hdc (HDC) - input

Device context handle.

hrgnDst (HRGN) - input

Destination region handle.

prclRect (PRECTL) - input

Pointer to rectangle.

hrgnSrc (HRGN) - input

Region handle.

cmdMode (LONG) - input

Method of combination.

CRGN_OR

Union of hrgnSrc and prclRect.
CRGN_COPY
Uses prclRect only. The hrgnSrc parameter is ignored.
CRGN_XOR
Symmetric difference of hrgnSrc and prclRect.
CRGN_AND
Intersection of hrgnSrc and prclRect.
CRGN_DIFF
Uses hrgnSrc and not (prclRect).

pInstance (PVOID) - input

Pointer to instance data.

lFunction (ULONG) - input

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

rc (LONG) - returns

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

RGN_ERROR

Error
RGN_NULL
Null region
RGN_RECT
Rectangular region
RGN_COMPLEX
Complex region (more than one 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_INSUFFICIENT_MEMORY
PMERR_INV_COORDINATE
PMERR_INV_HRGN
PMERR_INV_RECT
PMERR_INV_REGION_MIX_MODE
PMERR_REGION_IS_CLIP_REGION
Refer to the "Error Explanations" section in the Presentation Manager Programming Reference for further explanation.

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