internal static extern bool DeleteForm(SafePrinterHandle hPrinter, string formName);
internal static extern bool EnumForms(SafePrinterHandle hPrinter, int level, IntPtr pBuf, int cbBuf, out int pcbNeeded, out int pcReturned);
internal static extern bool AddForm(SafePrinterHandle hPrinter, int level, [In] ref FORM_INFO_1 form);
internal static extern bool OpenPrinter(string szPrinter, out SafePrinterHandle hPrinter, IntPtr pd);