Tie::Handle(3) Perl Programmers Reference Guide Tie::Handle(3)NAME
Tie::Handle, Tie::StdHandle - base class definitions for
tied handles
SYNOPSIS
package NewHandle;
require Tie::Handle;
@ISA = (Tie::Handle);
sub READ { ... } # Provide a needed method
sub TIEHANDLE { ... } # Overrides inherited method
package main;
tie *FH, 'NewHandle';
DESCRIPTION
This module provides some skeletal methods for handle-
tying classes. See the perltie manpage for a list of the
functions required in tying a handle to a package. The
basic Tie::Handle package provides a "new" method, as well
as methods "TIEHANDLE", "PRINT", "PRINTF" and "GETC".
For developers wishing to write their own tied-handle
classes, the methods are summarized below. The the perltie
manpage section not only documents these, but has sample
code as well:
TIEHANDLE classname, LIST
The method invoked by the command "tie *glob, class
name". Associates a new glob instance with the speci
fied class. "LIST" would represent additional argu
ments (along the lines of the AnyDBM_File manpage and
compatriots) needed to complete the association.
WRITE this, scalar, length, offset
Write length bytes of data from scalar starting at
offset.
PRINT this, LIST
Print the values in LIST
PRINTF this, format, LIST
Print the values in LIST using format
READ this, scalar, length, offset
Read length bytes of data into scalar starting at off_
set.
READLINE this
Read a single line
GETC this
Get a single character
CLOSE this
Close the handle
OPEN this, filename
(Re-)open the handle
BINMODE this
Specify content is binary
EOF this
Test for end of file.
TELL this
Return position in the file.
SEEK this, offset, whence
Position the file.
Test for end of file.
DESTROY this
Free the storage associated with the tied handle ref
erenced by this. This is rarely needed, as Perl man
ages its memory quite well. But the option exists,
should a class wish to perform specific actions upon
the destruction of an instance.
MORE INFORMATION
The the perltie manpage section contains an example of
tying handles.
COMPATIBILITY
This version of Tie::Handle is neither related to nor com
patible with the Tie::Handle (3.0) module available on
CPAN. It was due to an accident that two modules with the
same name appeared. The namespace clash has been cleared
in favor of this module that comes with the perl core in
September 2000 and accordingly the version number has been
bumped up to 4.0.
2001-02-22 perl v5.6.1 Tie::Handle(3)
