## Presentation Device Driver Reference for OS/2

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### GreRectVisible - Parameters

hdc (HDC) - input Device context handle.

prclRect (PRECTL) - input Pointer to rectangle in world or screen 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= NGreRectVisible.

rc (LONG) - returns Return codes.

This function returns an integer (lVisible) indicating the visibility of the rectangle.

RVIS_ERROR Error
RVIS_INVISIBLE Not visible
RVIS_PARTIAL Partially visible
RVIS_VISIBLE All visible

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_INV_COORD_SPACE
PMERR_INV_COORDINATE
PMERR_INV_HDC
PMERR_INV_LENGTH_OR_COUNT
PMERR_INV_RECT

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