[Insight-developers] file reader behavior

[Damion Shelton]

Quick question about image IO:

Until recently, the following code fragment worked fine.

  m_ImageReader = ImageFileReaderType::New();
  itk::MetaImageIOFactory::RegisterOneFactory();
  m_ImageReader->SetFileName( m_InputImageFilename );
  m_InputImage = m_ImageReader->GetOutput();
  m_InputImage->SetRequestedRegionToLargestPossibleRegion();
  m_ImageReader->Update();

Now, this crashes, but rewriting it in a slightly different way works.

  m_ImageReader = ImageFileReaderType::New();
  itk::MetaImageIO::Pointer metaIO;
  metaIO = itk::MetaImageIO::New();
  m_ImageReader->SetImageIO(metaIO);
  m_ImageReader->SetFileName(m_InputImageFilename);
  m_ImageReader->Update();
  m_InputImage = m_ImageReader->GetOutput();
  m_InputImage->SetRequestedRegionToLargestPossibleRegion();

Any ideas what's going on? The original code was very similar to 
MetaImageIOTest while the new version is closer to most of the other image 
tests (PNG, for instance). Which of the two styles (factory vs. SetImageIO) 
is "correct"?

Thanks,
-Damion-