##### cppreference.com

##### Search

Create account

##### Namespaces

- Page
- Discussion

##### Variants

##### Views

- View
- Edit
- History

##### Actions

# std::wcsncpy

From cppreference.com
< cpp‎ | string‎ | wide

Defined in header `<cwchar>` |  |
wchar_t *wcsncpy( wchar_t *dest, const wchar_t *src, std::size_t count ); |  |

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`.

If `count` is reached before the entire string `src` was copied, the resulting wide character array is not null-terminated.

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.

If the strings overlap, the behavior is undefined.

### [edit] Parameters

dest | - | pointer to the wide character array to copy to
src | - | pointer to the wide string to copy from
count | - | maximum number of wide characters to copy

### [edit] Return value

`dest`

### [edit] Notes

In typical usage, `count` is the size of the destination array.

### [edit] Example

Run this code

    #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';
    }

Output:

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

### [edit] See also

wcscpy | copies one wide string to another (function) [edit]
wmemcpy | copies a certain amount of wide characters between two non-overlapping arrays (function) [edit]
C documentation for wcsncpy

Retrieved from "http://en.cppreference.com/mwiki/index.php?title=cpp/string/wide/wcsncpy&oldid=59125"