Return
codes.
This function returns an integer (lComplexity) indicating the complexity
of the region:
RGN_ERROR
RGN_NULL
RGN_RECT
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_DEV_FUNC_NOT_INSTALLED PMERR_HDC_BUSY
PMERR_HRGN_BUSY
PMERR_INSUFFICIENT_MEMORY
PMERR_INV_COORDINATE
PMERR_INV_HDC
PMERR_INV_HRGN
PMERR_INV_RECT
PMERR_REGION_IS_CLIP_REGION
Refer to the "Error
Explanations" section in the Presentation Manager Programming Reference
for further explanation.