[Insight-users] QUestion on iterator need help please

[Joshua Cates]

Hi Marcellus,

Are you using an ITK release or the latest CVS?  Previously there was an 
inconsistency in some of the iterator classes regarding how "End" was 
defined that will cause a possible crash in this code.  Latest versions of 
the iterators have corrected this.

Josh.

______________________________
 Josh Cates			
 Scientific Computing and Imaging Institute
 University of Utah
 Email: cates at sci . utah . edu
 Phone: (801) 587-7697
 URL:   http://www . sci . utah . edu/~cates


On Mon, 18 Aug 2003, marcellus walace wrote:

> 
> Ok thanks Luis,
> 
> I've got antoher problem...I'm using itk::ImageLinearIteratorWithIndex and 
> itk::ImageLinearConstIteratorWithIndex to copy regions from an image to one 
> another.
> But I've a runtime error because of this instruction
> 
> outputIt.Set( inputIt.Get() );  at the end of my code I've joined down...
> 
> when I remove it all is going on...but when I add it...it the crash...Can 
> you help me please...
> I've copy it from the user guide....ImageType has been defined as  
> itk::image<float, 3>.
> 
>   typedef itk::ImageLinearIteratorWithIndex<ImageType> IteratorType;
>   typedef itk::ImageLinearConstIteratorWithIndex<ImageType> 
> ConstIteratorType;
>   typedef itk::ImageFileReader< ImageType > ReaderType;
> 
>   //num=1;
>   //sprintf(currentName, "%s%d", pref,num);
> 
>   std::cout << "Loading File: " << pref << std::endl;
> 
>   ReaderType::Pointer unreader= ReaderType::New();
>   unreader->SetFileName(pref);
> 
>   ImageType::Pointer inputImage;
> 
>   try
>     {
>     unreader->Update();
>     }
>   catch( itk::ExceptionObject & exception )
>     {
>     std::cout << "Problems reading file format" << std::endl;
>     std::cout << exception << std::endl;
>     }
>   std::cout << "...Done Loading File" << std::endl;
> 
>   inputImage = unreader->GetOutput();
> 
> 
>   ImageType::Pointer outputImage = ImageType::New();
>   outputImage->SetRegions( inputImage->GetRequestedRegion() );
>   outputImage->CopyInformation( inputImage );
>   outputImage->Allocate();
> 
> 
> 
>   ConstIteratorType inputIt( inputImage, inputImage->GetRequestedRegion() );
>   IteratorType outputIt( outputImage, outputImage->GetRequestedRegion() );
> 
>   inputIt.SetDirection(0);
>   outputIt.SetDirection(0);
> 
> 
>   for (inputIt.GoToBegin(), outputIt.GoToBegin(); !inputIt.IsAtEnd(); 
> outputIt.NextLine(),inputIt.NextLine()){
> 
>    inputIt.GoToBeginOfLine();
>    outputIt.GoToBeginOfLine();
>    --outputIt;
> 
>    while( !inputIt.IsAtEndOfLine() ){
> 
> 	//   outputIt.Set( inputIt.Get() );
> 	   ++inputIt;
> 	   --outputIt;
> 
>    }//end of while loop
> 
>   }// end for loop
> 
> 
> }
> 
> _________________________________________________________________
> MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*. 
> http://join . msn . com/?page=features/virus
> 
> _______________________________________________
> Insight-users mailing list
> Insight-users at itk . org
> http://www . itk . org/mailman/listinfo/insight-users
>