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std::wcsncpy

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< cpp‎ | string‎ | wide

 
 
Bibliothèque de chaînes de caractères
Chaînes à zéro terminal
Original:
Null-terminated strings
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Les chaînes d'octets
Chaines multi-octets
Les chaînes étendues
Classes
Original:
Classes
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basic_string
char_traits
 
Chaînes à zéro terminal de large
Fonctions
Original:
Functions
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Manipulation caractère
Original:
Character manipulation
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Conversion aux formats numériques
Original:
Conversions to numeric formats
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La manipulation de chaînes
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String manipulation
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La manipulation des tableaux
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Array manipulation
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wmemcpy
wmemmove
wmemcmp
wmemchr
wmemset
 
Defined in header <cwchar>
wchar_t *wcsncpy( wchar_t *dest, const wchar_t *src, std::size_t count );
Des copies de la plupart des personnages count de la chaîne pointée par gamme src (y compris le caractère nul final) au tableau de caractères larges pointée par dest .
Original:
Copies at most count characters of the wide string pointed to by src (including the terminating null wide character) to wide character array pointed to by dest.
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Si count est atteint avant la src chaîne entière a été copié, le tableau de caractères large en résultant n'est pas terminée par NULL .
Original:
If count is reached before the entire string src was copied, the resulting wide character array is not null-terminated.
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Si, après avoir copié le caractère nul final de src, count n'est pas atteint, d'autres caractères larges nuls sont écrites dest jusqu'à ce que le total de caractères count ont été écrit .
Original:
If, after copying the terminating null wide character from src, count is not reached, additional null wide characters are written to dest until the total of count characters have been written.
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Si les cordes se chevauchent, le comportement est indéfini .
Original:
If the strings overlap, the behavior is undefined.
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Sommaire

[modifier] Paramètres

dest -
pointeur vers le tableau de caractères larges de la copie
Original:
pointer to the wide character array to copy to
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src -
pointeur vers la chaîne de gamme à copier
Original:
pointer to the wide string to copy from
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count -
nombre maximum de caractères larges à copier
Original:
maximum number of wide characters to copy
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[modifier] Retourne la valeur

dest

[modifier] Notes

En utilisation normale, count est la taille du tableau de destination .
Original:
In typical usage, count is the size of the destination array.
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[modifier] Exemple

#include <iostream>
#include <cwchar>
 
int main()
{
    wchar_t src[] = L"hi";
    wchar_t dest[6] = {L'a', L'b', L'c', L'd', L'e', L'f'};;
 
    std::wcsncpy(dest, src, 5); // this will copy hi and repeat \0 three times
 
    std::wcout << "The contents of dest are: ";
    for(wchar_t c : dest) {
        if(c)
            std::wcout << c << ' ';
        else
            std::wcout << "\\0" << ' ';
    }
    std::wcout << '\n';
}

Résultat :

The contents of dest are: h i \0 \0 \0 f

[modifier] Voir aussi

copie une chaîne large à l'autre
Original:
copies one wide string to another
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(fonction) [edit]
copie d'un certain nombre de caractères larges entre deux rangées ne se chevauchent pas
Original:
copies a certain amount of wide characters between two non-overlapping arrays
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(fonction) [edit]
C documentation for wcsncpy