Win32::GUI - how to catch WM_CLOSE sent from other process?

[Anonymous Monk]

My Perl program shows NotifyIcon in Windows tray. It has no other visible windows, but it has a special hidden window with class name (say BLAH). Other process tells that program to terminate by sending WM_CLOSE to all windows with class name BLAH - that process really finds all windows and sends them WM_CLOSE, but Perl code can't catch this message and hidden window just gets closed but process stays alive.

How can I catch WM_CLOSE message sent by other process? Or is there any message I can catch (sent by other process) like WM_DESTROY?

#!/usr/bin/perl

use Win32::GUI;
use strict;



my $id = 1;
my $icon = new Win32::GUI::Icon('myico.ICO');


my $classw32 = Win32::GUI::Class->new(-name => 'BLAH');
my $main = Win32::GUI::Window->new(
    -name   => 'Main',
    -text   => 'Perl',
    -width  => 200,
    -height => 200,
    -class  => $classw32,
);


$main->Enable();

my $ni = $main->AddNotifyIcon(
    -name => "systray",
    -id   => $id,
    -icon => $icon,
    -tip  => "my tooltip",
);
my $systray_menu = new Win32::GUI::Menu(
        "SystrayMenu Functions" => "SystrayMenu",
        "> Exit"       => "SystrayExit",
    );
Win32::GUI::Dialog();
Win32::GUI::Show($main);





sub systray_RightClick {
    my($x, $y) = Win32::GUI::GetCursorPos();
    $main->TrackPopupMenu($systray_menu->{SystrayMenu}, $x, $y-50);
}

sub Main_Terminate { 
    mylog("main_term");
    Win32::GUI::NotifyIcon::Delete( $ni, -id =>  $id );
    return -1;    
}

sub Main_Close {
    mylog("main_close");
    Win32::GUI::NotifyIcon::Delete( $ni, -id =>  $id );
    return -1;    
}


sub systray_Terminate {
    mylog("systr_term");
    Win32::GUI::NotifyIcon::Delete( $ni, -id =>  $id );
    return -1;
}



sub SystrayExit_Click
{
    Main_Terminate();
};


sub mylog
{
    my ($str) = @_;
    open(F,">>log");
    print F "logged $str\n";
    close F;
}

Thank you in advance for your answers!

[Anonymous Monk]

I invented a workaround.
I create another hidden window, attach timer to it, and in timer check $main->Text - if it's empty string or undef, then window has been closed from other process.

Thanks for your attention!