Looking through the Net::FTP code, I think this is
because your tied handle doesn't have a valid file
descriptor. Which, I think, would make sense, since
it's not actually associated with a real file.
See, Net::FTP calls fileno on the filehandle you pass
in; if the result is undef (as it is in your case), it
treats the handle as a file path. Which doesn't exist,
obviously.
Unfortunately I don't know how to solve your
problem. :( It may be just a limitation that can't
be fixed.
Update: it turns out that in 5.6 you can
define a FILENO method for your tied filehandle
class. So you could possibly use that to make
Net::FTP work properly with your tied filehandle.
The 5.6 perltie is at http://search.cpan.org/doc/GSAR/perl-5.6.0/pod/perltie.pod if you don't have it locally.
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