DdfBitmap
This function places a reference to a bitmap in the DDF buffer.
Syntax
DdfBitmap(hddf, hbm, fAlign)
Parameters
- hddf (HDDF) - input
- Handle to DDF returned by DdfInitialize.
- hbm (HBITMAP) - input
- Standard Presentation Manager bitmap handle.
- fAlign (ULONG) - input
- Text justification flag.
- Any of the following values can be specified:
- ART_LEFT: Left-justify the bitmap.
- ART_RIGHT: Right-justify the bitmap.
- ART_CENTER: Center the bitmap.
- ART_RUNIN: Allow the bitmap to be reflowed with text.
Returns
- rc (BOOL) - returns
- Success indicator.
- TRUE indicates successful completion.
- FALSE indicates an error occurred.
Remarks
The handle to the presentation space in which the bitmap was created cannot be freed by the application while the panel is displayed.
Note: There is a (3-byte + size of HBITMAP structure) ESC code overhead in the DDF internal buffer for this function. There is a 1-byte ESC code overhead required for the fAlign flag.
Errors
Possible returns from WinGetLastError:
- HMERR_DDF_MEMORY (0x3001): Not enough memory is available.
- HMERR_DDF_ALIGN_TYPE (0x3002): The alignment type is not valid.
Example Code
This example uses DdfBitmap to place a reference to a bitmap in the DDF buffer after initializing a DDF buffer with DdfInitialize.
#define INCL_WINWINDOWMGR /* General window management */
#define INCL_WINMESSAGEMGR /* Message management */
#define INCL_GPICONTROL /* Basic PS control */
#define INCL_GPIBITMAPS /* Bitmaps and Pel Operations */
#define INCL_GPIPRIMITIVES /* Drawing Primitives/Attributes */
#define INCL_DDF /* Dynamic Data Facility */
#include <os2.h>
#include <pmhelp.h>
#define ACVP_HAB 12
#define BM_HPS 16
#define BM_HDC 20
#define BM_HWND 24
#define ID_LEFT 255
MRESULT WindowProc( HWND hwnd, ULONG ulMsg, MPARAM mp1, MPARAM mp2 )
{
HWND hwndParent; /* parent window */
HWND hwndInstance; /* help instance window */
HDDF hDdf; /* DDF handle */
HDC hdc; /* device context handle */
HPS hps; /* presentation space handle */
HAB hab; /* anchor block handle */
SIZEL sizel = {0L,0L};/* size of new PS */
HBITMAP hBitmap; /* bitmap handle */
HMODULE hModule; /* module handle */
switch( ulMsg )
{
case HM_QUERY_DDF_DATA:
hwndParent = WinQueryWindow( hwnd, QW_PARENT );
hwndParent = WinQueryWindow( hwndParent, QW_PARENT );
hwndInstance = (HWND)WinSendMsg( hwndParent, HM_QUERY,
MPFROMSHORT( HMQW_INSTANCE ), NULL );
/* Allocate 1K Buffer (default) */
hDdf = DdfInitialize(
hwndInstance, /* Handle of help instance */
0L, /* Default buffer size */
0L /* Default increment */
);
if (hDdf == NULLHANDLE) /* Check return code */
{
return (MRESULT)FALSE;
}
/* get module handle for bitmap */
DosQueryModuleHandle("bitmap", &hModule);
if (hModule == NULLHANDLE)
{
return (MRESULT)FALSE;
}
/* get hab for this window */
if ((hab = (HAB)WinQueryWindowULong(hwnd, ACVP_HAB)) == NULLHANDLE)
{
return (MRESULT)FALSE;
}
/* create a device context */
if ((hdc = DevOpenDC(hab, OD_MEMORY, "*", 0L,
(PDEVOPENDATA)NULL, (HDC)NULL)) == NULLHANDLE)
{
return (MRESULT)FALSE;
}
/* save hdc in reserved word */
WinSetWindowULong(hwnd, BM_HDC, (ULONG)hdc);
/* create a noncached micro presentation space */
/* and associate it with the window */
if ((hps = GpiCreatePS(hab, hdc, &sizel,
PU_PELS | GPIF_DEFAULT
| GPIT_MICRO | GPIA_ASSOC)) == NULLHANDLE)
{
return (MRESULT)FALSE;
}
/* save hps in reserved word */
WinSetWindowULong(hwnd, BM_HPS, (ULONG)hps);
/* Load the Bitmap to display */
if ((hBitmap = GpiLoadBitmap(hps, hModule, ID_LEFT, 300L,
300L)) == NULLHANDLE)
{
return (MRESULT)FALSE;
}
/* save bitmap hwnd in reserved word */
WinSetWindowULong(hwnd, BM_HWND, (ULONG)hBitmap);
/* Display the bitmap align left */
if (!DdfBitmap(hDdf, hBitmap, ART_LEFT))
{
return (MRESULT)FALSE;
}
return (MRESULT)hDdf;
case WM_CLOSE:
/* release PS, DC, and bitmap */
GpiDestroyPS((HPS)WinQueryWindowULong(hwnd, BM_HPS));
DevCloseDC((HDC)WinQueryWindowULong(hwnd, BM_HDC));
GpiDeleteBitmap((HBITMAP)WinQueryWindowULong(hwnd, BM_HWND));
WinDestroyWindow(WinQueryWindow(hwnd, QW_PARENT));
return (MRESULT)TRUE;
}
}