OPC技术论坛 http://www.opc-china.com OPC服务器，客户程序技术讨论// REVISION:  04/06/98 08:00 PM (EST)// VERSIONINFO 1.0.0.0// // 04/09/98 acc import unknwn.idl rather than oaidl.idl// 06/15/98 acc add 'library' objec