[ITK] ITK IO Plugin only loads after calling itk::ObjectFactoryBase::ReHash()

[Silvio Bauer]

Hi,

I'm working on an IO plugin for ITK to read and write in-house image file
formats. I did everything as described in the wiki
here<http://www.itk.org/Wiki/Plugin_IO_mechanisms>
.

I did everything by the book, put the dynamic library in the
ITK_AUTOLOAD_PATH and set the ITK_AUTOLOAD_PATH environment variable.

The library builds successfully, but when I try to read a file with the
in-house format (with ImageReadExportVTK from the examples), I get this
error message:

ExceptionObject: Command not found.

itk::ImageFileReaderException (0x7feab10f4eb8)Location: "virtual void
itk::ImageFileReader<itk::Image<unsigned char, 3>,
itk::DefaultConvertPixelTraits<unsigned char>
>::GenerateOutputInformation() [TOutputImage = itk::Image<unsigned
char, 3>, ConvertPixelTraits = itk::DefaultConvertPixelTraits<unsigned
char>]" File: /people/seidel/ITK
src/InsightToolkit-4.2.1/Modules/IO/ImageBase/include/itkImageFileReader.hxxLine:
143Description:  Could not create IO object for file little.lat
Tried to create one of the following:
JPEGImageIOGDCMImageIOBMPImageIOLSMImageIOPNGImageIOTIFFImageIOVTKImageIOStimulateImageIOBioRadImageIOMetaImageIONiftiImageIONrrdImageIOGiplImageIO
HDF5ImageIOYou probably failed to set a file suffix, orset the suffix
to an unsupported type

However, if I put

itk::ObjectFactoryBase::ReHash();

before the reader is instantiated, everything works fine. But after that,
no default factories are loaded. As I understand the plugin mechanism
correctly, calling ReHash() shouldn't be necessary.

Can anybody point me in the right direction?

I'm on Mac OS 10.8.5 with ITK 4.2.1.

Thanks in advance.

-Silvio
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