[Insight-users] Error using SetImportPointer

[richyvr]

This is the exact problem i am talking about. for me both of the options
doesnt seem to be working. it gives me a run time error. 

"Hi Vijay,

You must *always* assign the result of a New() operator
to a SmartPointer.  Like in:

   typedef itk::Image<unsigned char, 2>  ImageType;

   ImageType::Pointer img = ImageType::New();



When creating an ITK image inside a function you have the
following two options from preventing the image from
being destroyed at the time the function returns:



Option A:

    Create the SmartPointer of the image type outside
    the function and pass it as a pointer. Then inside
    the function assign the image to that passed Smart
    Pointer.

    If you are doing this in a C-like interface, that will
    look like



   // before calling the function
   typedef itk::Image<unsigned char, 2>  ImageType;
   ImageType::Pointer img;
   void * pimg = &img;
   myFunctionForCreatingAnImage( pimg, k1, k2, k3,... kn );




  // inside the function
   void myFunctionForCreatingAnImage( void * pimg, k1, k2 ... )
   {
   typedef itk::Image<unsigned char, 2>  ImageType;

    // your code for the importer filter..

   ImageType::Pointer *kimg = (ImageType::Pointer *)pimg;
   *kimg = importer->GetOutput();
   return;
   }






Option B:

    You can artificially increase the reference count
    of the image before returning from the function,
    and return the raw pointer to the image in the form
    of a (void *).



    // Inside the function
    void * myFunction( k1, k2,...)
    {
     typedef itk::Image<unsigned char, 2>  ImageType;
     // do the import stuff...

     importer->Update(); // IMPORTANT !!!
     ImageType::Pointer image = importer->GetOutput();

     image->Register();  // Increment the reference count

     return image.GetPointer();
    }


    // Outside the function
    ImageType::Pointer image = (ImageType *)myFunction(...);
    image->UnRegister(); // Decrement the reference count

    // start happily using the image....




Option "A" is by far a better approach...



Please let us know if you have further questions,


    Thanks


      Luis
"

option 1 runs with out issues if you create importFilter->SetImportPointer(
pImageBuffer, nPixels, 0);
but when i call it using importFilter->SetImportPointer( pImageBuffer,
nPixels, 1); it crashes in run time pointing it to some corrupted pointer
location. 

Kindly help ASAP. 

Regards,
Richard
-- 
View this message in context: http://itk-insight-users.2283740.n2.nabble.com/Error-using-SetImportPointer-tp5938823p5939178.html
Sent from the ITK Insight Users mailing list archive at Nabble.com.