IO::String - phpMan

NAME
    IO::String - Emulate file interface for in-core strings

SYNOPSIS
     use IO::String;
     $io = IO::String->new;
     $io = IO::String->new($var);
     tie *IO, 'IO::String';

     # read data
     <$io>;
     $io->getline;
     read($io, $buf, 100);

     # write data
     print $io "string\n";
     $io->print(@data);
     syswrite($io, $buf, 100);

     select $io;
     printf "Some text %s\n", $str;

     # seek
     $pos = $io->getpos;
     $io->setpos(0);        # rewind
     $io->seek(-30, -1);
     seek($io, 0, 0);

DESCRIPTION
    The "IO::String" module provides the "IO::File" interface for in-core
    strings. An "IO::String" object can be attached to a string, and makes
    it possible to use the normal file operations for reading or writing
    data, as well as for seeking to various locations of the string. This is
    useful when you want to use a library module that only provides an
    interface to file handles on data that you have in a string variable.

    Note that perl-5.8 and better has built-in support for "in memory"
    files, which are set up by passing a reference instead of a filename to
    the open() call. The reason for using this module is that it makes the
    code backwards compatible with older versions of Perl.

    The "IO::String" module provides an interface compatible with "IO::File"
    as distributed with IO-1.20, but the following methods are not
    available: new_from_fd, fdopen, format_write, format_page_number,
    format_lines_per_page, format_lines_left, format_name, format_top_name.

    The following methods are specific to the "IO::String" class:

    $io = IO::String->new
    $io = IO::String->new( $string )
        The constructor returns a newly-created "IO::String" object. It
        takes an optional argument, which is the string to read from or
        write into. If no $string argument is given, then an internal buffer
        (initially empty) is allocated.

        The "IO::String" object returned is tied to itself. This means that
        you can use most Perl I/O built-ins on it too: readline, <>, getc,
        print, printf, syswrite, sysread, close.

    $io->open
    $io->open( $string )
        Attaches an existing IO::String object to some other $string, or
        allocates a new internal buffer (if no argument is given). The
        position is reset to 0.

    $io->string_ref
        Returns a reference to the string that is attached to the
        "IO::String" object. Most useful when you let the "IO::String"
        create an internal buffer to write into.

    $io->pad
    $io->pad( $char )
        Specifies the padding to use if the string is extended by either the
        seek() or truncate() methods. It is a single character and defaults
        to "\0".

    $io->pos
    $io->pos( $newpos )
        Yet another interface for reading and setting the current read/write
        position within the string (the normal getpos/setpos/tell/seek
        methods are also available). The pos() method always returns the old
        position, and if you pass it an argument it sets the new position.

        There is (deliberately) a difference between the setpos() and seek()
        methods in that seek() extends the string (with the specified
        padding) if you go to a location past the end, whereas setpos() just
        snaps back to the end. If truncate() is used to extend the string,
        then it works as seek().

BUGS
    In Perl versions < 5.6, the TIEHANDLE interface was incomplete. If you
    use such a Perl, then seek(), tell(), eof(), fileno(), binmode() will
    not do anything on an "IO::String" handle. See perltie for details.

SEE ALSO
    IO::File, IO::Stringy, "open" in perlfunc

COPYRIGHT
    Copyright 1998-2005 Gisle Aas.

    This library is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself.

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