DdfSetFontStyle
This function specifies a text font style in the DDF buffer.
Syntax
DdfSetFontStyle(hddf, fFontStyle)
Parameters
- hddf (HDDF) - input
- Handle to DDF returned by DdfInitialize.
- fFontStyle (ULONG) - input
- Font style flag. A NULL value for this parameter will set the font style back to the default. Any of the following values can be specified:
- FM_SEL_ITALIC
- FM_SEL_BOLD
- FM_SEL_UNDERSCORE
- These values can be ORed together to combine different font styles.
Returns
- rc (BOOL) - returns
- Success indicator.
- TRUE Successful completion
- FALSE Error occurred
Remarks
There is a 4-byte ESC code overhead in the DDF internal buffer for the `fFontStyle` parameter.
Possible errors include:
- HMERR_DDF_MEMORY (0x3001) Not enough memory is available.
- HMERR_DDF_FONTSTYLE (0x3005) The font style is not valid.
Example Code
Declaration:
#define INCL_DDF #include <os2.h> HDDF hddf; /* Handle to DDF returned by DdfInitialize. */ ULONG fFontStyle; /* Font style flag. */ BOOL rc; /* Success indicator. */ rc = DdfSetFontStyle(hddf, fFontStyle);
After initializing a DDF buffer with DdfInitialize, this example uses `DdfPara` to start a new paragraph, `DdfSetFont` and `DdfSetFontStyle` to display text in a large, bold Courier font, `DdfSetColor` to change the text color, and `DdfText` to place text in the buffer.
For a more detailed example and discussion of initializing DDF, see the DdfInitialize sample.
#define INCL_WINWINDOWMGR /* General window management */
#define INCL_WINMESSAGEMGR /* Message management */
#define INCL_DDF /* Dynamic Data Facility */
#include <os2.h>
#include <pmhelp.h>
MRESULT WindowProc(HWND hwnd, ULONG ulMsg, MPARAM mp1, MPARAM mp2)
{
HWND hwndParent;
HWND hwndInstance; /* help instance window */
HDDF hDdf; /* DDF handle */
switch (ulMsg)
{
case HM_QUERY_DDF_DATA:
/* get the help instance */
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;
}
/* create paragraph in DDF buffer */
if (!DdfPara(hDdf))
{
return (MRESULT)FALSE;
}
/* Change to large (100 x 100 dimensions) Courier font */
if (!DdfSetFont(hDdf, "Courier", 100L, 100L))
{
return (MRESULT)FALSE;
}
/* make the font BOLDFACE */
if (!DdfSetFontStyle(hDdf, FM_SEL_BOLD))
{
return (MRESULT)FALSE;
}
/* make the text display as BLUE on a PALE GRAY background */
if (!DdfSetColor(hDdf, CLR_PALEGRAY, CLR_BLUE))
{
return (MRESULT)FALSE;
}
/* Write data into the buffer */
if (!DdfText(hDdf, "Sample Text"))
{
return (MRESULT)FALSE;
}
return (MRESULT)hDdf;
}
return WinDefWindowProc(hwnd, ulMsg, mp1, mp2);
}