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Tie::StdHandle - base class definitions for tied handles |
NAME
Tie::Handle, Tie::StdHandle - base class definitions for tied handles
SUPPORTED PLATFORMS
- Linux
- Solaris
- Windows
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
TIEHANDLE, PRINT, PRINTF and GETC.
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.LISTwould 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.
- 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 the perltie manpage section contains an example of tying handles.
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Tie::StdHandle - base class definitions for tied handles |