Windows API Guide: CCHookProc Callback Function

Declare Function CreateFont Lib "gdi32.dll" Alias "CreateFontA" (ByVal nHeight As Long, ByVal nWidth As Long, ByVal nEscapement As Long, ByVal nOrientation As Long, ByVal fnWeight As Long, ByVal fdwItalic As Long, ByVal fdwUnderline As Long, ByVal fdwStrikeOut As Long, ByVal fdwCharSet As Long, ByVal fdwOutputPrecision As Long, ByVal fdwClipPrecision As Long, ByVal fdwQuality As Long, ByVal fdwPitchAndFamily As Long, ByVal lpszFace As String) As Long

Platforms

Windows 95: Supported.
Windows 98: Supported.
Windows NT: Requires Windows NT 3.1 or later.
Windows 2000: Supported.
Windows CE: Not Supported.

Description & Usage

CreateFont creates a font object, which allows a font with given attributes to be used to draw text on a device. The font created by the function is the one which most closely matches the attributes of the logical font information passed via the numerous parameters. After your program is finished using the font, it must be deleted by using DeleteObject.

Return Value

If an error occured, the function returns 0 (Windows NT, 2000: use GetLastError to get the error code). If successful, the function returns a handle to the font just created.

Visual Basic-Specific Issues

None.

Parameters

nHeight

The height of the font's character cell, in logical units (also known as the em height). If positive, the font mapper converts this value directly into device units and matches it with the cell height of the possible fonts. If 0, the font mapper uses a default character height. If negative, the font mapper converts the absolute value into device units and matches it with the character height of the possible fonts.

nWidth

The average width of the font's characters. If 0, the font mapper tries to determine the best value.

nEscapement

The angle between the font's baseline and escapement vectors, in units of ¹/₁₀ degrees. Windows 95, 98: This must be equal to lfOrientation.

nOrientation

The angle between the font's baseline and the device's x-axis, in units of ¹/₁₀ degrees. Windows 95, 98: This must be equal to lfEscapement.

fnWeight

One of the following flags specifying the boldness (weight) of the font:

FW_DONTCARE: Default weight.
FW_THIN: Thin weight.
FW_EXTRALIGHT: Extra-light weight.
FW_ULTRALIGHT: Same as FW_EXTRALIGHT.
FW_LIGHT: Light weight.
FW_NORMAL: Normal weight.
FW_REGULAR: Same as FW_NORMAL.
FW_MEDIUM: Medium weight.
FW_SEMIBOLD: Semi-bold weight.
FW_DEMIBOLD: Same As FW_SEMIBOLD.
FW_BOLD: Bold weight.
FW_EXTRABOLD: Extra-bold weight.
FW_ULTRABOLD: Same as FW_EXTRABOLD.
FW_HEAVY: Heavy weight.
FW_BLACK: Same as FW_HEAVY.

fdwItalic

A non-zero value if the font is italicized, 0 if not.

fdwUnderline

A non-zero value if the font is underlined, 0 if not.

fdwStrikeOut

A non-zero value if the font is striked out, 0 if not.

fdwCharSet

Exactly one of the following flags specifying the character set of the font:

ANSI_CHARSET: ANSI character set.
ARABIC_CHARSET: Windows NT, 2000: Arabic character set.
BALTIC_CHARSET: Windows 95, 98: Baltic character set.
CHINESEBIG5_CHARSET: Chinese Big 5 character set.
DEFAULT_CHARSET: Default character set.
EASTEUROPE_CHARSET: Windows 95, 98: Eastern European character set.
GB2312_CHARSET: GB2312 character set.
GREEK_CHARSET: Windows 95, 98: Greek character set.
HANGEUL_CHARSET: HANDEUL character set.
HEBREW_CHARSET: Windows NT, 2000: Hebrew character set.
JOHAB_CHARSET: Windows 95, 98: Johab character set.
MAC_CHARSET: Windows 95, 98: Mac character set.
OEM_CHARSET: Original equipment manufacturer (OEM) character set.
RUSSIAN_CHARSET: Windows 95, 98: Russian character set.
SHIFTJIS_CHARSET: ShiftJis character set.
SYMBOL_CHARSET: Symbol character set.
THAI_CHARSET: Windows NT, 2000: Thai character set.
TURKISH_CHARSET: Windows 95, 98: Turkish character set.

fdwOutPrecision

Exactly one of the following flags specifying the desired precision (closeness of the match) between the logical font ideally described by the structure and the actual logical font. This value is used by the font mapper to produce the logical font.

OUT_DEFAULT_PRECIS: The default font mapping behavior.
OUT_DEVICE_PRECIS: Choose a device font if there are multiple fonts in the system with the same name.
OUT_OUTLINE_PRECIS: Windows NT, 2000: Choose a TrueType or other outline-based font.
OUT_RASTER_PRECIS: Choose a raster font if there are multiple fonts in the system with the same name.
OUT_STRING_PRECIS: Raster font (used for enumeration only).
OUT_STROKE_PRECIS: Windows 95, 98: Vector font (used for enumeration only). Windows NT, 2000: TrueType, outline-based, or vector font (used for enumeration only).
OUT_TT_ONLY_PRECIS: Choose only a TrueType font.
OUT_TT_PRECIS: Choose a TrueType font if there are multiple fonts in the system with the same name.

