[Insight-developers] itkVTKImageIO testing question

[Gabe Hart]

Hi Brad,

As one of my first projects after joining Kitware, I've been working on 
importing the tests for itkMRCImageIO and itkVTKImageIO.  In doing so, 
I've run across an issue that Luis and I are confused on and wanted your 
input.  Following the format of your original test, my test for 
itkVTKImageIO uses a templated class to execute write and read tests for 
all supported pixel types (and ensured that IO fails on some of the 
unsupported ones).

The test (itkVTKImageIO2Test) executes nicely on my machine (Ubuntu 
10.04 x64), but is failing in the continuous builds on BillsLaptop 
(Win32 bcc5.5).  In particular, it fails to successfully read an image 
whose pixel type is itk::Vector<double,3> when reading in binary mode.  
I think it would also fail for a pixel type of double too.  The failure 
seems to be coming from line 452 where an exception is thrown saying 
"Unknown component size".  When adding a print statement to look at the 
size variable for the switch, it seems that indeed size = 8.  This would 
explain the success on my machine (64-bit) but the failure on 
BillsLaptop (32-bit).

The question this then raises is whether this is the correct behavior 
for this situation.  The switch statement seems to only consider 
different sizes of ints and does not seem to handle the options for 
floats or doubles.  In the present state, it seems to confuse a double 
with a 64 bit integer and thus is unable to read it on a 32 bit 
machine.  Is this something that should be fixed, or is there something 
tricky going on behind the scenes?

Thanks for your help,
-Gabe