HwxALCValid (Windows Embedded CE 6.0)

1/6/2010

This function defines the set of characters that the character recognition engine can return when it converts ink, which is user-drawn input, to a text string.

Syntax

BOOL HwxALCValid( 
  HRC hrc, 
  ALC alc 
);

Parameters

• hrc
  [in] Handle to the handwriting recognition context (HRC) object.

• alc
  [in] Alphabet code (ALC) value that describes the character groupings used by the recognizer to evaluate the input handwriting. The following table shows the values this parameter can take.

  Value	Description
  ALC_WHITE	Used for a blank or white space.
  ALC_LCALPHA	Used for the lowercase alphabet, a through z.
  ALC_UCALPHA	Used for the uppercase alphabet, A through Z.
  ALC_NUMERIC	Used for the digits 0 through 9.
  ALC_PUNC	Used for the set of standard punctuation. It is language-dependent.
  ALC_NUMERIC_PUNC	Used for all non-digit characters in numbers, such as the period and the comma.
  ALC_MATH	Used for a set of math symbols, such as %, ^, *, (), _, +, {}, <, and /.
  ALC_MONETARY	Used for punctuation that appears in local monetary expressions.
  ALC_COMMON_SYMBOLS	Signifies commonly used symbols from ALC_WHITE, ALC_LCALPHA, ALC_UCALPHA, ALC_NUMERIC, ALC_PUNC, ALC_NUMERIC_PUNC, ALC_MATH, and ALC_MONETARY.
  ALC_OTHER	Signifies other punctuation that is not typically used.
  ALC_ASCII	Used for the 7-bit ASCII characters — 20 through 7F.
  ALC_HIRAGANA	Used for Hiragana characters.
  ALC_KATAKANA	Used for Katakana characters.
  ALC_KANJI_COMMON	Used for the most commonly used Kanji characters (JPN).
  ALC_KANJI_RARE	Used for the remaining Kanji characters (JPN).
  ALC_HANGUL_COMMON	Signifies the commonly used Hangul characters used in Korea.
  ALC_HANGUL_RARE	Signifies the remaining Hangul characters used in Korea.
  ALC_OEM	Specific to recognizers created by OEMs.

  ALC groupings created by combining two or more related ALC basic values are described in the following table.

  ALC groupings	Basic ALC values
  ALC_ALPHA	ALC_LCALPHA | ALC_UCALPHA
  ALC_ALPHANUMERIC	ALC_ALPHA | ALC_NUMERIC
  ALC_KANA	ALC_HIRAGANA | ALC_KATAKANA
  ALC_KANJI_ALL	ALC_KANJI_COMMON | ALC_KANJI_RARE
  ALC_HANGUL_ALL	ALC_HANGUL_COMMON | ALC_HANGUL_RARE
  ALC_EXTENDED_SYM	ALC_MATH | ALC_MONETARY | ALC_OTHER
  ALC_SYS_MINIMUM	ALC_ALPHANUMERIC | ALC_PUNC | ALC_WHITE
  ALC_SYS_DEFAULT	ALC_SYS_MINIMUM | ALC_COMMON_SYMBOLS

  The following table shows how these groupings can be combined with each other or with the basic values for various languages.

  Language ALC groupings	ALC groupings
  ALC_USA_COMMON	ALC_SYS_DEFAULT
  ALC_USA_EXTENDED	ALC_USA_COMMON | ALC_EXTENDED_SYM
  ALC_JPN_COMMON	ALC_SYS_DEFAULT | ALC_KANA | ALC_KANJI_COMMON
  ALC_JPN_EXTENDED	ALC_JPN_COMMON | ALC_EXTENDED_SYM | ALC_KANJI_RARE
  ALC_CHS_COMMON	ALC_SYS_DEFAULT | ALC_KANJI_COMMON
  ALC_CHS_EXTENDED	ALC_CHS_COMMON | ALC_EXTENDED_SYM | ALC_KANJI_RARE
  ALC_CHT_COMMON	ALC_SYS_DEFAULT | ALC_KANJI_COMMON
  ALC_CHT_EXTENDED	ALC_CHT_COMMON | ALC_EXTENDED_SYM | ALC_KANJI_RARE
  ALC_KOR_COMMON	ALC_SYS_DEFAULT | ALC_HANGUL_COMMON | ALC_KANJI_COMMON
  ALC_KOR_EXTENDED	ALC_KOR_COMMON | ALC_EXTENDED_SYM | ALC_HANGUL_RARE | ALC_KANJI_RARE

Return Value

TRUE indicates success. FALSE indicates failure. To get extended error information, call GetLastError.

Remarks

This function lets an application restrict or expand the amount of characters that the recognition engine uses when it translates user-drawn characters. For example, if an application is expecting a telephone number as input from a user, the application can call HwxALCValid to specify the ALC_NUMERIC character range. Specifying a limited character range prevents the recognition engine from interpreting a user-drawn zero as an uppercase O.

When HwxALCValid specifies multiple ALCs, an application can use the HwxALCPriority function to indicate the first ALC to use during the handwriting recognition process.

HwxALCValid fails when a specified ALC is not loaded on the device.

Requirements

See Also

Reference

HwxALCPriority

Other Resources

Handwriting Recognizer Engine (HWX) Functions