please look at this print project, very difficult

[chunming]

hi, Dear Leader(i think you are enough for my project
leader),
I have a very fancy question and I need your help:
I use C#.net to develop a Point of Sales system, use Epson
Tm-t88 printer( POS printer), connected w/ :LPT1, and now:
I have following problem:

when i finished installing the driver, the test page is ok
If I use notepad to print something by choose this printer
in printer dialog, it works fine,
if I use MS word to print something by choose thisprinter
in printer dialog, it does not work
and, i wrote down a application by using :
[DllImport("wins pool.Drv", EntryPoint="Ope nPrinterA",
SetLastError=tr ue, CharSet=CharSet .Ansi,
ExactSpelling=t rue,
CallingConventi on=CallingConve ntion.StdCall)]

public static extern bool OpenPrinter([MarshalAs
(UnmanagedType. LPStr)] string szPrinter, out IntPtr
hPrinter, long pd);

and it does not work, I could c there is a printer icon at
the right bottom but after a little while, it disappeared,
so, what's problem?

I test w/ my another IBM T20 notebook, it is same

thank you very much if you could try to give me some hint,
I am really need you help for my project, thanks

sincerely,

Richard