Advanced MFC Programming

Chapter 7. Common Dialog Boxes
DWORD lStructSize;
HWND hwndOwner;
HDC hDC;
LPLOGFONT lpLogFont;
INT iPointSize;
DWORD Flags;
DWORD rgbColors;
LPARAM lCustData;
LPCFHOOKPROC lpfnHook;
LPCTSTR lpTemplateName;
HINSTANCE hInstance;
LPTSTR lpszStyle;
WORD nFontType;
WORD ___MISSING_ALIGNMENT__;
INT nSizeMin;
INT nSizeMax;
} CHOOSEFONT;
There are several things that can be customized here. First, we can change the default font size range.
By default, a valid size for all fonts is ranged from 8 to 72. We can set a narrower range by setting
CF_LIMITSIZE bit of member Flags and assigning lower and higher boundaries to members nSizeMin and
nSizeMax respectively. We can also specify font’s initial color by setting CF_EFFECTS bit of member Flags
and assigning a COLORREF value to member rgbColors (the initial color must be one of the standard colors
defined in the font dialog box such as red, green, cyan, black...).
Structure LOGFONT
Also, we can specify an initially selected font (with specified size and styles) by assigning a LOGFONT
type pointer to member lpLogFont. Here, structure LOGFONT is used to describe a font:
typedef struct tagLOGFONT {
LONG lfHeight;
LONG lfWidth;
LONG lfEscapement;
LONG lfOrientation;
LONG lfWeight;
BYTE lfItalic;
BYTE lfUnderline;
BYTE lfStrikeOut;
BYTE lfCharSet;
BYTE lfOutPrecision;
BYTE lfClipPrecision;
BYTE lfQuality;
BYTE lfPitchAndFamily;
CHAR lfFaceName[LF_FACESIZE];
} LOGFONT;
A font has many properties. The most important ones are face name, height, and font styles (italic,
bolded, underlined or strikeout). In structure LOGFONT, these styles are represented by the following
members: lfFaceName, lfWeight, lfItalic, lfUnderline and lfStrikeOut. A face name is the name of
the font, it distinguishes one font from another. Every font has its own face name, such as “Arial”,
“System” and “MS Serif”. The weight of a font specifies how font is emphasized, its range is from 0 to
1000. Usually we use predefined values such as FW_BOLD (font is bolded) and FW_NORMAL (font is not
bolded) for convenience. Member lfItalic, lfUnderline and lfStrikeOut are all Boolean type, by
setting them to TRUE, we can let the font to become italic, underlined, or strikeout. Member nSizeMin and
nSizeMax can be used to restrict the size of a font.
In order to use LOGFONT object to initialize a font dialog box, we must first set
CF_INITTOLOGFONTSTRUCT bit for member Flags of structure CHOOSEFONT, then assign the LOGFONT type
pointer to member lpLogFont.
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