use warnings;
use strict;
use Tk;
use Win32::API;
use Win32::GUI;
use Win32::API::Callback;



use constant WH_MSGFILTER       => -1;
use constant WH_JOURNALRECORD   =>  0;
use constant WH_JOURNALPLAYBACK =>  1;
use constant WH_KEYBOARD        =>  2;
use constant WH_GETMESSAGE      =>  3;
use constant WH_CALLWNDPROC     =>  4;
use constant WH_CBT             =>  5;
use constant WH_SYSMSGFILTER    =>  6;
use constant WH_MOUSE           =>  7;
use constant WH_HARDWARE        =>  8;
use constant WH_DEBUG           =>  9;
use constant WH_SHELL           => 10;
use constant WH_FOREGROUNDIDLE  => 11;
use constant WH_CALLWNDPROCRET  => 12;
use constant WH_KEYBOARD_LL     => 13;
use constant WH_MOUSE_LL        => 14;

use constant MOD_CONTROL    =>  2;
use constant KEY_A          => 65;

my $mw_win32 = new Win32::GUI::Window(
                           -title   => 'This is a test!',
                           -width   => 100,
                           -height  => 100,
                           -name    => 'MainWindow');

my $GetCurrentThreadId   = new Win32::API('kernel32', 'GetCurrentThreadId',     '', 'N');
my $SetWindowsHookEx     = new Win32::API('user32'  , 'SetWindowsHookEx'  , 'NKNN', 'N');
my $CallNextHookEx       = new Win32::API('user32'  , 'CallNextHookEx'    , 'PNNN', 'N');

Win32::API->Import('user32', 'BOOL RegisterHotKey(HWND hWnd, int id, UINT fsModifiers, UINT vk)')
			or die "import RegisterHotKey: $! ($^W)";



sub KeyboardHook($$$) {
	my ($nCode, $wParam, $lParam) = @_;
	print "nCode=$nCode, wParam=$wParam, lParam=$lParam\n";
	$CallNextHookEx->Call(0, $nCode, $wParam, $lParam);
}

# LRESULT CALLBACK CallWndProc(int nCode,WPARAM wParam, LPARAM lParam);
sub WindowProc($$$) {
	my ($nCode, $wParam, $lParam) = @_;
    print "nCode=$nCode, wParam=$wParam, lParam=$lParam\n";
	print "***************" if $wParam == 273;
	$CallNextHookEx->Call(0, $nCode, $wParam, $lParam);
}

my $WinProc              =  new Win32::API::Callback(\&WindowProc  , 'NNN', 'N');
my $KeyboardHookCallback =  new Win32::API::Callback(\&KeyboardHook, 'NNN', 'N');

my $ThreadId = $GetCurrentThreadId->Call() or die;
my $Hook     = $SetWindowsHookEx->Call(WH_KEYBOARD    , $KeyboardHookCallback, 0 , $ThreadId) or die $^E;
my $ProcHook = $SetWindowsHookEx->Call(WH_GETMESSAGE , $WinProc, 0 , $ThreadId) or die $^E;
#WH_CALLWNDPROC

print $mw_win32->{-handle};
my $hotkey   = RegisterHotKey ($mw_win32->{-handle}, 99, MOD_CONTROL, KEY_A) or die $^E;

$mw_win32->Show();
Win32::GUI::Dialog();