NAME
IO::File - supply object methods for filehandles
SYNOPSIS
use IO::File;
$fh = new IO::File; if ($fh->open("< file")) { print <$fh>; $fh->close; }
$fh = new IO::File "> file"; if (defined $fh) { print $fh "bar\n"; $fh->close; }
$fh = new IO::File "file", "r"; if (defined $fh) { print <$fh>; undef $fh; # automatically closes the file }
$fh = new IO::File "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::Fileopened 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::Fileobject is destroyed. Otherwise, it is returned to the caller.
METHODS
- open( FILENAME [,MODE [,PERMS]] )
- open( FILENAME, IOLAYERS )
openaccepts one, two or three parameters. With one parameter, it is just a front end for the built-inopenfunction. 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::openreceives a Perl mode string (">", "+<", etc.) or an ANSI C fopen() mode string ("w", "r+", etc.), it uses the basic Perlopenoperator (but protects any special characters).If
IO::File::openis given a numeric mode, it passes that mode and the optional permissions value to the Perlsysopenoperator. The permissions default to 0666.If
IO::File::openis given a mode that includes the:character, it passes all the three arguments to the three-argumentopenoperator.For convenience,
IO::Fileexports the O_XXX constants from the Fcntl module, if this module is available. - binmode( [LAYER] )
binmodesetsbinmodeon the underlyingIOobject, as documented inperldoc -f binmode.binmodeaccepts one optional parameter, which is the layer to be passed on to thebinmodecall.
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>.

