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How do I treat a string like a filehandle?

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Contributed by Anonymous Monk on Sep 16, 2000 at 00:25 UTC
Q&A  > strings


Description:

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>;

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