rc (ULONG) - returns

Return codes.

When called with ulSize specified as 0, it returns the size of the buffer required to save the transform state. Otherwise, it returns GPI_OK to indicate a successful completion. In either case, GPI_ERROR is returned to indicate failure.

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_HDC_BUSY
PMERR_INV_HDC
PMERR_INV_LENGTH_OR_COUNT

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