Re^2: reading image blob w/Image::Magick

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).

Comment on Re^2: reading image blob w/Image::Magick

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Re^3: reading image blob w/Image::Magick by davidrw (Prior) on Apr 16, 2006 at 22:02 UTC
Image::Magick can read from perl filehandles though: `$image = Image::Magick->new; open(IMAGE, 'image.gif'); $image->Read(file=>\*IMAGE); close(IMAGE);` [download] despite that, IO::Scalar wouldn't work?	[reply] [d/l]
Re^4: reading image blob w/Image::Magick by salva (Canon) on Apr 16, 2006 at 22:12 UTC
`open(IMAGE, 'image.gif')` opens a real file using the OS services but IO::Scalar objects exists only inside perl. You can see the difference using the `fileno()` builtin: `open IMAGE, "image.gif"; printf "fn: %d\n", fileno(IMAGE); my $ios = IO::Scalar->new; printf "fn: %d\n", fileno($ios);` [download]	[reply] [d/l] [select]