function compares two character strings. The comparison is not case
| LPCTSTR lpString1,
||// address of first string
| LPCTSTR lpString2
||// address of second string
Points to the first null-terminated string to be compared.
Points to the second null-terminated string to be compared.
If the function succeeds and the string pointed to by lpString1
is less than the string pointed to by lpString2
, the return value is negative; if the string pointed to by lpString1
is greater than the string pointed to by lpString2
, it is positive. If the strings are equal, the return value is zero.
function compares two strings by checking the first characters against each
other, the second characters against each other, and so on until it finds an
inequality or reaches the ends of the strings.
The function returns the difference of the values of the first unequal
characters it encounters. For example, lstrcmpi
determines that "abcz" is greater than "abcdefg" and returns the difference
The language (locale) selected by the user at setup time, or by using the
control panel, determines which string is greater (or whether the strings are the
same). If no language (locale) is selected, Windows performs the comparison by
using default values.
For some locales, the lstrcmpi
function may be insufficient. If this occurs, use CompareString
to ensure proper comparison. For example, in Japan call CompareString
with the IGNORE_CASE, IGNORE_KANATYPE, and IGNORE_WIDTH values to achieve the
most appropriate non-exact string comparison. The IGNORE_KANATYPE and
IGNORE_WIDTH values are ignored in non-Asian locales, so you can set these values for
all locales and be guaranteed to have a culturally correct "insensitive" sorting
regardless of the locale. Note that specifying these values slows performance,
so use them only when necessary.
With a double-byte character set (DBCS) version of Windows, this function can
compare two DBCS strings.
The Win32 lstrcmpi
function uses a word sort, rather than a string sort. A word sort treats
hyphens and apostrophes differently than it treats other symbols that are not
alphanumeric, in order to ensure that words such as "coop" and "co-op" stay together
within a sorted list. Note that in 16-bit versions of Windows, lstrcmpi
uses a string sort. For a detailed discussion of word sorts and string sorts,
see the Remarks
section of the reference page for the CompareString
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