## Presentation Device Driver Reference for OS/2

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### GreEqualRegion - Parameters

hdc (HDC) - input Device context handle.

hrgnSrc1 (HRGN) - input First region handle.

hrgnSrc2 (HRGN) - input Second region handle.

pInstance (PVOID) - input Pointer to instance data.

lFunction (ULONG) - input High-order WORD=flags; low-order WORD= NGreEqualRegion.

rc (LONG) - returns Return codes.

This function returns an integer (lEquality) indicating whether the regions are equal:

EQRGN_EQUAL Equal
EQRGN_ERROR Error
EQRGN_NOTEQUAL Not equal

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.