MirOS Manual: Tie::Handle(3p)


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

NAME

     Tie::Handle, Tie::StdHandle  - 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 sec-
     tion 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 argu-
         ments (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

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

     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 refer-
         enced 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 destruc-
         tion 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 compa-
     tible 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.

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