[vtkusers] Loading Images from Memory

[Mathieu Malaterre]

Salut Mathieu,

	Two things:

#1 If you are trying to load a memory buffer into a vtkImageData and 
this memory buffer is uncompressed and indeed contains something VTK can 
deal with (RBG values for instance). Then yes they are multiple way of 
doing so.

#2. If you are looking for the API of the libpng to do memory file 
decompression, then this is not the right ML for that. I'd suggest 
posting to the libpng newsgroups or ML. The vtkPNGReader is only dealing 
with files.

HTH
Mathieu

Mathieu Bosi wrote:
> Hi to everyone, my name is Mathieu Bosi.
> 
> I'm new to vtk and currently I'm facing with this Issue:
> I have to load a geric image (i.e. PNG) from a compressed archive and 
> currently I'm able to extract the file to memory.
> Is it actually possible to load an image from a "memory file"?
> 
> More precisely I would like to achieve something like this:
> 
> ----------------------------
> 
> int size; // how many bytes we'll have in mem_ptr[]
> 
> byte *mem_ptr = feedFromArchive( archive_file_name, 
> file_name_in_archive,   &size );
> 
> vtkPNGReader  *png_reader  = vtkPNGReader::New();
> 
> png_reader->SetMemFile( mem_ptr, size ); // <-- Versus --> the file 
> version:  png_reader->SetFileName( img_file_name );
> png_reader->Update();
> 
> ----------------------------
> 
> Actually the only (rude) way I've found is to dump from the memory to a 
> temporary file and then passing that file name as a parameter to the 
> canonical "vtkPNGReader::SetFileName()" is that the only solution?
> 
> 
> Thanks in advance for your kind attention
> 
>  - Mathieu Bosi -
> 
> 
> 
> 
>  
> 
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> This is the private VTK discussion list. 
> Please keep messages on-topic. Check the FAQ at: http://www.vtk.org/Wiki/VTK_FAQ
> Follow this link to subscribe/unsubscribe:
> http://www.vtk.org/mailman/listinfo/vtkusers