hdc (HDC) - input

Device context handle.

prclRect (PRECTL) - input

Pointer to rectangle in world or device coordinates.

RECTL structure:

xLeft

Minimum x-coordinate of rectangle
yBottom
Minimum y-coordinate
xRight
Maximum x-coordinate of rectangle
yTop
Maximum y-coordinate
All the boundaries of this rectangle are considered to be part of the interior and are clipped accordingly.

pInstance (PVOID) - input

Pointer to instance data.

lFunction (ULONG) - input

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

rc (LONG) - returns

Return codes.

This function returns an integer (lComplexity) indicating the complexity of the DC region:

RGN_ERROR

Error
RGN_NULL
Null region
RGN_RECT
Rectangular region
RGN_COMPLEX
Complex region (more than 1 rectangle)
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_COORDINATE_OVERFLOW PMERR_DEV_FUNC_NOT_INSTALLED
PMERR_HDC_BUSY
PMERR_INSUFFICIENT_MEMORY
PMERR_INV_COORD_SPACE
PMERR_INV_COORDINATE
PMERR_INV_HDC
PMERR_INV_HRGN
PMERR_INV_IN_AREA
PMERR_INV_IN_PATH
PMERR_INV_LENGTH_OR_COUNT
PMERR_INV_RECT
PMERR_INV_REGION_CONTROL

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