The OpenPrinter function retrieves a handle to the specified printer or print server or other types of handles in the print subsystem.
так что как минимум нужно испольвать ее результат при вызове функции getprinter и setprinter (она должна возвратить hPrinter) хотя может я и не прав

т е hPrinter=OpenPrinter(cPrinter, @hPrinter, lcPrnDefaults)

BOOL GetPrinter(
HANDLE hPrinter, // handle to printer
DWORD Level, // information level
LPBYTE *pPrinter, // printer information buffer
DWORD cbBuf, // size of buffer
LPDWORD pcbNeeded // bytes received or required
);
Parameters
hPrinter
[in] Handle to the printer for which the function retrieves information. Use the OpenPrinter or AddPrinter function to retrieve a printer handle. Level
[in] Specifies the level or type of structure that the function stores into the buffer pointed to by pPrinter.
Windows 95/98/Me: This value can be 1, 2, or 5.

Windows NT/2000/XP: This value can be 1, 2, 3, 4, 5, 6, 7, 8 or 9.

pPrinter
[out] Pointer to a buffer that receives a structure containing information about the specified printer. The buffer must be large enough to receive the structure and any strings or other data to which the structure members point. If the buffer is too small, the pcbNeeded parameter returns the required buffer size.
The type of structure is determined by the value of Level.

2elena
а у вас почтовый ящик есть

просто я не обещаю но если получеться чего я пришлю
сами понимаете проблема не очень легкая