使用 OPC Browser 加载 OPC Server 监测点

1,首先第一步，要连接OPC ，创建好 OPC对象。

        /// <summary>
        /// 连接OPC
        /// </summary>

       private string OPCIP=127.0.0.1;

       private string OPCName=PCAuto.OPCServer;

        public void Connect()
        {
            if (string.IsNullOrEmpty(OPCIP))
            {
                throw new ArgumentNullException("UaServer");
            }
            if (string.IsNullOrEmpty(OPCName))
            {
                throw new ArgumentNullException("UaServer");
            }
            if (CreateServer())
            {
                try
                {
                    opcServer.Connect(OPCName, OPCIP);
                }
                catch (Exception ex)
                {
                    MessageBox.Show("连接到OPC服务器失败！" + ex.Message);
                }
            }
            m_IsConnected = true;
        }

        /// <summary>
        /// 创建OPC服务
        /// </summary>
        /// <returns></returns>
        public bool CreateServer()
        {
            try
            {
                opcServer = new OPCServer();
            }
            catch (Exception ex)
            {
                MessageBox.Show("创建OPC服务出现异常：" + ex.Message);
                return false;
            }
            return true;
        }

2.窗体加载方法，我这里时winform 开发的程序。在窗体load事件加载 opc测点。使用 tree 控件。

        /// <summary>
        /// 测点扫描加载监测点树
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private TreeView treeView_opcItem;
        private void ScanItem_Load(object sender, EventArgs e)
        {
            try
            {
                OpcDaClient opcDaClient = new OpcDaClient();
                TreeNode node = new TreeNode();
                OPCBrowser opcBrowser = opcDaClient.RecurBrowse();
                opcDaClient.ShowInTreeView(opcBrowser, node);
                treeView_opcItem.Nodes.Add(node);
                TreeNodeCollection nodes = treeView_opcItem.Nodes;
                GetChildNode(nodes);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

3.用到的子方法

        /// <summary>
        /// 创建opc节点浏览对象
        /// </summary>
        /// <returns></returns>
        public OPCBrowser RecurBrowse()
        {
            try
            {
                return opcServer.CreateBrowser();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                return null;
            }
        }

   /// <summary>
        /// 展示OPC点号列表
        /// </summary>
        /// <param name="opcBrowser"></param>
        /// <param name="node"></param>
        public void ShowInTreeView(OPCBrowser opcBrowser, TreeNode node)
        {
            TreeNode treeNode = null;
            opcBrowser.ShowBranches();
            int count = opcBrowser.Count;
            List<string> list = null;
            if (opcBrowser.Count > 0)
            {
                list = new List<string>();
                foreach (string item in opcBrowser)
                {
                    list.Add(item);
                }
                foreach (string item2 in list)
                {
                    treeNode = new TreeNode(item2);
                    treeNode.Tag = opcBrowser.GetItemID(item2);
                    node.Nodes.Add(treeNode);
                    opcBrowser.MoveDown(item2);
                    ShowInTreeView(opcBrowser, treeNode);
                    opcBrowser.MoveUp();
                }
            }
            opcBrowser.ShowLeafs(Type.Missing);
            int count2 = opcBrowser.Count;
            foreach (string item3 in opcBrowser)
            {
                treeNode = new TreeNode(opcBrowser.GetItemID(item3));
                treeNode.Tag = opcBrowser.GetItemID(item3);
                node.Nodes.Add(treeNode);
            }
        }

4.获取当前节点下的子节点

        private void GetChildNode(TreeNodeCollection nodes)
        {
            string empty = string.Empty;
            foreach (TreeNode node in nodes)
            {
                empty = node.Text;
                if (node.Nodes.Count == 0)
                {
                    itemNameList.Add(node.Text);
                }
                GetChildNode(node.Nodes);
            }
        }

5.效果展示