From: perl-win32-users-boun...@listserv.activestate.com
[mailto:perl-win32-users-boun...@listserv.activestate.com] On Behalf Of
Greg Aiken
Sent: 16 April 2009 16:25
To: perl-win32-users@listserv.activestate.com
Subject: active perl 5.8.8 build 820 inconsistent behavior with $input
=<STDIN>;
> I seem to be experiencing inconsistency when I invoke;
>
> $user_input = <STDIN>;
>
> in some programs the behavior is as expected. at that point in the
program I type in some input from keyboard > then the moment I press the
'enter' key, the program flow returns back to the executing Perl
program.
>
> other times, I get a rather unusual response.
>
> I type in user input from the keyboard and when I press the 'enter'
key, instead of having program flow return > back to the program, the
enter key is instead OUTPUT TO THE DOS CONSOLE SCREEN and the cursor
drops down one
> line on the console screen! when this happens, the program flow does
NOT return back to the program and my
> program just hangs there.
>
> any explanation for this?
>
> more importantly, whats the fix?
>
> today it just happened again. the relevant block of code is here...
Actually, I think the relevant block of code may be further down.
[Some stuff deleted]
> sub assign_xml_request_from_xml_file {
> open (IN, "xml.request");
> undef $/;
You have just globally changed the input record separator to slurp mode,
for all input. This may be the cause of your problem. This is one of the
few instances where 'local' is needed, i.e. to temporarily change the
value of a special variable. Make that:
local $/;
> my $xml_request = <IN>;
> return $xml_request;
> }
>
> sub assign_http_request_from_http_file {
> open (IN, "http.request");
> undef $/;
> my $http_request = <IN>;
> return $http_request;
> }
The above two functions look identical apart from the filename, so why
not use a single function. For example, here is one I wrote earlier:
sub read_file {
my $fn = shift;
open my $fd, "<", $fn or die "Failed to open $fn: $!\n";
local $/;
my $data = <$fd>;
close $fd;
return $data;
}
Note the 3 argument form of open, and the localised file handle. Or
course, if you can install File::Slurp, you don't even need to write
one.
Also, its better to call subs without the '&' prefix, unless you know
what that does, and you need it.
HTH
--
Brian Raven
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