GetStringTypeW

The GetStringTypeW 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 GetStringTypeW(

DWORD dwInfoType,	// information-type options
LPCWSTR lpSrcStr,	// address of source string
int cchSrc,	// number of characters in string
LPWORD lpCharType	// address of buffer for output
);

Parameters

dwInfoType

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:

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

lpSrcStr

Points 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

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

lpCharType

Points 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

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. GetLastError may return one of the following error codes:

ERROR_INVALID_FLAGS
ERROR_INVALID_PARAMETER

Remarks

Note that the GetStringTypeA function has one more parameter than the GetStringTypeW function: GetStringTypeA has a first parameter that is an LCID named Locale. This parameter does not exist in the GetStringTypeW function. Because of that parameter difference, an application cannot automatically invoke the proper A or W version of GetStringType* through the use of the #define UNICODE switch. An application can circumvent this limitation by using GetStringTypeEx; it is the recommended Win32 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	Meaning
C1_UPPER	x0001	Uppercase
C1_LOWER	x0002	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	Meaning
Strong:
C2_LEFTTORIGHT	x1	Left to right
C2_RIGHTTOLEFT	x2	Right to left
Weak:
C2_EUROPENUMBER	x3	European number, European digit
C2_EUROPESEPARATOR	x4	European numeric separator
C2_EUROPETERMINATOR	x5	European numeric terminator
C2_ARABICNUMBER	x6	Arabic number
C2_COMMONSEPARATOR	x7	Common numeric separator
Neutral:
C2_BLOCKSEPARATOR	x8	Block separator
C2_SEGMENTSEPARATOR	x9	Segment separator
C2_WHITESPACE	xA	White space
C2_OTHERNEUTRAL	xB	Other neutrals
Not applicable:
C2_NOTAPPLICABLE	0x0	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. These types are supported in the current version of Windows NT. A combination of these values is returned when dwInfoType is set to CT_CTYPE3.

Name	Value	Meaning
C3_NONSPACING	x1	Nonspacing mark
C3_DIACRITIC	x2	Diacritic nonspacing mark
C3_VOWELMARK	0x4	Vowel nonspacing mark
C3_SYMBOL	0x8	Symbol
C3_KATAKANA	0x10	Katakana character
C3_HIRAGANA	0x20	Hiragana character
C3_HALFWIDTH	0x40	Half-width character
C3_FULLWIDTH	0x80	Full-width character
C3_IDEOGRAPH	0x100	Ideographic character
C3_KASHIDA	0x200	Arabic Kashida character
C3_ALPHA	0x8000	All linguistic characters (alphabetic, syllabary, and ideographic)
Not applicable:
C3_NOTAPPLICABLE	0x0	Not applicable

See Also

GetLocaleInfo, GetStringTypeA, GetStringTypeEx

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