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 valuedest
[edit] NotesIn typical usage, count is the size of the destination array.
[edit] Example#include <cwchar>
#include <iostream>
int main()
{
const 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 (const 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 copies one wide string to another
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