rc (ULONG) - returns

Return Code.

The value returned by this function depends on whether the presentation driver is requested to realize or to delete the font. When realizing or loading a font, the handling routine must return a 32-bit logical font handle (GPI_ALTERROR), or 0 if the match (or load) was unsuccessful.

When deleting a font, the handling routine must return:

GPI_OK

Successful
GPI_ERROR
Error
Possible Errors Detected: When an error is detected, the handling routine must call WinSetErrorInfo to post the condition. Error codes for conditions that the handling routine is expected to check include:

PMERR_COORDINATE_OVERFLOW PMERR_DEV_FUNC_NOT_INSTALLED
PMERR_HDC_BUSY
PMERR_INV_COORD_SPACE
PMERR_INV_HDC
PMERR_INV_LENGTH_OR_COUNT

Refer to the "Error Explanations" section on the Presentation Manager Programming Reference for further explanation.