private static extern int StartXpsPrintJob(
[MarshalAs(UnmanagedType.LPWStr)] String printerName,
[MarshalAs(UnmanagedType.LPWStr)] String jobName,
[MarshalAs(UnmanagedType.LPWStr)] String outputFileName,
IntPtr progressEvent, // HANDLE
IntPtr completionEvent, // HANDLE
[MarshalAs(UnmanagedType.LPArray)] byte[] printablePagesOn,
UInt32 printablePagesOnCount,
out IXpsPrintJob xpsPrintJob,
out IXpsPrintJobStream documentStream,
IntPtr printTicketStream); // This is actually "out IXpsPrintJobStream", but we don't use it and just want to pass null, hence IntPtr.