hdc (HDC) - input

Device context handle.

hrgn (HRGN) - input

Region handle.

pScanData (PSCANDATA) - input

Pointer to a SCANDATA structure:

pslFirstLeft

Pointer to the left end of the first polyshortline
pslLastLeft
Pointer the left end of the last polyshortline
pslFirstRight
Pointer to right edge of first polyshortline
pslLastRight
Pointer to right edge of last polyshortline
c
Number of scan lines
rclBound
RECTL structure defining the bounding rectangle
slh
SHORTLINEHEADER structure: ulStyle
Line style
ulFormat
Line format
ptlStart
(x, y) position of start
ptlStop
(x, y) position of end
lxLeft
Left edge of bounding rectangle
lxRight
Right edge of bounding rectangle
pslhNext
Pointer to next shortline
pslhPrev
Pointer to previous shortline
This structure is a discrete representation of a curve that starts at point (x0, y0) and ends at point (x1, y1). For each of the (y1-y0+1) rows, there is exactly one X value contained in the X array. The final point in the series is not drawn.
ax
Array of X values, as device coordinates.

pInstance (PVOID) - input

Pointer to instance data.

lFunction (ULONG) - input

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

rc (BOOL) - returns

This function returns BOOLEAN (fSuccess).

TRUE

Successful
FALSE
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_HRGN_BUSY
PMERR_INSUFFICIENT_MEMORY
PMERR_INV_HRGN
PMERR_REGION_IS_CLIP_REGION
Refer to the "Error Explanations" section in the Presentation Manager Programming Reference for further explanation.

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