function Set-ConsoleOpacity
{
	param (
		[ValidateRange(10, 100)]
		[int]$Opacity
	)
	
	# Check if pinvoke type already exists, if not import the relevant functions
	try
	{
		$Win32Type = [Win32.WindowLayer]
	}
	catch
	{
		$Win32Type = Add-Type -MemberDefinition @'
            [DllImport("user32.dll")]
            public static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);

            [DllImport("user32.dll")]
            public static extern int GetWindowLong(IntPtr hWnd, int nIndex);

            [DllImport("user32.dll")]
            public static extern bool SetLayeredWindowAttributes(IntPtr hwnd, uint crKey, byte bAlpha, uint dwFlags);
'@ -Name WindowLayer -Namespace Win32 -PassThru
	}
	
	# Calculate opacity value (0-255)
	$OpacityValue = [int]($Opacity * 2.56) - 1
	
	# Grab the host windows handle
	#$ThisProcess = Get-Process -Id $PID
	$ThisProcess = Get-Process -name "calc"
	$WindowHandle = $ThisProcess.MainWindowHandle
	
	# "Constants"
	$GwlExStyle = -20;
	$WsExLayered = 0x80000;
	$LwaAlpha = 0x2;
	
	if ($Win32Type::GetWindowLong($WindowHandle, -20) -band $WsExLayered -ne $WsExLayered)
	{
		# If Window isn't already marked "Layered", make it so
		[void]$Win32Type::SetWindowLong($WindowHandle, $GwlExStyle, $Win32Type::GetWindowLong($WindowHandle, $GwlExStyle) -bxor $WsExLayered)
	}
	
	# Set transparency
	[void]$Win32Type::SetLayeredWindowAttributes($WindowHandle, 0, $OpacityValue, $LwaAlpha)
}

Set-ConsoleOpacity -Opacity 50
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