


Tie::Handle(3p)  Perl Programmers Reference Guide Tie::Handle(3p)


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.





29/Apr/1999            perl 5.005, patch 03                     1





Tie::Handle(3p)  Perl Programmers Reference Guide Tie::Handle(3p)


       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.









































29/Apr/1999            perl 5.005, patch 03                     2


