## Presentation Device Driver Reference for OS/2

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### GreGetDefaultViewingLimits - Parameters

hdc (HDC) - input Device context handle.

prclViewingLimits (PRECTL) - input Pointer to limits of viewing area.

RECTL structure:

xLeft Minimum x-coordinate of viewing limits
yBottom Minimum y-coordinate
xRight Maximum x-coordinate of viewing limits
yTop Maximum y-coordinate

pInstance (PVOID) - input Pointer to instance data.

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

fSuccess (BOOL) - returns Return codes.

On completion, the handling routine must return BOOLEAN (fSuccess).

TRUE Successful
FALSE Error

Possible Errors Detected: When an error is detected, the graphics engine calls WinSetErrorInfo to post the condition. Reasons for failure of this function include:

PMERR_HDC_BUSY
PMERR_INV_HDC

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