Function from_wpath

OgreMain/src/OgreFileSystem.cpp:130–145

        return L"";
    }
    String from_wpath( const std::wstring &text, unsigned codepage = CP_UTF8 )
    {
        const int length =
            ::WideCharToMultiByte( codepage, 0, text.c_str(), (int)text.size(), NULL, 0, NULL, NULL );
        if( length > 0 )
        {
            String str;
            str.resize( length );
            if( 0 != ::WideCharToMultiByte( codepage, 0, text.c_str(), (int)text.size(), &str[0],
                                            (int)str.size(), NULL, NULL ) )
            {
                return str;
            }
        }
        return "";
    }
    FileSystemPath fileSystemPathFromString( const String &path )
    {
#    ifdef _OGRE_FILESYSTEM_ARCHIVE_UNICODE