rc (ULONG) - returns

Return codes.

This function returns the page units, or GPI_ERROR if an error occurred. The defined page units are described under GreSetPageUnits.

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

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