hdc (HDC) - input

Device context handle.

paptlPoint (PPOINTL) - input

Pointer to coordinates array.

An array of cPoints (X,Y) pairs, which contain the (X,Y) coordinates of the end points for the lines. If COM_TRANSFORM is not set, the function expects the points to be in screen coordinates.

cPoints (LONG) - input

Number of coordinate pairs.

If this value is passed as 0, the handling routine does nothing and returns Successful.

pInstance (PVOID) - input

Pointer to instance data.

lFunction (ULONG) - input

High-order WORD=flags; low-order WORD=NGrePolyFillet.

rc (LONG) - returns

Return codes.

This function returns an integer (cHits) indicating, where appropriate, whether correlation hits were detected:

GPI_OK

Successful
GPI_HITS
Successful with correlate hit (returned by display drivers when the correlate 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_BITMAP_NOT_SELECTED
PMERR_COORDINATE_OVERFLOW
PMERR_DEV_FUNC_NOT_INSTALLED
PMERR_HDC_BUSY
PMERR_INV_COLOR_DATA
PMERR_INV_COLOR_INDEX
PMERR_INV_COORD_SPACE
PMERR_INV_HDC
PMERR_INV_IN_AREA
PMERR_INV_IN_PATH
PMERR_INV_LENGTH_OR_COUNT
PMERR_INV_PICK_APERTURE_POSN
PMERR_INV_RECT
PMERR_PATH_LIMIT_EXCEEDED
PMERR_PATH_UNKNOWN

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