[Insight-users] How to transfer Itk parameters to sub-function?

[Dženan Zukić]

typedef must come before its use, that is before function. You should make
it just after all the includes.
 typedef itk::ImageFileReader<T_Image> T_Reader;

On Sat, Oct 27, 2012 at 6:48 PM, flydps <flydps at 163.com> wrote:

> **
> Hi, friends!
> I am trying to write sub function with Itk. But I am puzzled by how to get
> the Itk typedef parameters for the sub-function. The function I want to
> realize is as follow, but how can I transfer the information of  "pReader"
> to my sub-function "OutputOldImageWidth"?
>
>
>
>
>
> #include "itkImage.h"
> #include "itkImageFileReader.h"
> #include "itkImageFileWriter.h"
>
> #include <iostream>
> //Subfuntion to get image width
> void OutputOldImageWidth(T_Reader::Pointer pReader);
>
> void OutputOldImageWidth(T_Reader::Pointer pReader)
> {
>   const T_Image::RegionType& inputRegion =
>
>                               pReader->GetOutput()->GetLargestPossibleRegion();
>   const T_Image::SizeType& vnInputSize = inputRegion.GetSize();
>   unsigned int nOldWidth = vnInputSize[0];
>   unsigned int nOldHeight = vnInputSize[1];
>   printf("\nThe old width of image is %d",nOldWidth);
>  }
> /////////////////////////////////////
>
> int main( int argc, char * argv[] )
> {
>   if( argc != 3 )
>   {
>     std::cerr << "Usage: "
>               << std::endl
>               << argv[0]
>               << " inputImageFile outputImageFile "
>               << std::endl;
>
>     return EXIT_FAILURE;
>   }
>
>   // Typedef's for pixel, image, reader and writer types
>   typedef unsigned char T_InputPixel;
>   typedef unsigned char T_OutputPixel;
>
>   typedef itk::Image<T_InputPixel, 2> T_Image;
>   typedef itk::ImageFileReader<T_Image> T_Reader;
>   typedef unsigned char T_WritePixel;
>   typedef itk::Image<T_WritePixel, 2> T_WriteImage;
>   typedef itk::ImageFileWriter<T_WriteImage> T_Writer;
>
>
>
>   // Prepare the reader and update it right away to know the sizes beforehand.
>
>   T_Reader::Pointer pReader = T_Reader::New();
>   pReader->SetFileName( argv[1] );
>   pReader->Update();
>
>
>   //****************** Call subfunction to get the image width.
>  OutputOldImageWidth(T_Reader::Pointer pReader)
>
>
>   // Write the result
>   T_Writer::Pointer pWriter = T_Writer::New();
>   pWriter->SetFileName(argv[2]);
>   pWriter->SetInput(pReader->GetOutput());
>   pWriter->Update();
>
>   return EXIT_SUCCESS;
> }
>
> Thank you!
>
> flydps
>
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