[Insight-users] Simple question on raw file reading

[Phillip Cheng]

Hello,

I'm new to ITK and am trying to read in a simple raw image volume, but 
I'm not sure what I'm doing wrong.  I'm running the current ITK CVS on 
Mac OS X 10.2.4.  Here's a sample:

====================================================

#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkRawImageIO.h"

int main()
{
     typedef itk::Image<float,3> ImageType;

     typedef itk::ImageFileReader<ImageType> ReaderType;
     ReaderType::Pointer reader=ReaderType::New();

     typedef itk::RawImageIO<float,3> ImageIOType;
     ImageIOType::Pointer rawImageIO=ImageIOType::New();

     reader->SetImageIO(rawImageIO);
     reader->SetFileName("pet.img");

     rawImageIO->SetByteOrderToBigEndian();
     rawImageIO->SetFileTypeToBinary();
     rawImageIO->SetFileDimensionality(3);

     rawImageIO->SetOrigin(0,0.0);
     rawImageIO->SetOrigin(1,0.0);
     rawImageIO->SetOrigin(2,0.0);

     rawImageIO->SetDimensions(0,128);
     rawImageIO->SetDimensions(1,128);
     rawImageIO->SetDimensions(2,36);

     rawImageIO->SetSpacing(0,4.3);
     rawImageIO->SetSpacing(1,4.3);
     rawImageIO->SetSpacing(2,4.25);

     try
     {
	reader->Update();
     }
     catch(itk::ExceptionObject& err)
     {
	std::cout << "Error: "<< err << std::endl;
     }
}
============================================

When I run this, I get the following message:

Error:
itk::ExceptionObject (0x1c6230)
Location: "Unknown"
File: /Users/pmcheng/ITK/Insight/Code/IO/itkRawImageIO.txx
Line: 190
Description: itk::ERROR: RawImageIO(0x1c4070): Read failed: Wanted 
2359296 bytes, but read 2359296 bytes.


I'm not sure what this error means.  The file "pet.img" that I'm trying 
to load is exactly 2359296 bytes and is a big-endian 128x128x36 
floating point array.

Thanks for any help.

Phillip Cheng