基于C# 实现 OPC DA Server的问题小结

public enum OpcServerState
      {
          Failed = 2,
          NoConfig = 3,
          Running = 1,
          Suspended = 4,
          Test = 5
      }
 [ComVisible(true), Serializable, StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode, Pack=2)]
 public class ServerStatus
     {
         ///服务器启动时间
         public long ftStartTime;
         /// <summary>
         /// 当前时间
         /// </summary>
         public long ftCurrentTime;
         /// <summary>
         /// 最后一次更新客户的时间
         /// </summary>
         public long ftLastUpdateTime;
         /// <summary>
         /// 当前服务器状态
         /// </summary>
          [MarshalAs(UnmanagedType.U4)]
          public OpcServerState eServerState;
         /// <summary>
         /// 本服务器实例所管理的组对象数
         /// </summary>
         public int dwGroupCount;
         /// <summary>
         /// 当前使用带宽的百分比，现在返回未知  0xFFFFFFFF
         /// </summary>
         public int dwBandWidth;
         /// <summary>
         /// 主版本号
         /// </summary>
         public short wMajorVersion;
         /// <summary>
         /// 副版本号
         /// </summary>
         public short wMinorVersion;
         /// <summary>
         /// 编译号
         /// </summary>
         public short wBuildNumber;
         /// <summary>
         /// 保留
         /// </summary>
         public short wReserved;
         /// <summary>
         ///  厂商信息
         /// </summary>
         [MarshalAs(UnmanagedType.LPWStr)]
	 public string szVendorInfo;
     }
 public class OPCDAServer : IOPCServer, IOPCCommon,
         IOPCBrowseServerAddressSpace, IOPCItemProperties
         , IOPCBrowse, IOPCItemIO, IOPCServerPublicGroups,IDisposable
 {
     /// <summary>
         /// 获取服务器基本信息
         /// </summary>
         /// <param name="ppServerStatus">输出参数 服务器信息结构</param>
         /// <returns></returns>
         [PreserveSig]
         public int GetStatus(out ServerStatus ppServerStatus)
         {
             ppServerStatus = new ServerStatus();
             ppServerStatus.eServerState = OpcServerState.Running;
             ppServerStatus.szVendorInfo = "公司-个人组织";
             ppServerStatus.dwGroupCount = 10;
             ppServerStatus.ftCurrentTime = DateTime.Now.ToFileTime();
             ppServerStatus.ftLastUpdateTime = DateTime.Now.ToFileTime();
             ppServerStatus.ftStartTime = DateTime.Now.ToFileTime.ToFileTime();
             ppServerStatus.wMajorVersion = 1;
             ppServerStatus.wMinorVersion = 1;
             ppServerStatus.wBuildNumber = 0;
             return HRESULTS.S_OK;
         }
 }