[Insight-users] Using ImportFilter and PasteImageFilter

[Quent]

Hi Todd,
Thanks for your answer.
You're right, I increment the pointer in order to fill it but just after the
"for" loop, I decrement it in order to be back at the beginning of the
pointer. Do you think it is still wrong ?
Thanks,
Quentin

Todd Jensen wrote:
> 
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> 
> 
> 
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> ________________________________
> From: "insight-users-request at itk.org" <insight-users-request at itk.org>
> To: insight-users at itk.org
> Sent: Thu, May 6, 2010 4:50:57 AM
> Subject: Insight-users Digest, Vol 73, Issue 19
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> Today's Topics:
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>    1. Re: Using ImportFilter and PasteImageFilter (Quent)
>    2. Re: Wrapping ITK in OSX 10.6 (Lassi Paavolainen)
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> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Thu, 6 May 2010 00:30:13 -0700 (PDT)
> From: Quent <quentin.bezsilko at gmail.com>
> Subject: Re: [Insight-users] Using ImportFilter and PasteImageFilter
> To: insight-users at itk.org
> Message-ID: <28470202.post at talk.nabble.com>
> Content-Type: text/plain; charset=UTF-8
> 
> In the following lines:
> -------------------------
>    unsigned long i, x;
>     float * fImage;
>     pixList = 
> [new2DViewer pixList];
>     for(i=0;i<[pixList count]; i++){
>         curPix = [pixList objectAtIndex:i];
>         x = height * width;
>         fImage = [curPix fImage];
>         while(x>0){
>             
> *localBuffer = *fImage;
>             localBuffer++;
>             
> cptLocalBuffer++;
>             fImage++;
>             x--;
>     
>     }
>     }
> -----------------------
> 
> you are incrementing the pointer to your allocated buffer (localBuffer++).
> So, when you use it later in:
> 
> -----------------------
> importFilter->SetImportPointer(localBuffer, numberOfPixels, true);
> -----------------------
> 
> It is no longer pointing to the memory space you allocated but just beyond
> that leading to your unexpected crash. You should rewrite you pixel copy
> code to something like:
> 
> -------------------------
>    unsigned long i, x;
>    x = height * width;
>     float * fImage;
>     float* tmpLocalBufferPtr;
>     tmpLocalBufferPtr = localBuffer;
>     pixList = 
> [new2DViewer pixList];
>     for(i=0;i<[pixList count]; i++){
>         memcpy( tmpLocalBufferPtr, [curPix fImage], x);
>         tmpLocalBufferPtr += x;
>     }
> -----------------------
> 
> Todd Jensen
> 
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