[Insight-users] Problem for reading vtk images

[Luis Ibanez]

Hi Alex,

Thanks for the additional details.
Now it makes sense.


What is the content of the VTK file that you
are not being able to read with your current code:


 >>> itk::ImageIOBase::Pointer imageIO =
 >>> itk::ImageIOFactory::CreateImageIO ( entree,
 >>> itk::ImageIOFactory::ReadMode );



You may find the answer to your problem in the CanReadFile() method
of the VTKImageIO class. Lines 124-147:



bool VTKImageIO::CanReadFile(const char* filename)
{
   std::ifstream file;
   char buffer[256];
   std::string fname(filename);

   if ( fname.find(".vtk") >= fname.length() )
     {
     return false;
     }

   if ( ! this->OpenVTKFileForReading(file, filename) )
     {
     return false;
     }

   // Check to see if its a vtk structured points file
   file.getline(buffer,255);
   file.getline(buffer,255);
   file.getline(buffer,255);
   file.getline(buffer,255);

   fname = buffer;

   if ( fname.find("STRUCTURED_POINTS") < fname.length() ||
        fname.find("structured_points") < fname.length() )
     {
     return true;
     }
   else
     {
     return false;
     }
}




This method is currently returning "false" in your case,
which means that your file is failing one (or several
of the tests above).



     Regards,



        Luis


-----------------------
Alexandre Abadie wrote:
> Hi Luis,
> 
> Thanks for the reply.
> I already had a look using ImageFileReader for opening my datas but I am 
> trying to extend my program for using 4D or 3D datas. I have to typedef 
> ImageType with the dimension (3 or 4) before opening the data when using 
> ImageFileReader (and I don't know the dimension before :-) ). With the 
> ImageIO object, there's a method called "GetNumberOfDimensions()" that 
> gives me the dimensions of the data I am trying to open. Then I develop 
> a template method for processing my data (both 3D or 4D).
> 
> My code compiles for the moment and works with 3D datas (except with vtk 
> datas in itk3.4). I didn't have a look for the moment if my program 
> works with 4D datas.
> 
> What can you advice to me ?
> 
> Thanks,
> 
> Alex
> 
> Luis Ibanez a écrit :
> 
>>
>>
>> Hi Alex,
>>
>>
>>   Why are you using the ImageIO classes directly ?
>>
>>
>>     You *should not* need to access them at all.
>>
>>
>> You can read image by simply using the ImageFileReader:
>>
>>
>>
>>   typedef itk::ImageFileReader< ImageType >   ReaderType;
>>
>>   ReaderType::Pointer  reader = ReaderType::New();
>>
>>   reader->SetFileName("myImage.vtk");
>>
>>   try
>>     {
>>     reader->Update();
>>     }
>>   catch( itk::ExceptionObject & excp )
>>     {
>>     std::cerr << excp << std::endl;
>>     return EXIT_FAILURE;
>>     }
>>
>>
>>
>>
>> The ImageFileReader will deal with the ImageIOFactories for you.
>>
>>
>>
>> Please give us more details about what you are doing,
>>
>>
>>    Thanks
>>
>>
>>
>>       Luis
>>
>>
>>
>> ----------------------
>> Alexandre Abadie wrote:
>>
>>> Hi itk users,
>>>
>>> I am currently using the itkImageIOFactory class for reading the data 
>>> formats supported by itk. This works very well with versions 3.0 and 
>>> 3.2 but I recently made an update to 3.4 and now I can't read vtk 
>>> data. I tested with NIFTI and Mha data and it always works.
>>> Here is how I am proceeding :
>>> itk::ImageIOBase::Pointer imageIO = 
>>> itk::ImageIOFactory::CreateImageIO ( entree, 
>>> itk::ImageIOFactory::ReadMode );
>>> This return a null pointer when I am trying to load a vtk data with 
>>> itk 3.4.
>>>
>>> Any suggestion ?
>>>
>>> Thanks in advance.
>>>
>>> Alex
>>> _______________________________________________
>>> Insight-users mailing list
>>> Insight-users at itk.org
>>> http://www.itk.org/mailman/listinfo/insight-users
>>>
>