[ITK] [ITK-dev] making a localbuffer from a big file

[Marco Dev]

Hi dears,
How can to make a Local Buffer from a big file and pass it to
importimagefilter

const char * buffer
typedef ImageType::PixelType PixelType;
PixelType* pixelData = static_cast< PixelType*>( buffer );
const unsigned int totalNumberOfPixels= nx * ny;
import->SetImportPointer(pixelData,totalNumberOfPixels,importFilterWillDeleteTheInputBuffer
);
importer->Update();
return importer->GetOutput();

How can I generate Buffer when I have a big file for example  300MB and
when I cast to pixel Data
Just brings one char

Thanks in advance
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