#! C:/perl/bin/perl -w

use strict;
use Win32::API;

use vars qw($rv);
use constant BM_CLICK => hex('F5');

my $findwindow = new Win32::API("user32", 
	"FindWindowA", 
	['P','P'], 
	'N');

my $findwindowex = new Win32::API("user32", 
	"FindWindowExA", 
	['N','N','P','P'], 
	'N');

my $sendmessage = new Win32::API("user32", 
	"SendMessageA", 
	['N','N','N','P'], 
	'N');

my $setactivewindow = new Win32::API("user32", 
	"SetActiveWindow", 
	['N'], 
	'N');
	
# Find the handle of the parent window. In this case 
# 'Calculator' is the text shown in the title bar

my $hwnd = $findwindow->Call( 0,'Calculator');
print "Parent window handle = $hwnd\n";

# Find the handle of the buttons we want to press. 
# Sometimes, but not always, the caption shown on the button

my $hex_button = $findwindowex->Call($hwnd, 0, 0, 'Hex');
my $dec_button = $findwindowex->Call($hwnd, 0, 0, 'Dec');
my $oct_button = $findwindowex->Call($hwnd, 0, 0, 'Oct');
my $bin_button = $findwindowex->Call($hwnd, 0, 0, 'Bin');

$rv = $setactivewindow->Call($hwnd);
print "setactivewindow returned = $rv\n";

foreach ($hex_button,$dec_button,$oct_button,$bin_button) {
	$rv = $sendmessage->Call($_ , BM_CLICK, 0, 0);
	print "sendmessage returned = $rv\n";
	sleep 2;
}