## Presentation Device Driver Reference for OS/2

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### GreGetPageViewport - Syntax

Simulation support:

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

Description

GreGetPageViewport loads the buffer indicated by prclViewport with the page viewport coordinates.

This function can be hooked by the presentation driver.

    #define INCL_GRE_XFORMS

    #include <os2.h>

    HDC       hdc;           /*  Device context handle. */

    PRECTL    prclViewport;  /*  Pointer to page viewport boundaries. */

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

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

    BOOL      fSuccess;      /*  Return codes. */

    fSuccess = GreGetPageViewport(hdc, prclViewport,

                 pInstance, lFunction);