## Presentation Device Driver Reference for OS/2

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### GreDrawBits Return Value - rc

rc (ULONG) - returns Return Codes.

On completion, the handling routine must return a LONG integer (cHits) indicating, where appropriate, whether correlation hits were detected:

GPI_OK Successful
GPI_HITS Successful with correlation hit (returned by the display driver when the correlation flag is ON, and a hit is detected)
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_BASE_ERROR
PMERR_HDC_BUSY
PMERR_INCORRECT_DC_TYPE
PMERR_INV_BITBLT_MIX
PMERR_INV_BITBLT_STYLE
PMERR_INV_COORDINATE
PMERR_INV_HDC
PMERR_INV_LENGTH_OR_COUNT
PMERR_INV_RECT

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