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

[Jim Miller]

Is there a way at build time whether we could whether an executable does not have any imageio factories linked in?

Jim

> On Apr 1, 2014, at 1:52 PM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
> 
> 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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> 
> 
> 
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