Tie::Handle(3p) Perl Programmers Reference Guide Tie::Handle(3p) #
Tie::Handle(3p) Perl Programmers Reference Guide Tie::Handle(3p)
NNAAMMEE #
Tie::Handle - base class definitions for tied handles
SSYYNNOOPPSSIISS #
package NewHandle;
require Tie::Handle;
@ISA = qw(Tie::Handle);
sub READ { ... } # Provide a needed method
sub TIEHANDLE { ... } # Overrides inherited method
package main;
tie *FH, 'NewHandle';
DDEESSCCRRIIPPTTIIOONN #
This module provides some skeletal methods for handle-tying classes. See
perltie for a list of the functions required in tying a handle to a
package. The basic TTiiee::::HHaannddllee 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 perltie 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 AnyDBM_File and compatriots)
needed to complete the association.
WRITE this, scalar, length, offset
Write _l_e_n_g_t_h bytes of data from _s_c_a_l_a_r starting at _o_f_f_s_e_t.
PRINT this, LIST
Print the values in _L_I_S_T
PRINTF this, format, LIST
Print the values in _L_I_S_T using _f_o_r_m_a_t
READ this, scalar, length, offset
Read _l_e_n_g_t_h bytes of data into _s_c_a_l_a_r starting at _o_f_f_s_e_t.
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 referenced by _t_h_i_s.
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.
MMOORREE IINNFFOORRMMAATTIIOONN #
The perltie section contains an example of tying handles.
CCOOMMPPAATTIIBBIILLIITTYY #
This version of Tie::Handle is neither related to nor compatible 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.
perl v5.36.3 2023-02-15 Tie::Handle(3p)