[ITK-dev] Missing IO factories when building without cmake

[Bill Lorensen]

I was just trying to reduce the number of times this question comes up
on the users list.

I'll abandon the patch.

On Tue, Apr 1, 2014 at 5:55 AM, Miller, James V (GE Global Research)
<millerjv at ge.com> wrote:
> I think Brad has the right theme here.
>
> The issue is not a "user error". It is not a runtime error caused by user not doing something correctly.  For instance, it is not like the user forgot to give a filename an extension and therefore we couldn't figure out what format to use to write a file.
>
> Rather, the issue is a "build error".  The developer created an executable that has no means to use the ITK IO factories.
>
> So it would be good to catch this at compile time rather than runtime.
>
> Jim
>
>
>
> -----Original Message-----
> From: Insight-developers [mailto:insight-developers-bounces at itk.org] On Behalf Of Bradley Lowekamp
> Sent: Tuesday, April 01, 2014 8:39 AM
> To: Bill Lorensen
> Cc: Insight Developers
> Subject: Re: [ITK-dev] Missing IO factories when building without cmake
>
> Bill,
>
> I think including code in an exception message is a mistake. This information is clearly geared to some one developing an ITK program.
>
> I think it would be better to have a wiki page or a FAQ entry with what needs to be done to fix when there are no ImageIO factories registered. Then is exception message can just refer to that.
>
> Also there is the case when a developer using CMake did not correctly include the ITK_USE_FILE, we were getting a of those issues with ITK v4.0 first came out.
>
> Additionally, the user would have to register all the ImageIO, and TransformIO files. I have previously recommend copying the itkImageIOFactoryRegisterManager.h and the itkTransformIOFactoryRegisterManager.h files form the ITK build directory into the project to perform the factory registration.
>
> So my question, I thought some of the information was already in the WIKI some place? Anyone know where? Also the FAQ[1]  looks unmaintained. Is this not a useful resource the community should help keep up to date? Is there a better location for this type of information?
>
> Brad
>
> [1] http://www.itk.org/Wiki/ITK/FAQ
>
> On Mar 31, 2014, at 7:32 PM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
>
>> Folks,
>>
>> We have recently seen a couple of users who build their ITK apps
>> without cmake. When they try to read or write images they get a
>> message like this:
>> Description:  Could not create IO object for file foo.png  Tried to
>> create one of the following:
>>  You probably failed to set a file suffix, or
>>    set the suffix to an unsupported type.
>>
>> I submitted a gerrit patch:
>> http://review.source.kitware.com/#/c/14909/
>>
>> to provide a better description of the exception:
>>
>> Description:  Could not create IO object for writing file foo.img
>> Tried to create one of the following:
>>  There are no registered IO factories. You probably built your project
>> without using cmake  You can register the IO factories you need with:
>>    #include "itkXXXImageIOFactory.h"
>>    itk::XXXImageIOFactory::RegisterOneFactory();
>>     where XXX is e.g. Nifti, PNG, Meta...
>>       #include "itkNiftImageIOFactory.h"
>>       itk::NiftiImageIOFactory::RegisterOneFactory();
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>
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>
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