在 C++ 中获取 `wchar_t*` 的长度

get length of `wchar_t*` in c++

提问by Jacob

Please, how can I find out the length of a variable of type wchar_t*in c++?

请问，我怎样才能找出wchar_t*C++中类型变量的长度？

code example below:

下面的代码示例：

wchar_t* dimObjPrefix = L"retro_";

I would like to find out how many characters dimObjPrefixcontains

我想知道dimObjPrefix包含多少个字符

回答by Bertrand Marron

If you want to know the size of a wchar_tstring(wchar_t *), you want to use wcslen(3):

如果您想知道wchar_t字符串( wchar_t *)的大小，您需要使用wcslen(3)：

size_t wcslen (const wchar_t *ws);

回答by wilx

Assuming that you want to get the length of null terminated C style string, you have two options:

假设您要获取空终止 C 样式字符串的长度，您有两个选择：

1. #include <cwchar>and use std::wcslen (dimObjPrefix);,
2. or #include <string>and use std::char_traits<wchar_t>::length (dimObjPrefix);.

1. #include <cwchar>并使用std::wcslen (dimObjPrefix);，
2. 或#include <string>并使用std::char_traits<wchar_t>::length (dimObjPrefix);.