VC MFC 中的字符串转换

// 宽字符转UTF8
string EncodeUtf8(wstring in)
{
    string s(in.length()*3+1,‘ ‘);
    size_t len = ::WideCharToMultiByte(CP_UTF8, 0, in.c_str(), in.length(), &s[0], s.length(), NULL, NULL);
    s.resize(len);
    return s;
} 

// UTF8 转宽字符
wstring DecodeUtf8(string in)
{
    wstring s(in.length(), _T(‘ ‘));
    size_t len = ::MultiByteToWideChar(CP_UTF8, 0, in.c_str(), in.length(), &s[0], s.length());
    s.resize(len);
    return s;
}