The GetCharABCWidths function retrieves the widths, in logical units, of consecutive characters in a given range from the current TrueType font. This function succeeds only with TrueType fonts.
BOOL GetCharABCWidths(
HDC hdc, // handle to device context
UINT uFirstChar, // first character in range to query
UINT uLastChar, // last character in range to query
LPABC lpabc // pointer to character-width structure
);
If the function succeeds, the return value is nonzero
If the function fails, the return value is zero.
Windows NT: To get extended error information, call GetLastError.
The TrueType rasterizer provides ABC character spacing after a specific point size has been selected. "A" spacing is the distance added to the current position before placing the glyph. "B" spacing is the width of the black part of the glyph. "C" spacing is the distance added to the current position to provide white space to the right of the glyph. The total advanced width is given by A+B+C.
When the GetCharABCWidths function retrieves negative "A" or "C" widths for a character, that character includes underhangs or overhangs.
To convert the ABC widths to font design units, an application should use the value stored in the otmEMSquare member of a OUTLINETEXTMETRIC structure. This value can be retrieved by calling the GetOutlineTextMetrics function.
The ABC widths of the default character are used for characters outside the range of the currently selected font.
To retrieve the widths of characters in non-TrueType fonts, applications should use the GetCharWidth function.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in wingdi.h.
Import Library: Use gdi32.lib.
Unicode: Implemented as Unicode and ANSI versions on Windows NT.
Fonts and Text Overview, Font and Text Functions, GetCharWidth, GetOutlineTextMetrics, OUTLINETEXTMETRIC, ABC