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

[Williams, Norman K]

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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Notice: This UI Health Care e-mail (including attachments) is covered by the Electronic Communications Privacy Act, 18 U.S.C. 2510-2521, is confidential and may be legally privileged.  If you are not the intended recipient, you are hereby notified that any retention, dissemination, distribution, or copying of this communication is strictly prohibited.  Please reply to the sender that you have received the message in error, then delete it.  Thank you.
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