CharPrevA function (winuser.h)
Retrieves a pointer to the preceding character in a string. This function can handle strings consisting of either single- or multi-byte characters.
Syntax
LPSTR CharPrevA(
[in] LPCSTR lpszStart,
[in] LPCSTR lpszCurrent
);
Parameters
[in] lpszStart
Type: LPCTSTR
The beginning of the string.
[in] lpszCurrent
Type: LPCTSTR
A character in a null-terminated string.
Return value
Type: LPTSTR
The return value is a pointer to the preceding character in the string, or to the first character in the string if the lpszCurrent parameter equals the lpszStart parameter.
Remarks
When called as an ANSI function, CharPrev uses the system default code-page, whereas CharPrevExA specifies a code-page to use.
This function works with default "user" expectations of characters when dealing with diacritics. For example: A string that contains U+0061 U+030a "LATIN SMALL LETTER A" + COMBINING RING ABOVE" — which looks like "å", will advance two code points, not one. A string that contains U+0061 U+0301 U+0302 U+0303 U+0304 — which looks like "a´^~¯", will advance five code points, not one, and so on.
Note
The winuser.h header defines CharPrev as an alias that automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that is not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Target Platform | Windows |
| Header | winuser.h (include Windows.h) |
| Library | User32.lib |
| DLL | User32.dll |
See also
Conceptual
Reference