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 v5.12.4                                               2011-06-01                                           Tie::Handle(3pm)