IO::File - supply object methods for filehandles
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;
IO::File
inherits from IO::Handle
and IO::Seekable
. It extends these classes with methods that are specific to file handles.
Creates an IO::File
. If it receives any parameters, they are passed to the method open
; if the open fails, the object is destroyed. Otherwise, it is returned to the caller.
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, the IO::File
object is destroyed. Otherwise, it is returned to the caller.
open
accepts one, two or three parameters. With one parameter, it is just a front end for the built-in open
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 Perl open
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 Perl sysopen
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-argument open
operator.
For convenience, IO::File
exports the O_XXX constants from the Fcntl module, if this module is available.
binmode
sets binmode
on the underlying IO
object, as documented in perldoc -f binmode
.
binmode
accepts one optional parameter, which is the layer to be passed on to the binmode
call.
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.
perlfunc, "I/O Operators" in perlop, IO::Handle, IO::Seekable, IO::Dir
Derived from FileHandle.pm by Graham Barr <gbarr@pobox.com>.