Denis,

I figured out what the problem is. The OpenPrinter() function's third parameter is to a PRINTER_DEFAULTS structure. In my example, I set this to a null pointer, which is allowable. However, under NT/Win2K, this structure needs to be passed with one of the members set appropriately to allow you to accomplish this. This structure does require the use of embedded pointers. The best I can help you with is the following:

What follows is the C type declaration for the structure, followed by a pseudo-VFP equivalent. IOW, I'm using VFP syntax to define the structure but you can't do it in VFP

// C Declaration
typedef struct _PRINTER_DEFAULTS { 
  LPTSTR      pDatatype; 
  LPDEVMODE   pDevMode; 
  ACCESS_MASK DesiredAccess; 
} PRINTER_DEFAULTS, *PPRINTER_DEFAULTS;
* Pseudo-VFP equalivalent
DEFINE TYPE
  STRING @pDatatype
  STRING @pDevMode
  INTEGER DesiredAccess
ENDDEFINE

It's the DesiredAcess member that's the problem. From my reading of the docs it needs to be set to PRINTER_ALL_ACCESS (0x000F000C). What you can do is pass the following string by reference instead of 0 as the third parameter to OpenPrinter(). REPLICATE(CHR(0), 8) + CHR(12) + CHR(0) + CHR(15) + CHR(0).

Try this and let me know if it works.