--- Net::FTP#getbinaryfile(remotefile, localfile, blocksize = DEFAULT_BLOCKSIZE, callback = nil)

    СΥХʥեgetޤ 

    callback֥åꤵ줿
    ǡ뤴ȤˤƤӽФޤ 

    ruby 1.7 feature: localfile Ͼάǽˤʤޤ
    File.basename(remotefile) άͤˤʤޤ

