Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses

How do I treat a string like a filehandle?

( #32740=categorized question: print w/ replies, xml ) Need Help??
Contributed by Anonymous Monk on Sep 16, 2000 at 00:25 UTC
Q&A  > strings


I want to be able to play with a string as if it were a I/O stream. You can see this sort of functionality in C++ with sstream, and in Java with StringBuffer*Stream. A simple e.g., I'd love to be able to do something like:
my $stringfile = FileHandle::newFromString( "One fish\nTwo fish\nThree + fish\nFour fish" ); while( <$stringfile> ) { dosomething( $_ ); }
...but on a larger scale. Cheers, - jsproat

Answer: How do I treat a string like a filehandle?
contributed by davido

You may open a file handle to "in memory" files (ie, scalars... or strings), if you're using a new enough version of Perl. I believe this feature was introduced with 5.8.0.

Per perlfunc:open; 'File handles can be opened to "in memory" files held in Perl scalars via:
open( $fh, '>', \$variable) || die ....
Though if you try to re-open STDOUT or STDERR as an "in memory" file, you have to close it first.'

Another example provided in the POD is:

open(MEMORY, '>', \$var) or die "Can't open memory file: $!\n"; print MEMORY "foo!\n";

Answer: How do I treat a string like a filehandle?
contributed by runrig

See IO::Scalar from the IO-stringy module on CPAN.

Answer: How do I treat a string like a filehandle?
contributed by indigo

Use a pipe:

#!/usr/bin/perl -w use FileHandle; use strict; my $string =<<EOD; One fish Two fish Red fish Blue fish EOD my $fh = new FileHandle("echo \'$string\' |") or die; print $_ while <$fh>;

Please (register and) log in if you wish to add an answer

  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?

    What's my password?
    Create A New User
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others making s'mores by the fire in the courtyard of the Monastery: (6)
    As of 2016-08-28 01:25 GMT
    Find Nodes?
      Voting Booth?
      The best thing I ever won in a lottery was:

      Results (390 votes). Check out past polls.