Alphabet

The SetAlphabetHRC function specifies a set of symbols the HRC should expect in the input. (A similar function, SetBoxAlphabetHRC, provides the same service for a group of boxes when the HRC uses guides.) For example, the application can constrain recognition to numerals and uppercase letters, as shown here:

iRet = SetAlphabetHRC( hrc1, ALC_NUMERIC | ALC_UCALPHA, NULL );

For more details about SetAlphabetHRC and SetBoxAlphabetHRC, see Chapter 10, "Pen Application Programming Interface Functions."

The first argument of SetAlphabetHRC is the HRC handle returned by CreateCompatibleHRC. The second argument is a bitwise-OR value formed by the desired combination of ALC_ constants, some of which are listed here:

Alphabet constant
Description
ALC_DEFAULT
Default alphabet value for recognizer. If recognizer can serve as a system recognizer, its default alphabet must include at least the ALC_SYSMINIMUM set. The Pen API does not specify a default for nonsystem recognizers.
ALC_LCALPHA
Lowercase letters: apics/PENAPI00090000.gifz.
ALC_UCALPHA
Uppercase letters: Apics/PENAPI00090000.gifZ.
ALC_NUMERIC
Numerals: 0pics/PENAPI00090000.gif9.
ALC_ALPHANUMERIC
Combines ALC_LCALPHA, ALC_UCALPHA, and ALC_NUMERIC.
ALC_PUNC
Punctuation: !-;`"?()&.,;\.
ALC_MATH
Math symbols: %^*()-+={}<>,/.
ALC_MONETARY
Monetary symbols: ,.$ (or as determined by language).
ALC_OTHER
Other special characters: @#|_~[].
ALC_ASCII
Seven-bit characters ASCII #20 to ASCII #127.
ALC_WHITE
White space such as tabs and newline and space characters.
ALC_NONPRINT
TAB, ENTER, and CTRL keys.
ALC_SYSMINIMUM
Combines ALC_ALPHANUMERIC, ALC_PUNC, ALC_WHITE, and ALC_GESTURE.

If an application does not specify alphabet configuration either through an existing HRC model or by calling SetAlphabetHRC or SetBoxAlphabetHRC, Windows assumes ALC_SYSMINIMUM as the default alphabet configuration. For a complete list of ALC_ values, see Chapter 13, "Pen Application Programming Interface Constants."

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