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

Tue Apr 1 08:55:34 EDT 2014

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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