## Presentation Device Driver Reference for OS/2

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### GreGetPageViewport - Parameters

hdc (HDC) - input Device context handle.

prclViewport (PRECTL) - input Pointer to page viewport boundaries.

This is a RECTL structure in device coordinates:

xLeft Minimum x-coordinate of viewport
yBottom Minimum y-coordinate
xRight Maximum x-coordinate of viewport
yTop Maximum y-coordinate

Boundaries are inclusive at the bottom-left corner, and exclusive at the top-right corner.

pInstance (PVOID) - input Pointer to instance data.

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

fSuccess (BOOL) - returns Return codes.

This function returns BOOLEAN (fSuccess).

TRUE Successful
FALSE Error

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_HDC_BUSY
PMERR_INV_HDC

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