Local tied methods refering to others

herby1620 has asked for the wisdom of the Perl Monks concerning the following question:

Well, now I've done it. Using Perl/Tk, I have found out how to 'tie' STDOUT to a package. Normally this is the 'Text' module, as it supplies FILEHANDLE, PRINT, PRINTF. Now I want to intercede and do some magic of my own after Text's function with my own 'package'. The normal 'tie' is:

tie *STDOUT, Tk::Text, $text;  # '$text' is a Text widgit.
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What do I need to write in my own 'package' to refer to these actions? I've played around, and it seems very confusing! I guess I want to do something like:

tie *STDOUT, MyMagic, $text;
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Which sounds OK to me, but what should I do after 'package MyMagic' to effect calls to the original methods? Thanks!

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Re: Local tied methods refering to others by davido (Cardinal) on Jan 24, 2006 at 07:16 UTC
I was hooked on playing with tie for awhile a year or so ago, and implemented a few tied filehandle classes to see what I could make of it all. There is some good information in perltie, where it states: "A class implementing a tied filehandle should define the following methods: TIEHANDLE, at least one of PRINT, PRINTF, WRITE, READLINE, GETC, READ, and possibly CLOSE, UNTIE and DESTROY." Also, a generic tied-handle class from which you can learn as well as derive your own tied handle classes comes with the standard Perl distribution as Tie::Handle (and Tie::StdHandle). It's documented here: Tie::Handle. I found it helpful to read through its framework to gather tips on how to write my own tied filehandle class. But it's also useful to know that Tie::Handle defines all of the necessary methods for a tied handle class. The idea is that you can make your own handle class a subclass of Tie::Handle, and then only go the work of overriding those methods that you wish to customize for your own purposes. Dave	[reply]

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Re: Local tied methods refering to others
by davido (Cardinal) on Jan 24, 2006 at 07:16 UTC

I was hooked on playing with tie for awhile a year or so ago, and implemented a few tied filehandle classes to see what I could make of it all. There is some good information in perltie, where it states: "A class implementing a tied filehandle should define the following methods: TIEHANDLE, at least one of PRINT, PRINTF, WRITE, READLINE, GETC, READ, and possibly CLOSE, UNTIE and DESTROY."

Also, a generic tied-handle class from which you can learn as well as derive your own tied handle classes comes with the standard Perl distribution as Tie::Handle (and Tie::StdHandle). It's documented here: Tie::Handle. I found it helpful to read through its framework to gather tips on how to write my own tied filehandle class. But it's also useful to know that Tie::Handle defines all of the necessary methods for a tied handle class. The idea is that you can make your own handle class a subclass of Tie::Handle, and then only go the work of overriding those methods that you wish to customize for your own purposes.

Dave

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