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GetStringType

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This function returns character-type information for the characters in the specified source string. For each character in the string, the function sets one or more bits in the corresponding 16-bit element of the output array. Each bit identifies a given character type, such as whether the character is a letter, a digit, or neither.

BOOL GetStringType (
DWORD dwInfoType, 
LPCWSTR lpSrcStr, 
int cchSrc, 
LPWORD lpCharType );

Parameters

  • dwInfoType
    [in] Specifies the type of character information the user wants to retrieve. The various types are divided into different levels (see the following Remarks section for a list of the information included in each type). This parameter can specify one of the following character type flags:

    Value Description
    CT_CTYPE1 Retrieve character type information.
    CT_CTYPE2 Retrieve bidirectional layout information.
    CT_CTYPE3 Retrieve text processing information.

  • lpSrcStr
    [in] Pointer to the string for which character types are requested. If cchSrc is –1, the string is assumed to be null terminated. This must be a Unicode string.

  • cchSrc
    [in] Specifies the size, in characters, of the string pointed to by the lpSrcStr parameter. If this count includes a terminating null character, the function returns character type information for the terminating null character. If this value is –1, the string is assumed to be null terminated and the length is calculated automatically.

  • lpCharType
    [out] Pointer to an array of 16-bit values. The length of this array must be large enough to receive one 16-bit value for the number of characters specified in the cchSrc parameter. When the function returns, this array contains one word corresponding to each Unicode character in the source string.

Return Values

Nonzero indicates success. Zero indicates failure. To get extended error information, call GetLastError. Possible values for GetLastError include the following:

  • ERROR_INVALID_FLAGS
  • ERROR_INVALID_PARAMETER

Remarks

The GetStringType function is designed for Unicode strings only. In the Microsoft Platform SDK, this function is named GetStringTypeW to distinguish it from the similar ANSI-string function, GetStringTypeA. Because Windows CE only supports Unicode, it requires only the single GetStringType function.

The lpSrcStr and lpCharType pointers must not be the same. If they are the same, the function fails and GetLastError returns ERROR_INVALID_PARAMETER.

The character-type bits are divided into several levels. The information for one level can be retrieved by a single call to this function. Each level is limited to 16 bits of information so that the other mapping routines, which are limited to 16 bits of representation per character, can also return character-type information.

The character types supported by this function include the following.

  • Ctype 1
    These types support ANSI C and POSIX (LC_CTYPE) character-typing functions. A combination of these values is returned in the array pointed to by the lpCharType parameter when the dwInfoType parameter is set to CT_CTYPE1.

    Name Value Description
    C1_UPPER 0x0001 Uppercase
    C1_LOWER 0x0002 Lowercase
    C1_DIGIT 0x0004 Decimal digits
    C1_SPACE 0x0008 Space characters
    C1_PUNCT 0x0010 Punctuation
    C1_CNTRL 0x0020 Control characters
    C1_BLANK 0x0040 Blank characters
    C1_XDIGIT 0x0080 Hexadecimal digits
    C1_ALPHA 0x0100 Any linguistic character: alphabetic, syllabary, or ideographic

    The following character types are either constant or computable from basic types and do not need to be supported by this function.

    Type Description
    Alphanumeric Alphabetic characters and digits (C1_ALPHA and C1_DIGIT)
    Printable Graphic characters and blanks (all C1_* types except C1_CNTRL)

  • Ctype 2
    These types support proper layout of Unicode text. The direction attributes are assigned so that the bidirectional layout algorithm standardized by Unicode produces accurate results. These types are mutually exclusive. For more information about the use of these attributes, see The Unicode Standard: Worldwide Character Encoding, Volumes 1 and 2, Addison Wesley Publishing Company: 1991, 1992, ISBN 0201567881.

    Name Value Description
    Strong   
    C2_LEFTTORIGHT 0x0001 Left to right
    C2_RIGHTTOLEFT 0x0002 Right to left
    Weak   
    C2_EUROPENUMBER 0x0003 European number, European digit
    C2_EUROPESEPARATOR 0x0004 European numeric separator
    C2_EUROPETERMINATOR 0x0005 European numeric terminator
    C2_ARABICNUMBER 0x0006 Arabic number
    C2_COMMONSEPARATOR 0x0007 Common numeric separator
    Neutral   
    C2_BLOCKSEPARATOR 0x0008 Block separator
    C2_SEGMENTSEPARATOR 0x0009 Segment separator
    C2_WHITESPACE 0x000A White space
    C2_OTHERNEUTRAL 0x000B Other neutrals
    Not applicable    
    C2_NOTAPPLICABLE 0x0000 No implicit directionality (for example, control codes)

  • Ctype 3
    These types are intended to be placeholders for extensions to the POSIX types required for general text processing or for the standard C library functions. A combination of these values is returned when dwInfoType is set to CT_CTYPE3.

    Name Value Description
    C3_NONSPACING 0x0001 Nonspacing mark
    C3_DIACRITIC 0x0002 Diacritic nonspacing mark
    C3_VOWELMARK 0x0004 Vowel nonspacing mark
    C3_SYMBOL 0x0008 Symbol
    C3_KATAKANA 0x0010 Katakana character
    C3_HIRAGANA 0x0020 Hiragana character
    C3_HALFWIDTH 0x0040 Half-width character
    C3_FULLWIDTH 0x0080 Full-width character
    C3_IDEOGRAPH 0x0100 Ideographic character
    C3_KASHIDA 0x0200 Arabic Kashida character
    C3_LEXICAL 0x0400 Punctuation which is counted as part of the word (Kashida, hyphen, feminine/masculine ordinal indicators, equal sign, and so forth)
    C3_ALPHA 0x8000 All linguistic characters (alphabetic, syllabary, and ideographic)
    Not applicable    
    C3_NOTAPPLICABLE 0x0000 Not applicable

Requirements

Runs On Versions Defined in Include Link to
Windows CE OS 1.0 and later Winnls.h   Coreloc.lib, Locusa.lib

Note   This API is part of the complete Windows CE OS package as provided by Microsoft. The functionality of a particular platform is determined by the original equipment manufacturer (OEM) and some devices may not support this API.

See Also

GetLastError, GetLocaleInfo, GetStringTypeEx

 Last updated on Tuesday, July 13, 2004

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