Tie::Handle - base class definitions for tied handles
package NewHandle; require Tie::Handle; @ISA = (Tie::Handle); sub READ { ... } # Provide a needed method sub TIEHANDLE { ... } # Overrides inherited method package main; tie *FH, 'NewHandle';
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:
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 length bytes of data from scalar starting at offset.
Print the values in LIST
Print the values in LIST using format
Read length bytes of data into scalar starting at offset.
Read a single line
Get a single character
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.
The the perltie manpage section contains an example of tying handles.