std::string to_bytes(const std::wstring& str) {
    std::string result;
    if (str.length() > 0) {
      char* buffer = new (std::nothrow) char[str.length() * 4];
      if (nullptr != buffer) {
        if (0 != WideCharToMultiByte(CP_ACP,
                                     0,
                                     str.c_str(),
                                     -1,
                                     buffer,
                                     str.length() * 4,
                                     NULL,
                                     NULL)) {
          result = buffer;
          delete[] buffer;
        }
      }
    }

    return result;
  }

//
//  Code Page Default Values.
//  Please Use Unicode, either UTF-16 (as in WCHAR) or UTF-8 (code page CP_ACP)
//
#define CP_ACP                    0           // default to ANSI code page