GreSaveXformData

GreSaveXformData stores the current transform state in pBuffer.

This function can be hooked by the presentation driver.

Simulation support

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

Syntax

GreSaveXformData(hdc, ulSize, pInstance, lFunction)

Parameters

hdc (HDC) - input

Device context handle.

ulSize (ULONG) - input

Size in bytes required for pBuffer.

Can be specified as 0. In this case, the function returns the size of the transform data:

ulSize=GreSaveXformData (hdc, 0, 0);     /* Find out how large the buffer must be, */
GreSaveXformData (hdc, ulSize, pBuffer); /* then save the transform state.         */

pInstance (PVOID) - input

Pointer to instance data.

lFunction (ULONG) - input

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

Return Code

rc (ULONG) - returns

Return codes.

When called with ulSize specified as 0, it returns the size of the buffer required to save the transform state. Otherwise, it returns GPI_OK to indicate a successful completion. In either case, GPI_ERROR is returned to indicate failure.

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_HDC_BUSY
• PMERR_INV_HDC
• PMERR_INV_LENGTH_OR_COUNT

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

Declaration

#define INCL_GRE_XFORMS
#include <os2.h>

HDC      hdc;        /*  Device context handle. */
ULONG    ulSize;     /*  Size in bytes required for pBuffer. */
PVOID    pInstance;  /*  Pointer to instance data. */
ULONG    lFunction;  /*  High-order WORD=flags; low-order WORD=NGreSaveXformData. */
ULONG    rc;         /*  Return codes. */

rc = GreSaveXformData(hdc, ulSize, pInstance, lFunction);