NAME
IO::File - supply object methods for filehandles
SYNOPSIS
use IO::File; $fh = IO::File->new(); if ($fh->open("< file")) { print <$fh>; $fh->close; } $fh = IO::File->new("> file"); if (defined $fh) { print $fh "bar\n"; $fh->close; } $fh = IO::File->new("file", "r"); if (defined $fh) { print <$fh>; undef $fh; # automatically closes the file } $fh = IO::File->new("file", O_WRONLY|O_APPEND); if (defined $fh) { print $fh "corge\n"; $pos = $fh->getpos; $fh->setpos($pos); undef $fh; # automatically closes the file } autoflush STDOUT 1;
DESCRIPTION
IO::File
inherits from IO::Handle
and IO::Seekable
. It extends these classes with methods that are specific to file handles.
CONSTRUCTOR
-
new ( FILENAME [,MODE [,PERMS]] )
Creates an
IO::File
. If it receives any parameters, they are passed to the methodopen
; if the open fails, the object is destroyed. Otherwise, it is returned to the caller. -
new_tmpfile
Creates an
IO::File
opened for read/write on a newly created temporary file. On systems where this is possible, the temporary file is anonymous (i.e. it is unlinked after creation, but held open). If the temporary file cannot be created or opened, theIO::File
object is destroyed. Otherwise, it is returned to the caller.
METHODS
- open( FILENAME [,MODE [,PERMS]] )
-
open( FILENAME, IOLAYERS )
open
accepts one, two or three parameters. With one parameter, it is just a front end for the built-inopen
function. With two or three parameters, the first parameter is a filename that may include whitespace or other special characters, and the second parameter is the open mode, optionally followed by a file permission value.If
IO::File::open
receives a Perl mode string (">", "+<", etc.) or an ANSI C fopen() mode string ("w", "r+", etc.), it uses the basic Perlopen
operator (but protects any special characters).If
IO::File::open
is given a numeric mode, it passes that mode and the optional permissions value to the Perlsysopen
operator. The permissions default to 0666.If
IO::File::open
is given a mode that includes the:
character, it passes all the three arguments to the three-argumentopen
operator.For convenience,
IO::File
exports the O_XXX constants from the Fcntl module, if this module is available. -
binmode( [LAYER] )
binmode
setsbinmode
on the underlyingIO
object, as documented inperldoc -f binmode
.binmode
accepts one optional parameter, which is the layer to be passed on to thebinmode
call.
NOTE
Some operating systems may perform IO::File::new()
or IO::File::open()
on a directory without errors. This behavior is not portable and not suggested for use. Using opendir()
and readdir()
or IO::Dir
are suggested instead.
SEE ALSO
perlfunc, I/O Operators in perlop, IO::Handle, IO::Seekable, IO::Dir
HISTORY
Derived from FileHandle.pm by Graham Barr <gbarr@pobox.com>.
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