## Presentation Device Driver Reference for OS/2

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### GreGetPageUnits

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    Syntax
    Parameters
    Returns
    Glossary

Simulation support:

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

Description

GreGetPageUnits returns the page units for the specified display context. On completion, the structure addressed by pExtent contains the dimensions of the page expressed in the units indicated by the return value of this function.

This function can be hooked by the presentation driver.

    #define INCL_GRE_XFORMS

    #include <os2.h>

    HDC       hdc;        /*  Device context handle. */

    PSIZEL    pExtent;    /*  Pointer to a SIZEL structure where the page dimensions are returned. */

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

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

    ULONG     rc;         /*  Return codes. */

    rc = GreGetPageUnits(hdc, pExtent, pInstance,

           lFunction);