Return
Codes.
On completion, the handling routine must return a LONG integer (cHits) indicating,
where appropriate, whether correlation hits were detected:
GPI_OK
GPI_HITS
Successful with correlation hit (returned
by the display driver when the correlation flag is ON, and a hit is detected)
GPI_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.