--- Net::FTP#get(localfile, remotefile = File.basename(localfile), blocksize = DEFAULT_BLOCKSIZE)
--- Net::FTP#get(localfile, remotefile = File.basename(localfile), blocksize = DEFAULT_BLOCKSIZE) { |data| .... }

    binaryͤ˽äƥ⡼ȥե
    localfileե̾Ȥե¸ޤ
    remotefileάlocalfileΥ١͡ब
    ꤵޤ
    block_sizeάDEFAULT_BLOCLSIZEꤵޤ
    ͤ binary ǤȤΤͭǤ

    ֥åͿ줿ϤΥǡե˽񤭤ऴȤˡ
    񤭹ǡ data ƥ֥åɾޤ
    ֥åǸɾȤ줿ͤ get ͤˤʤޤ

    ֥åͿʤä get ͤ nil Ǥ

