## Presentation Device Driver Reference for OS/2

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### GreGetViewingLimits - Syntax

Simulation support:

This function is simulated by a handling routine in the graphics engine.

Description

GreGetViewingLimits loads the array indicated by prclViewingLimits with the boundaries of the viewing window in graphic model-space coordinates. All boundaries are inclusive.

This function can be hooked by the presentation driver.

    #define INCL_GRE_XFORMS

    #include <os2.h>

    HDC       hdc;                /*  Device context handle. */

    PRECTL    prclViewingLimits;  /*  Pointer to limits of viewing area (RECTL structure): */

    PVOID     pInstance;          /*  Pointer to instance data. */

    ULONG     lFunction;          /*  High-order WORD=flags; low-order WORD=NGreGetViewingLimits. */

    BOOL      fSuccess;           /*  Return codes. */

    fSuccess = GreGetViewingLimits(hdc, prclViewingLimits,

                 pInstance, lFunction);