hdc (HDC) - input

Device context handle.

hrgn (HRGN) - input

Region handle.

prclRect (PRECTL) - input

Pointer to rectangle in device coordinates.

RECTL structure:

xLeft

Minimum X-coordinate of rectangle
yBottom
Minimum Y-coordinate
xRight
Maximum X-coordinate of rectangle
yTop
Maximum Y-coordinate

pInstance (PVOID) - input

Pointer to instance data.

lFunction (ULONG) - input

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

rc (LONG) - returns

Return codes.

This function returns an integer (lComplexity) indicating the complexity of the 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_HRGN_BUSY 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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