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GetCharABCWidths info  Overview  Group

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 of device context

    UINT uFirstChar,

// first character in range to query

    UINT uLastChar,

// last character in range to query

    LPABC lpabc 

// address of character-width structure

   );

Parameters

hdc
Identifies the device context.
uFirstChar
Specifies the first character in the group of consecutive characters from the current font.
uLastChar
Specifies the last character in the group of consecutive characters from the current font.
lpabc
Points to an array of ABC structures that receive the character widths when the function returns. This array must contain at least as many ABC structures as there are characters in the range specified by the uFirstChar and uLastChar parameters.

Return Values

If the function succeeds, the return value is nonzero

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks

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.

See Also

GetCharWidth, GetOutlineTextMetrics, OUTLINETEXTMETRIC, ABC

See:


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