Trouble with UTF-8 input

Question

My simple code has no trouble with Japanese characters when outputting, but for some reason it doesn't take input properly, is it lacking something?

int main()
{
    _setmode(_fileno(stdout), _O_U16TEXT);
    SetConsoleCP(CP_UTF8);

std::wstring s = L"こんにちは, 世界!\nHello, World!";
std::wcout << s << endl;
std::wstring test;

getline(wcin, test);

std::wstring test2 = test;
std::wcout << test2 << endl;

std::wstring test3 = test2;
std::wcout << test3 << endl;
std::wcout << "Press ENTER to exit.";
std::wcout << "\n";
cin.get();
return 0;
}

Answer 1

This code worked for me in the Windows 10 command prompt.

#include <fcntl.h>
#include <io.h>
#include <string>
#include <iostream>

using namespace std;

int main()
{
    _setmode(_fileno(stdout), _O_WTEXT);  // or _O_U16TEXT, either work
    _setmode(_fileno(stdin), _O_WTEXT);

    wstring s = L"こんにちは, 世界!\nHello, World!";
    wcout << s << endl;

    wstring test;
    getline(wcin, test);
    wcout << test << endl;
    return 0;
}

Output:

C:\>test
こんにちは, 世界!
Hello, World!
你好马克！                << input line
你好马克！