setlocale

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< c | locale

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C
 
本地化的支持
setlocale
localeconv
lconv
语言环境种类
Original:
Locale categories
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LC_ALL
LC_COLLATE
LC_CTYPE
LC_MONETARY
LC_NUMERIC
LC_TIME
 
Defined in header <locale.h>
char* setlocale( int category, const char* locale);
setlocale功能安装指定的系统区域设置或部分作为新的C语言环境。的修改仍然有效，并影响到执行的所有语言环境敏感的C库函​​数，直到下一次调用setlocale。 locale是一个空指针，setlocale查询当前的C语言环境，而无需修改
Original:
The setlocale function installs the specified system locale or its portion as the new C locale. The modifications remain in effect and influences the execution of all locale-sensitive C library functions until the next call to setlocale. If locale is a null pointer, setlocale queries the current C locale without modifying it.
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目录

[编辑] 参数

category -
语言环境类别标识，<div class="t-tr-text">LC_xxx
Original:
LC_xxx
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宏之一。可能是空的
Original:
locale category identifier, one of the
LC_xxx
Original:
LC_xxx
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</div> macros. May be null.
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locale -
系统特定的区域设置标识符。 ""为用户首选的语言环境或的最小的语言环境。"C"功能安装指定的系统区域设置或修改的部分作为新的C语言环境。留在效果和影响所有语言环境敏感的C库函​​数的执行
Original:
system-specific locale identifier. Can be "" for the user-preferred locale or "C" for the minimal locale
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[编辑] 返回值

指针到一个狭窄的null结尾的字符串识别应用变更后的C语言环境，如果有的话，则返回null指针，失败.
Original:
pointer to a narrow null-terminated string identifying the C locale after applying the changes, if any, or null pointer on failure.
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[编辑] 注释

在程序启动时，相当于setlocale(LC_ALL, "C");任何用户代码运行之前执行.
Original:
During program startup, the equivalent of setlocale(LC_ALL, "C"); is executed before any user code is run.
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虽然返回类型是char*，修改所指向的字符是不确定的行为.
Original:
Although the return type is char*, modifying the pointed-to characters is undefined behavior.
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，因为setlocale修改全球状态，影响执行的语言环境相关的功能，它是不确定的行为从一个线程来调用它，而另一个线程正在执行以下功能：fprintf，isprint，iswdigit，localeconv，tolower，fscanf，ispunct，iswgraph，mblen， toupper，isalnum，isspace，iswlower，mbstowcs，towlower，isalpha，isupper，iswprint，mbtowc，towupper，isblank，iswalnum，iswpunct，setlocale，wcscoll，iscntrl，iswalpha，iswspace，strcoll，wcstod，isdigit，iswblank，iswupper，strerror， wcstombs，isgraph，iswcntrl，iswxdigit，strtod，wcsxfrm，islower，iswctype，isxdigit.
Original:
Because setlocale modifies global state which affects execution of locale-dependent functions, it is undefined behavior to call it from one thread, while another thread is executing any of the following functions: fprintf, isprint, iswdigit, localeconv, tolower, fscanf, ispunct, iswgraph, mblen, toupper, isalnum, isspace, iswlower, mbstowcs, towlower, isalpha, isupper, iswprint, mbtowc, towupper, isblank, iswalnum, iswpunct, setlocale, wcscoll, iscntrl, iswalpha, iswspace, strcoll, wcstod, isdigit, iswblank, iswupper, strerror, wcstombs, isgraph, iswcntrl, iswxdigit, strtod, wcsxfrm, islower, iswctype, isxdigit.
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[编辑] 为例

#include <time.h>
#include <locale.h>
#include <time.h>
#include <locale.h>
int main()
{
    time_t now;
    struct tm *timeinfo;
    char buf[100];
 
    time(&now);
    timeinfo = localtime(&now);
 
    printf("Locale is :%s\n", setlocale(LC_ALL, NULL));
    strftime(buf, 100, "%c", timeinfo);
    printf("now is :%s\n", buf);
 
    setlocale(LC_ALL, "");
    printf("Locale is :%s\n", setlocale(LC_ALL, NULL));
    strftime(buf, 100, "%c", timeinfo);
    printf("now is :%s\n", buf);
 
    return 0;
}

Output: 

Locale is :C
now is :05/12/13 00:39:28
Locale is :Chinese (Simplified)_People's Republic of China.936
now is :2013/5/12 0:39:28


[编辑] 另请参阅
setlocale的语言环境类别
Original:
locale categories for setlocale
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（宏不变） [edit]
C++ documentation for setlocale
来自“http://zh.cppreference.com/mwiki/index.php?title=c/locale/setlocale&oldid=29306”