [Insight-developers] What triggers instantiation of all
ImageIO libraries?

If I understand what you're saying in that first sentence, if I define
ITK_NO_IO_FACTOR_REGISTER_MANAGER before including ${ITK_USE_FILE} then
the factories don't get registered.

I do not do that.

It seems my ImageIO factories aren't being registered. I suspect it is
because I'm building a shared library (i.e. MEX64 file).  If you build an
executable, the C++ runtime instantiates static objects before calling
main().  The MEX64 file gets loaded as a shared object and then Matlab
calls mexFunction.


Congratulations on the cascade of clauses in that sentence. Positively
Heideggerian.

I tried including itkImageFactoryRegisterManager.h and ran into a whole
lot of undefined externals caused by referencing GDCMImageIO.  The gdcm
libraries aren't included in ITK_LIBRARIES, which is a problem for me,
since MEX is doing the linking for me, not CMake.

On 11/21/13 1:30 PM, "Bradley Lowekamp" <blowekamp at mail.nih.gov> wrote:

>Kent,
>
>If you explicitly don't use the implicit ITK auto registration by
>defining ITK_NO_IO_FACTORY_REGISTER_MANAGER to true[1], before including
>"ITK_USE_FILE" in cmake, your factories don't get registered.
>
>Look for a files called itkImageIOFactoryRegisterManager.h  and
>itkTransformIOFactoryRegisterManager.h in a directory called
>ITKIOFactoryRegistration in build trees that use ITK.
>
>These file are automatically generated based on the ITK IO modules turned
>on. Some times you can just copy that file and use it. Otherwise there is
>some funny cmake stuff will need to be done.
>
>It also may be easiest to just call
>YourImageIOFactor::RegisterOnFactory(), if you just need a couple know
>one registered.
>
>
>[1]
>https://github.com/SimpleITK/SimpleITK/blob/master/Code/BasicFilters/src/C
>MakeLists.txt#L11
>
>On Nov 21, 2013, at 1:56 PM, "Williams, Norman K"
><norman-k-williams at uiowa.edu> wrote:
>
>> I'm in the process of using ITK in a C++ MEX Matlab extension.
>>
>> I solved the linking issues, but I ran into an interesting problem:
>>When
>> the MEX extension gets called, the ImageIOFactory instances have not yet
>> been registered. Is there a function I need to call before I use
>>ImageIO?
>>
>> --
>> Kent Williams norman-k-williams at uiowa.edu
>>
>>
>>
>>
>>
>>
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