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String Manipulation in Windows
Many Windows functions duplicate or enhance familiar string-manipulation
functions from the standard C library. Many of the enhancements enable Windows
functions to work with Unicode or extended character sets. For example, the Windows
functions in the following table are identical to standard C functions except
that the Windows functions are enhanced for use with Unicode.
The strlen standard C function, for example, always returns the number of bytes in a
string, but the lstrlen function returns the number of characters, regardless of whether the
characters are 1 or 2 bytes wide.
The following Windows functions differ from standard C functions such as tolower and toupper in that they operate on any character in a character set. By using the CharLower function, for example, a Windows-based application can convert an uppercase U
with an umlaut (Ü) to lowercase (ü). For more information about character
sets, see Single-byte Character Sets.
Function
| Description
| CharLower
| Converts a character or string to lowercase.
| CharLowerBuff
| Converts a character string to lowercase.
| CharNext
| Moves to the next character in a string.
| CharPrev
| Moves to the preceding character in a string.
| CharUpper
| Converts a character or string to uppercase.
| CharUpperBuff
| Converts a string to uppercase.
|
The following Windows functions make determinations about a character based on
the semantics of the language selected by the user. These functions are
Unicode enabled.
Function
| Description
| IsCharAlpha
| Determines whether a character is alphabetic.
| IsCharAlphaNumeric
| Determines whether a character is alphanumeric.
| IsCharLower
| Determines whether a character is lowercase.
| IsCharUpper
| Determines whether a character is uppercase.
|
The wsprintf and wvsprintf functions are extensions to the standard C functions sprintf and vsprintf. The Windows versions support format specifications unique to Unicode.
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