fdwClipPrecision

Exactly one of the following flags specifying the clipping precision to use when the font's characters must be clipped:

CLIP_DEFAULT_PRECIS: The default clipping behavior.
CLIP_EMBEDDED: This flag must be set for an embedded read-only font.
CLIP_LH_ANGLES: The direction of any rotations is determined by the coordinate system (or else all rotations are counterclockwise).
CLIP_STROKE_PRECIS: Raster, vector, or TrueType font (used for enumeration only).

fdwQuality

Exactly one of the following flags specifying the output quality of the logical font as compared to the ideal font:

ANTIALIASED_QUALITY: Windows 95, 98, NT 4.0 or later, 2000: The font is always antialiased if possible.
DEFAULT_QUALITY: The default quality: the appearance of the font does not matter.
DRAFT_QUALITY: The appearance of the font is less important then in PROOF_QUALITY.
NONANTIALIASED_QUALITY: Windows 95, 98, NT 4.0 or later, 2000: The font is never antialiased.
PROOF_QUALITY: The quality of the appearance of the font is more important than exactly matching the specified font attributes.

fdwPitchAndFamily

A bitwise OR combination of exactly one *_PITCH flag specifying the pitch of the font and exactly one FF_* flag specifying the font face family of the font:

DEFAULT_PITCH: The default pitch.
FIXED_PITCH: Fixed pitch.
VARIABLE_PITCH: Variable pitch.
FF_DECORATIVE: Showy, decorative font face.
FF_DONTCARE: Do not care about the font face.
FF_MODERN: Modern font face (monospaced, sans serif font).
FF_ROMAN: Roman font face (proportional-width, serif font).
FF_SCRIPT: Script font face which imitates script handwriting.
FF_SWISS: Swiss font face (proportional-width, sans serif font).

lpszFace

The name of the font face to use.

Constant Definitions

Const FW_DONTCARE = 0 Const FW_THIN = 100 Const FW_EXTRALIGHT = 200 Const FW_ULTRALIGHT = 200 Const FW_LIGHT = 300 Const FW_NORMAL = 400 Const FW_REGULAR = 400 Const FW_MEDIUM = 500 Const FW_SEMIBOLD = 600 Const FW_DEMIBOLD = 600 Const FW_BOLD = 700 Const FW_EXTRABOLD = 800 Const FW_ULTRABOLD = 800 Const FW_HEAVY = 900 Const FW_BLACK = 900 Const ANSI_CHARSET = 0 Const ARABIC_CHARSET = 178 Const BALTIC_CHARSET = 186 Const CHINESEBIG5_CHARSET = 136 Const DEFAULT_CHARSET = 1 Const EASTEUROPE_CHARSET = 238 Const GB2312_CHARSET = 134 Const GREEK_CHARSET = 161 Const HANGEUL_CHARSET = 129 Const HEBREW_CHARSET = 177 Const JOHAB_CHARSET = 130 Const MAC_CHARSET = 77 Const OEM_CHARSET = 255 Const RUSSIAN_CHARSET = 204 Const SHIFTJIS_CHARSET = 128 Const SYMBOL_CHARSET = 2 Const THAI_CHARSET = 222 Const TURKISH_CHARSET = 162 Const OUT_DEFAULT_PRECIS = 0 Const OUT_DEVICE_PRECIS = 5 Const OUT_OUTLINE_PRECIS = 8 Const OUT_RASTER_PRECIS = 6 Const OUT_STRING_PRECIS = 1 Const OUT_STROKE_PRECIS = 3 Const OUT_TT_ONLY_PRECIS = 7 Const OUT_TT_PRECIS = 4 Const CLIP_DEFAULT_PRECIS = 0 Const CLIP_EMBEDDED = 128 Const CLIP_LH_ANGLES = 16 Const CLIP_STROKE_PRECIS = 2 Const ANTIALIASED_QUALITY = 4 Const DEFAULT_QUALITY = 0 Const DRAFT_QUALITY = 1 Const NONANTIALIASED_QUALITY = 3 Const PROOF_QUALITY = 2 Const DEFAULT_PITCH = 0 Const FIXED_PITCH = 1 Const VARIABLE_PITCH = 2 Const FF_DECORATIVE = 80 Const FF_DONTCARE = 0 Const FF_ROMAN = 16 Const FF_SCRIPT = 64 Const FF_SWISS = 32

Example

' This code is licensed according to the terms and conditions listed here. ' Draw the alphabet in the upper-left corner of window Form1 using ' the goofy Symbol font. Dim hFont As Long  ' handle to the Symbol font which is created Dim hOldFont As Long  ' handle to the font previously selected by Form1 Dim retval As Long  ' return value ' Create a font object using the Symbol font.  Only apply boldface ' formatting to the font -- use defaults for most other settings. hFont = CreateFont(0, 0, 0, 0, FW_BOLD, 0, 0, 0, SYMBOL_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH Or FF_DECORATIVE, "Symbol") ' Select that font for use with Form1, saving the previous selection. hOldFont = SelectObject(Form1.hDC, hFont) ' Draw the alphabet near the upper-left corner. retval = TextOut(Form1.hDC, 10, 10, "ABCDEFGHIJKLMNOPQRSTUVWXYZ", 26) ' Select the previous font back. retval = SelectObject(Form1.hDC, hOldFont) ' Delete the font we created to free up resources. retval = DeleteObject(hFont)