the objects provided by modules like IO::Scalar are not backed by real file descriptors at the OS level, and so, they can not be passed to C functions requiring open files as arguments (unless those functions have been modified to use PerlIO, but this is quite rare).

In reply to Re^2: reading image blob w/Image::Magick by salva
in thread reading image blob w/Image::Magick by yoz-y

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