[Insight-users] Questions about Getting Started with ITK+VTK

[Luis Ibanez]

Hi Jeffrey,

There is definitely something
special about your "D" drive.     :-)

Maybe you forgot to mention something
like:

  - It is a drive shared from another machine ?
  - It has different access permissions ?

This doesn't seems to be a problem related
to ITK at all. It is very likely that the following
plain C++ code will also fail in your machine:

---------------------------------------------
#include <iostream>

int main()
{
   std::ifstream file;
   file.open("D:\\circle.png");
   if( file.fail() )
     {
     std::cerr << "Impossible to open file" << std::endl;
     return -1;
     }
   std::cout << "File can be open " << std::endl;
   file.close();
   return 0;
}
------------------------------



Regards


    Luis


-----------------
Jeffrey Li wrote:

> Dear Luis,
>  
> I've solved the problem but it seemed wield to me. I copied the file to 
> the C drive, and modified the code to "C:Circle.png", it worked! I saw 
> that picture. And I tried "C:\Circle.png", the warning message showed 
> out, but it also worked fine. I even tried to copy the file to an 
> external hard disc (F drive), and everything was fine with both 
> "F:Circle.png" and "F:\Circle.png". It really looks wield to me. Seems 
> there are some problems with my D drive. I installed the itk and vtk on 
> the D drive, will it be the problem?
>  
> Thanks a lot!
>  
> Sincerely,
>  
> Jeff
> 
> */Luis Ibanez <luis.ibanez at kitware.com>/* wrote:
> 
> 
>     Hi Jeffrey,
> 
>     The error message seems to be clear enough,
>     your program is not finding the input image
>     file "./circle.png". Therefore it cannot
>     feed the rest of the pipeline.
> 
>     When the ImageFileReader can't locate a file,
>     it throws and ITK exception, that is then
>     converted to a Python exception (thanks to
>     Charl Botha who took the time of making this
>     connection).
> 
> 
>     So the problem is related to the line:
> 
>      > reader->SetFileName( "D:circle.png");
> 
>     meaning that this filename doesn't seems
>     to be valid. You probably want to try
>     "D:\circle.png" if the file is actually
>     in the root directory of the "D:" drive.
> 
> 
> 
>     Regards,
> 
> 
> 
>     Luis
> 
> 
>     ------------------
>     Jeffrey Li wrote:
> 
>      > Dear all,
>      >
>      > I'm a beginner of ITK and VTK. I got a problem when I ran the
>     example named< BR>> " Getting Started Two", the "Getting Started
>     with ITK+VTK". The compilation
>      > was alright, but the program crashed in run time. The error message's
>      > "Couldn't open file ./circle.png". I tried to debug it. When I
>     commented
>      > out the sentence "viewer->SetInput( connector->GetOutput() );",
>     it worked
>      > fine, and a small black window came out. Did anyone meet the same
>     problem?
>      > Is the sample correct?
>      >
>      > P.S. My working environment is .Net 2003
>      >
>      > Thanks a lot!
>      >
>      > Attached is the code
>      >
>      > #include "itkImage.h"
>      > #include "itkImageFileReader.h"
>      > #include "itkImageToVTKImageFilter.h"
>      > #include "itkImageFileWriter.h"
>      >
>      > #include "vtkImageViewer.h"
>      > #include "vtkRenderWindowInteractor.h"
>      >
>      > int main( int argc, char **argv ) {
>      >
>      > typedef itk::Image ImageType;
>      > typedef itk::ImageFileReader ReaderType;
>      > typedef itk::ImageToVTKImageFilter ConnectorType;
>      > typedef itk::ImageFileWriter WriterType;
>      >
>      > ReaderType::Pointer reader = ReaderType::New();
>      > ConnectorType::Pointer connector = ConnectorType::New();
>      > WriterType::Pointer writer = WriterType::New();
>      >
>      > reader->SetFileName( "D:circle.png");
>      > connector->SetInput( reader->GetOutput() );
>      >
>      > vtkImageViewer * viewer = vtkImageViewer::New();
>      >
>      > vtkRenderWindowInteractor * renderWindowInteractor =
>      > vtkRenderWindowInteractor::New();
>      >
>      > viewer->SetInput( connector->GetOutput() );
>      >
>      > viewer->SetColorWindow( 255 );
>      > viewer->SetColorLevel( 128 );
>      > viewer->SetupInteractor( renderWindowInteractor );
>      >
>      > viewer->Render();
>      > renderWindowInteractor->Start();
>      >
>      > return 0;
>      > }
>      >
>      > J. Li
>      >
>      >
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