如何在C++(Unicode)中将std :: string转换为LPCWSTR

#include<iostream>
#include<string>
#include<windows.h>

std::wstring s2ws(const std::string& s)
{
    int len;
    int slength = (int)s.length() + 1;
    len = MultiByteToWideChar(CP_ACP, 0, s.c_str(), slength, 0, 0);
    wchar_t* buf = new wchar_t[len];
    MultiByteToWideChar(CP_ACP, 0, s.c_str(), slength, buf, len);
    std::wstring r(buf);
    delete[] buf;
    return r;
}

int main()
{
    std::string str = "Hello, World!";
    std::wstring wstr = s2ws(str);
    LPCWSTR lpcwstr = wstr.c_str();
    std::wcout << L"Converted string: " << lpcwstr<< std::endl;
    return 0;
}