编译时遇到错误：
error MSB8031: Building an MFC project for a non-Unicode character set is deprecated. You must change the project property to Unicode or download an additional library. See https://go.microsoft.com/fwlink/p/?LinkId=286820 for more information. error MSB8031: Building an MFC pr
error MSB8031: Building an MFC project for a non-Unicode character set is deprecated. You must change the project property to Unicode or download an additional library. See https://go.microsoft.com/fwlink/p/?LinkId=286820 for more information. error MSB8031: Building an MFC pr
