## Presentation Device Driver Reference for OS/2

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### GreDestroyRegion - Syntax

Simulation support:

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

Description

GreDestroyRegion deletes the specified region unless it has been selected as a clipping region. In this case, an error is raised. When a null region is specified, GreDestroyRegion does not delete any region and returns without logging an error.

This function can be hooked by the presentation driver.

    #define INCL_GRE_REGIONS

    #include <os2.h>

    HDC      hdc;        /*  Device context handle. */

    HRGN     hrgn;       /*  Region handle. */

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

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

    BOOL     fSuccess;   /*  Reurn codes. */

    fSuccess = GreDestroyRegion(hdc, hrgn, pInstance,

                 lFunction);