How can I use File::ChangeNotify on Windows?

Question

I installed File::ChangeNotify on Windows System and try to run the following code :

my $watcher =
     File::ChangeNotify->instantiate_watcher
         ( directories => [ 'C:\files' ],
             filter  => qr/\.txt$/
         );


 # # blocking
 while ( my @events = $watcher->wait_for_events() ) { print "new event"}

When I ran the script and try to create a new .txt file or modify a .txt file under c:\\files the script didn't print anything.

Answer 1

It works for me (on linux) if I add this line:

$| = 1;

Then I see new event .

Refer to perldoc perlvar : $| or $OUTPUT_AUTOFLUSH

Here is the complete code:

use warnings;
use strict;
use File::ChangeNotify;

$| = 1;

my $watcher =
     File::ChangeNotify->instantiate_watcher
         ( directories => [ 'C:\files' ],
             filter  => qr/\.txt$/
         );


 # # blocking
 while ( my @events = $watcher->wait_for_events() ) { print "new event"}

UPDATE: As cjm astutely points out, adding a newline works as an alternative to $| :

 while ( my @events = $watcher->wait_for_events() ) { print "new event\n"}