#!/usr/bin/perl -w
use strict;
use Win32::Clipboard;
use Win32::GuiTest qw(FindWindowLike SetForegroundWindow SendKeys);


# Find a specific Window
my @windows = FindWindowLike(0, qr/^Microsoft Excel/, qr/^XLMAIN$/);

for (@windows) {
    SetForegroundWindow($_);
    SendKeys('{PRTSCR}'); # Alt Print Screen
	sleep 2;
}

# Get the image from the clipboard.
my $screen = Win32::Clipboard::GetBitmap() or die "No image captured: $!\n";

# Print the image to a file.
open    BITMAP, "> pscreen.bmp" or die "Couldn't open bitmap file: $!\n+";
binmode BITMAP;
print   BITMAP $screen;
close   BITMAP;

__END__