GreSelectPathRegion

GreSelectPathRegion merges a region representing a path into the DC region. A "path region" behaves exactly like any other region. It has no special properties relating to paths.

This function can be hooked by the presentation driver.

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

Syntax

GreSelectPathRegion(hdc, hrgn, pInstance, lFunction)

Parameters

hdc (HDC) - input: Device context handle.
hrgn (HRGN) - input: Region handle.
pInstance (PVOID) - input: Pointer to instance data.
lFunction (ULONG) - input: High-order WORD=flags; low-order WORD=NGreSelectPathRegion.

Return Code

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_DEV_FUNC_NOT_INSTALLED
PMERR_HDC_BUSY
PMERR_HRGN_BUSY
PMERR_INSUFFICIENT_MEMORY
PMERR_INV_COORDINATE
PMERR_INV_HDC
PMERR_INV_HRGN
PMERR_INV_RECT
PMERR_INV_REGION_CONTROL
PMERR_REGION_IS_CLIP_REGION

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

Declaration

#define INCL_GRE_CLIP
#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=NGreSelectPathRegion. */
BOOL     fSuccess;   /*  Return codes. */

fSuccess = GreSelectPathRegion(hdc, hrgn, pInstance, lFunction);