[Insight-users] AnalyzeImageIO interfering with custom ImageIO class

Fri, 2 May 2003 16:12:32 -0400

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Hi,

=20

I've registered a couple of ImageIO classes that I've written with the
object factory, and am seeing a problem when the ImageFileReader =
attempts to
instantiate the correct one based on the given filename. The first of =
the
ImageIO's I've registered correctly returns false from CanReadFile(), =
and
then the next ImageIO that is checked is AnalyzeImageIO.
AnalyzeImageIO::CanReadFile() always strips off the file extension and
appends a .hdr to the filename, so if I passed myfile.fm, it changes it =
to
myfile.hdr. It then attempts to open 'myfile.hdr', which does not exist
since it's not an Analyze file to begin with, so the open fails, and the
method then throws an itk::ExceptionObject. So in effect, the second =
ImageIO
class I've registered, which will correctly handle the image, is never =
asked
if it can read the file, and the file cannot be loaded. Shouldn't this
method just return false if the file cannot be opened, so that other
ImageIO's can be queried? I also cannot just manually set the ImageIO of =
the
ImageFileReader, since I don't know the filetype in advance. Is this a =
bug,
or am I doing something wrong?

=20

Best regards,

-Parag

=20

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<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Hi,</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

I&#8217;ve registered a couple of ImageIO classes =
that I&#8217;ve
written with the object factory, and am seeing a problem when the
ImageFileReader attempts to instantiate the correct one based on the =
given
filename. The first of the ImageIO&#8217;s I&#8217;ve registered =
correctly
returns false from CanReadFile(), and then the next ImageIO that is =
checked is
AnalyzeImageIO. AnalyzeImageIO::CanReadFile() always strips off the file
extension and appends a .hdr to the filename, so if I passed myfile.fm, =
it changes
it to myfile.hdr. It then attempts to open &#8216;myfile.hdr&#8217;, =
which does
not exist since it&#8217;s not an Analyze file to begin with, so the =
open
fails, and the method then throws an itk::ExceptionObject. So in effect, =
the
second ImageIO class I&#8217;ve registered, which will correctly handle =
the
image, is never asked if it can read the file, and the file cannot be =
loaded.
Shouldn&#8217;t this method just return false if the file cannot be =
opened, so
that other ImageIO&#8217;s can be queried? I also cannot just manually =
set the
ImageIO of the ImageFileReader, since I don&#8217;t know the filetype in
advance. Is this a bug, or am I doing something wrong?

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Best regards,</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>-Parag</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

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