Namespace
Varianti

std::setlocale

Da cppreference.com.
< cpp‎ | locale

 
 
Localizzazioni libreria
Impostazioni internazionali e sfaccettature
Original:
Locales and facets
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locale
Carattere classificazione
Original:
Character classification
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Conversioni
Original:
Conversions
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Facet categoria classi di base
Original:
Facet category base classes
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Facet categorie
Original:
Facet categories
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Locale specifici aspetti
Original:
Locale-specific facets
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Codice di conversione sfaccettature
Original:
Code conversion facets
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codecvt_utf8(C++11)
codecvt_utf16(C++11)
C locale
Original:
C locale
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setlocale
localeconv
lconv
 
Defined in header <clocale>
char* setlocale( int category, const char* locale);
La funzione setlocale installa la versione locale specificata sistema o sua porzione, come la nuova versione locale C. Le modifiche rimangono attive e influenza l'esecuzione di tutti i dipendenti dalle impostazioni internazionali funzioni di libreria C fino alla successiva chiamata a setlocale. Se locale è un puntatore nullo, setlocale interroga il locale corrente C senza modificarlo.
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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Indice

[modifica] Parametri

category - . Può essere nullo .
Original:
locale -
specifico del sistema identificatore delle impostazioni locali. Può essere "" per l'utente-locale preferito o "C" per le impostazioni minime
Original:
system-specific locale identifier. Can be "" for the user-preferred locale or "C" for the minimal locale
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[modifica] Valore di ritorno

Puntatore a una ristretta stringa con terminazione null che identifica la versione locale C dopo aver applicato le modifiche, se del caso, o un puntatore nullo in caso di fallimento.
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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[modifica] Note

Durante l'avvio del programma, l'equivalente di std::setlocale(LC_ALL, "C"); viene eseguito prima di qualsiasi codice utente viene eseguito.
Original:
During program startup, the equivalent of std::setlocale(LC_ALL, "C"); is executed before any user code is run.
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Anche se il tipo di ritorno è char*, modificando le punta-a caratteri è un comportamento indefinito.
Original:
Although the return type is char*, modifying the pointed-to characters is undefined behavior.
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Perché setlocale modifica lo stato globale che colpisce l'esecuzione di funzioni dipendenti dalle impostazioni internazionali, è un comportamento indefinito di chiamare da un thread, mentre un altro thread sta eseguendo una qualsiasi delle seguenti funzioni: std::fprintf, std::isprint, std::iswdigit, std::localeconv, std::tolower, std::fscanf, std::ispunct, std::iswgraph, std::mblen, std::toupper, std::isalnum, std::isspace, std::iswlower, std::mbstowcs, std::towlower, std::isalpha, std::isupper, std::iswprint, std::mbtowc, std::towupper, std::isblank, std::iswalnum, std::iswpunct, std::setlocale, std::wcscoll, std::iscntrl, std::iswalpha, std::iswspace, std::strcoll, std::wcstod, std::isdigit, std::iswblank, std::iswupper, std::strerror, std::wcstombs, std::isgraph, std::iswcntrl, std::iswxdigit, std::strtod, std::wcsxfrm, std::islower, std::iswctype, std::isxdigit.
Original:
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[modifica] Esempio

#include <cstdio>
#include <clocale>
#include <ctime>
#include <cwchar>
 
int main()
{
    // the C locale will be UTF-8 enabled English;
    // decimal dot will be German
    // date and time formatting will be Japanese
    std::setlocale(LC_ALL, "en_US.UTF-8");
    std::setlocale(LC_NUMERIC, "de_DE");
    std::setlocale(LC_TIME, "ja_JP");
 
    wchar_t str[100];
    std::time_t t = std::time(NULL);
    std::wcsftime(str, 100, L"%A %c", std::localtime(&t));
    std::wprintf(L"Number: %.2f\nDate: %Ls\n", 3.14, str);
}

Output:

Number: 3,14
Date: 月曜日 2011年12月19日 18時04分40秒

[modifica] Vedi anche

le categorie di locale per std::setlocale
Original:
locale categories for std::setlocale
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(macro costante) [edit]
serie di aspetti polimorfi che incapsulano le differenze culturali
Original:
set of polymorphic facets that encapsulate cultural differences
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(classe) [edit]
C documentation for setlocale