I found Term::ReadKey can capture ctrl + c on windows 

use strict;
use warnings;

use Term::ReadKey;
ReadMode "raw"; #raw can capture ctrl + c
while(1){
        print "prompt>\n";
    #sleep 30 seconds
    my $char = ReadKey 30;
    next if (! defined $char);

    if (ord $char == 3 ){
        print "control + c\n";
        last;
    }
    
    #check database

    #process image
}
ReadMode "restore";

[download]
If I pressed ctrl + c while processing something, it will abort. So if I could write like this... (there seems no such function like "BindEvent"). 
ReadMode "raw"; #raw can capture ctrl + c
BindEvent "keypress", sub {
    my ($keycode) = @_;
    if ($keycode == 3){
         ReadMode "restore";
         #disconnect database
         exit;
    }
};

#main loop
while(1){
    ReadKey 30;
    #check database
    #process images
}
ReadMode "restore";

[download]
regards.

updated:
I read about Glib main loop, 　Re: Perl Hotkey/Shortcut. I'll try it after I sleep several hours;

In reply to Re^3: ctrl + c on Win32 (signal handling) by remiah
in thread ctrl + c on Win32 (signal handling) by remiah

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