View source for GreSelectBitmap

GreSelectBitmap selects a bit map into a memory DC or (if called with a NULL bit-map handle) deselects the existing bit map from the DC.

This function is supported by the graphics engine.

== Syntax == 
 GreSelectBitmap(hdc, hbm, pInstance, lFunction)

== Parameters ==
;hdc (HDC) - input:Device context handle.
;hbm (HBITMAP) - input:Bit-map handle.
;pInstance (PVOID) - input:Pointer to instance data.
;lFunction (ULONG) - input:High-order WORD=flags; low-order WORD=NGreSelectBitmap.

== Returns ==
;rc (HBITMAP) - returns:On completion, this function returns an HBITMAP value:
:*HBM_ERROR Error
:*Null Successful
:*Other Handle of deselected bit map
:An error is raised when the bit map:
*Is incompatible with the DC and cannot be converted
*Is already selected into a DC
*Has been assigned a Set ID for use as a pattern in an area fill operation
:Possible Errors Detected: Error codes posted by the graphics engine for this function include:
:*PMERR_BITMAP_IS_SELECTED
:*PMERR_DEV_FUNC_NOT_INSTALLED
:*PMERR_HBITMAP_BUSY
:*PMERR_HDC_BUSY
:*PMERR_INSUFFICIENT_MEMORY
:*PMERR_INV_BITMAP_DIMENSION
:*PMERR_INV_COORDINATE
:*PMERR_INV_HBITMAP
:*PMERR_INV_HDC
:*PMERR_INV_HRGN
:*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.

== Sample ==
<pre>
#define INCL_GRE_DEVSUPPORT
#include <os2.h>

HDC        hdc;        /*  Device context handle. */
HBITMAP    hbm;        /*  Bit-map handle. */
PVOID      pInstance;  /*  Pointer to instance data. */
ULONG      lFunction;  /*  High-order WORD=flags; low-order WORD=NGreSelectBitmap. */
HBITMAP    rc;         /*  On completion, this function returns an HBITMAP value: */

rc = GreSelectBitmap(hdc, hbm, pInstance, lFunction);
</pre>

== Remarks ==
If GreSelectBitmap is called to deselect a bit map, the return code is the handle of the deselected bit map.

When created, a bit map has to be selected into a DC before the presentation driver can write to it. A bit map can be selected into the DC that created it or into any DC that has a compatible bit-map format. Compatibility can be ensured by using one of the standard formats. Note that the presentation driver must select a bit map into a device context before attempting to draw it.

[[Category:Gre]]