nl_langinfo() is used to access individual elements of the locale categories. Unlike localeconv(), which returns all of the elements, nl_langinfo() allows you to select any specific element.
If item is not valid, FALSE will be returned.
item may be an integer value of the element or the constant name of the element. The following is a list of constant names for item that may be used and their description. Some of these constants may not be defined or hold no value for certain locales.
表格 1. nl_langinfo Constants
| Constant | Description |
|---|---|
| LC_TIME Category Constants | |
| ABDAY_(1-7) | Abbreviated name of n-th day of the week. |
| DAY_(1-7) | Name of the n-th day of the week (DAY_1 = Sunday). |
| ABMON_(1-12) | Abbreviated name of the n-th month of the year. |
| MON_(1-12) | Name of the n-th month of the year. |
| AM_STR | String for Ante meridian. |
| PM_STR | String for Post meridian. |
| D_T_FMT | String that can be used as the format string for strftime() to represent time and date. |
| D_FMT | String that can be used as the format string for strftime() to represent date. |
| T_FMT | String that can be used as the format string for strftime() to represent time. |
| T_FMT_AMPM | String that can be used as the format string for strftime() to represent time in 12-hour format with ante/post meridian. |
| ERA | Alternate era. |
| ERA_YEAR | Year in alternate era format. |
| ERA_D_T_FMT | Date and time in alternate era format (string can be used in strftime()). |
| ERA_D_FMT | Date in alternate era format (string can be used in strftime()). |
| ERA_T_FMT | Time in alternate era format (string can be used in strftime()). |
| LC_MONETARY Category Constants | |
| INT_CURR_SYMBOL | International currency symbol. |
| CURRENCY_SYMBOL | Local currency symbol. |
| CRNCYSTR | Same value as CURRENCY_SYMBOL. |
| MON_DECIMAL_POINT | Decimal point character. |
| MON_THOUSANDS_SEP | Thousands separator (groups of three digits). |
| MON_GROUPING | Like 'grouping' element. |
| POSITIVE_SIGN | Sign for positive values. |
| NEGATIVE_SIGN | Sign for negative values. |
| INT_FRAC_DIGITS | International fractional digits. |
| FRAC_DIGITS | Local fractional digits. |
| P_CS_PRECEDES | Returns 1 if CURRENCY_SYMBOL precedes a positive value. |
| P_SEP_BY_SPACE | Returns 1 if a space separates CURRENCY_SYMBOL from a positive value. |
| N_CS_PRECEDES | Returns 1 if CURRENCY_SYMBOL precedes a negative value. |
| N_SEP_BY_SPACE | Returns 1 if a space separates CURRENCY_SYMBOL from a negative value. |
| P_SIGN_POSN |
|
| N_SIGN_POSN | |
| LC_NUMERIC Category Constants | |
| DECIMAL_POINT | Decimal point character. |
| RADIXCHAR | Same value as DECIMAL_POINT. |
| THOUSANDS_SEP | Separator character for thousands (groups of three digits). |
| THOUSEP | Same value as THOUSANDS_SEP. |
| GROUPING | |
| LC_MESSAGES Category Constants | |
| YESEXPR | Regex string for matching 'yes' input. |
| NOEXPR | Regex string for matching 'no' input. |
| YESSTR | Output string for 'yes'. |
| NOSTR | Output string for 'no'. |
| LC_CTYPE Category Constants | |
| CODESET | Return a string with the name of the character encoding. |
注: 该函数不适用于 Windows 平台！
See also setlocale() and localeconv().