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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: a z.
| ALC_UCALPHA
| Uppercase letters: AZ.
| ALC_NUMERIC
| Numerals: 09.
| 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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