- NAME
- SYNOPSIS
- DESCRIPTION
- MORE INFORMATION

# NAME

Tie::Handle - 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 TIESCALAR, FETCH and STORE. The new method is provided as a means of grandfathering, for classes that forget to provide their own TIESCALAR method.

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, classname`. Associates a new glob instance with the specified class. LIST would represent additional arguments (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 offset.

READLINE this

  Read a single line

GETC this

  Get a single character

DESTROY this

  Free the storage associated with the tied handle referenced by this. This is rarely needed, as Perl manages 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.