static std::wstring m2w(std::string ch, unsigned int CodePage = CP_ACP)

{

    if (ch.empty())return L"";

    std::wstring ret;

    DWORD dwOutSize = ;

    dwOutSize = MultiByteToWideChar(CodePage, , ch.c_str(), -, NULL, );

    ret.resize(dwOutSize - );

    MultiByteToWideChar(CodePage, , ch.c_str(), ch.size(), &ret[], dwOutSize);

    return ret;

}

static std::string w2m(std::wstring wch, unsigned int CodePage = CP_ACP)

{

    std::string ret;

    DWORD dwOutSize = ;

    dwOutSize = WideCharToMultiByte(CodePage, , wch.c_str(), -, NULL, , NULL, FALSE);

    char *pwText = ;

    pwText = new char[dwOutSize];

    pwText[dwOutSize - ] = '\0';

    WideCharToMultiByte(CodePage, , wch.c_str(), wch.size(), pwText, dwOutSize, NULL, FALSE);

    ret = pwText;

    if (pwText)delete[]pwText;

    return ret;

}