std :: string到LPOLESTR

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

std::wstring s2ws(const std::string& str)
{
    int size_needed = MultiByteToWideChar(CP_UTF8, 0, &str[0], (int)str.size(), NULL, 0);
    std::wstring wstrTo(size_needed, 0);
    MultiByteToWideChar(CP_UTF8, 0, &str[0], (int)str.size(), &wstrTo[0], size_needed);
    return wstrTo;
}

int main()
{
    std::string str = "Hello, world!";
    std::wstring wstr = s2ws(str);
    LPOLESTR oleStr = &wstr[0];

    std::wcout << L"Converted string: " << oleStr<< std::endl;

    return 0;
}