Hello Chris,
Can Win32::ChangeNotify return more messages such as which files or folders are modified?
Are there any other modules for this purpose?
Many thanks
David Zhang
Show quoted text-----Original Message-----
From: Christopher J. Madsen via RT [mailto:bug-Win32-IPC@rt.cpan.org]
Sent: Thursday, May 17, 2012 4:29 PM
To: Zhang, David
Subject: [rt.cpan.org #77261] Win32::ChangeNotify always watches subtree
<URL:
https://rt.cpan.org/Ticket/Display.html?id=77261 >
This turns out to be a problem with the underlying FindFirstChangeNotification API. There's nothing I can do about it.
Here's the program I used to test it:
use 5.010;
use strict;
use warnings;
use Win32::ChangeNotify;
my $notify = Win32::ChangeNotify->new(".", 0, # no subtree
'FILE_NAME DIR_NAME LAST_WRITE');
say 'waiting...';
while ($notify->wait) {
say "change!";
$notify->reset;
}
I ran that script, and then in another console created & removed files in the watched directory and subdirectories of it. I sometimes got a notification when changing files in a subdirectory (although not all the time).
I verified that it's a Windows bug by running the equivalent C program, which gave similar results:
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdio.h>
int main(int argc, char* argv[])
{
HANDLE cn = FindFirstChangeNotification(".", FALSE,
FILE_NOTIFY_CHANGE_FILE_NAME |
FILE_NOTIFY_CHANGE_DIR_NAME |
FILE_NOTIFY_CHANGE_LAST_WRITE );
puts("waiting");
while (WaitForSingleObject(cn, INFINITE) == WAIT_OBJECT_0) {
puts("change!");
FindNextChangeNotification(cn);
}
return 0;
} /* end main */
