GreResetDC

GreResetDC restores a device context to its created state.

This function is supported by the graphics engine.

Syntax

GreResetDC(hdc, flOptions, pInstance, lFunction);

Parameters

hdc (HDC) - input

Device context handle.

flOptions (ULONG) - input

Option flags.

Valid flags are:

RDC_SETOWNERTOSHELL

When set, the graphics engine sets the ownership of the reset DC to the process that first initialized the engine, (normally the Presentation Manager interface).

RDC_RGBMODE

Sets the DC's logical color table to RGB mode.

pInstance (PVOID) - input

Pointer to instance data.

lFunction (ULONG) - input

High-order WORD=flags; low-order WORD=NGreResetDC.

Return Code

fSuccess (BOOL) - returns

Return codes.

On completion, the handling routine must return BOOLEAN (fSuccess).

• TRUE Successful
• FALSE Error

Possible Errors Detected: When an error is detected, the graphics engine calls WinSetErrorInfo to post the condition. Reasons for failure of this function include:

• PMERR_BASE_ERROR
• PMERR_BITMAP_IS_SELECTED
• PMERR_DEV_FUNC_NOT_INSTALLED
• PMERR_EXCEEDS_MAX_SEG_LENGTH
• PMERR_HBITMAP_BUSY
• PMERR_HDC_BUSY
• PMERR_INSUFFICIENT_MEMORY
• PMERR_INV_BITMAP_DIMENSION
• PMERR_INV_CODEPAGE
• PMERR_INV_COORDINATE
• PMERR_INV_DC_TYPE
• PMERR_INV_HBITMAP
• PMERR_INV_HDC
• PMERR_INV_HRGN
• PMERR_INV_ID
• PMERR_INV_IN_AREA
• PMERR_INV_IN_PATH
• PMERR_INV_INFO_TABLE
• PMERR_INV_LENGTH_OR_COUNT
• PMERR_INV_RECT
• PMERR_INV_REGION_CONTROL
• PMERR_INV_SCAN_START

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

Remarks

All objects, such as fonts, patterns, and paths, are deleted. All attributes are set to their defaults. Any clip region selected into the DC is deleted.

This function does not alter Window Manager information stored in the DC instance data. Window Manager information includes:

• The visible region
• The DC origin
• User bounds
• Cached clipping rectangles
• The HDC_IS_DIRTY flag

Sample Code

#define INCL_GRE_DCS
#include <os2.h>

HDC      hdc;        /*  Device context handle. */
ULONG    flOptions;  /*  Option flags. */
PVOID    pInstance;  /*  Pointer to instance data. */
ULONG    lFunction;  /*  High-order WORD=flags; low-order WORD=NGreResetDC. */
BOOL     fSuccess;   /*  Return codes. */

fSuccess = GreResetDC(hdc, flOptions, pInstance,
             lFunction);