huschi.net

Tie::Handle(3pm)       Perl Programmers Reference Guide       Tie::Handle(3pm)
NAME
       Tie::Handle - base class definitions for tied handles
SYNOPSIS
           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';
DESCRIPTION
       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 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 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 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
       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
           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 perltie section contains an example of tying handles.
COMPATIBILITY
       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 v5.26.3                      2018-03-01                  Tie::Handle(3pm)