windows c++ wchar_t* 转 string

以下是将wchar_t*转换为string的两种方法：
1.使用wstring_convert

#include <locale>
#include <codecvt>
#include <string>

std::wstring ws_str(L"你好中国");
std::wstring_convert<std::codecvt_utf8<wchar_t>> converter;
std::string str = converter.to_bytes(ws_str);

2.使用wcstombs_s和malloc/free

#include <stdlib.h>
#include <string>

char* wchar2char(const wchar_t* wStr){
    char *str;
    size_t len = wcslen(wStr) + 1;
    size_t converted = 0;
    str=(char*)malloc(len*sizeof(char));
    wcstombs_s(&converted, str, len, wStr, _TRUNCATE);
    char* res = str;
    free(str);
    return res;
}

wchar_t wc_str[] = L"你好中国";
char* c_str = wchar2char(wc_str);
std::string str(c_str);