Here's a working example:

#!perl -w
use strict;
use Win32::GUI ();

use constant WM_DEVICECHANGE => 0x219;
# as per http://msdn.microsoft.com/en-us/library/aa363480%28VS.85%29.a
+spx

sub device_changed {
    my ($win, @args) = @_;
    Win32::GUI::MessageBox(0,"Device changed: @args\n");
};

my $mw = Win32::GUI::Window->new();

$mw->Hook(WM_DEVICECHANGE, \&device_changed);

$mw->Show();

Win32::GUI::Dialog();
print "Done\n";

[download]

A problem with this approach is that WM_DEVICECHANGE does not seem to fire if AutoPlay is disabled for devices, at least I don't get the message when I insert a CF card in my CF card reader, while I get the message when I plug/unplug some other device.

In reply to Re^3: How do I know when a USB device is inserted? by Corion
in thread How do I know when a USB device is inserted? by ZJ.Mike.2009

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