لطفا منتظر باشید ...
 |  |
8.170. PerlIO
An on-demand loader for PerlIO layers
and the root of the PerlIO namespace. PerlIO allows you to expand the
functionality of open(). For example:
use PerlIO 'special';
The code in PerlIO.pm then attempts to find
'special':
require PerlIO::special;
PerlIO currently defines the following layers:unix
Low-level layer that calls read,
write, lseek, etc.
stdio
Calls fread, fwrite,
fseek, ftell, etc.
stdio will use your operating
system's I/O via the C library. That is, you cannot
place any layers beneath stdio.
perlio
A reimplementation of a stdio-like buffering
written as a PerlIO layer. As such, it will call whatever layer is
below it for its operations.
crlf
Does CRLF translation depending on distinguishing text, and binary
files a la MS-DOS.
utf8
Declares that the stream accepts Perl's internal
encoding of characters (which is really UTF-8 on
ASCII machines and UTF-EBCDIC on EBCDIC machines).
This allows any character Perl can represent to be read from or
written to the stream. The
UTF-X encoding is
chosen to render simple text parts (i.e., nonaccented letters,
digits, and common punctuation) human-readable in the encoded file.
raw
A pseudo-layer that performs two functions. It forces the filehandle
to be considered binary at that point in the layer stack, and it
prevents the I/O system from searching before it in the layer
specification. For example:
open($fh,":raw:perlio",...);
raw forces the use of the
perlio layer even if the platform default or the
use open default is something else (such as
:encoding(iso-8859-7)).
|  | |
| 8.169. overload |  | 8.171. PerlIO::Scalar |
Copyright © 2002 O'Reilly & Associates. All rights reserved.
