UA-.NETStandard/SampleApplications/Workshop/Views/Client/MainForm.cs

/* ========================================================================
 * Copyright (c) 2005-2019 The OPC Foundation, Inc. All rights reserved.
 *
 * OPC Foundation MIT License 1.00
 * 
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following
 * conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * The complete license agreement can be found here:
 * http://opcfoundation.org/License/MIT/1.00/
 * ======================================================================*/

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Security.Cryptography.X509Certificates;
using System.Windows.Forms;
using System.IO;
using Opc.Ua;
using Opc.Ua.Client;
using Opc.Ua.Client.Controls;

namespace Quickstarts.ViewsClient
{
    /// <summary>
    /// The main form for a simple Quickstart Client application.
    /// </summary>
    public partial class MainForm : Form
    {
        #region Constructors
        /// <summary>
        /// Creates an empty form.
        /// </summary>
        private MainForm()
        {
            InitializeComponent();
            this.Icon = ClientUtils.GetAppIcon();
        }
        
        /// <summary>
        /// Creates a form which uses the specified client configuration.
        /// </summary>
        /// <param name="configuration">The configuration to use.</param>
        public MainForm(ApplicationConfiguration configuration)
        {
            InitializeComponent();
            this.Icon = ClientUtils.GetAppIcon();

            ConnectServerCTRL.Configuration = m_configuration = configuration;
            ConnectServerCTRL.ServerUrl = "opc.tcp://localhost:62561/Quickstarts/ViewsServer";
            this.Text = m_configuration.ApplicationName;
        }
        #endregion

        #region Private Fields
        private ApplicationConfiguration m_configuration;
        private Session m_session;
        private bool m_connectedOnce;
        #endregion

        #region Private Methods
        #endregion

        #region Event Handlers
        /// <summary>
        /// Connects to a server.
        /// </summary>
        private void Server_ConnectMI_Click(object sender, EventArgs e)
        {
            try
            {
                ConnectServerCTRL.Connect().Wait();
            }
            catch (Exception exception)
            {
                ClientUtils.HandleException(this.Text, exception);
            }
        }

        /// <summary>
        /// Disconnects from the current session.
        /// </summary>
        private void Server_DisconnectMI_Click(object sender, EventArgs e)
        {
            try
            {
                ConnectServerCTRL.Disconnect();
            }
            catch (Exception exception)
            {
                ClientUtils.HandleException(this.Text, exception);
            }
        }

        /// <summary>
        /// Prompts the user to choose a server on another host.
        /// </summary>
        private void Server_DiscoverMI_Click(object sender, EventArgs e)
        {
            try
            {
                ConnectServerCTRL.Discover(null);
            }
            catch (Exception exception)
            {
                ClientUtils.HandleException(this.Text, exception);
            }
        }

        /// <summary>
        /// Updates the application after connecting to or disconnecting from the server.
        /// </summary>
        private void Server_ConnectComplete(object sender, EventArgs e)
        {
            try
            {
                m_session = ConnectServerCTRL.Session;

                // set a suitable initial state.
                if (m_session != null && !m_connectedOnce)
                {
                    m_connectedOnce = true;

                    BrowseDescription nodeToBrowse = new BrowseDescription();

                    nodeToBrowse.NodeId = Opc.Ua.ObjectIds.ViewsFolder;
                    nodeToBrowse.ReferenceTypeId = Opc.Ua.ReferenceTypeIds.HierarchicalReferences;
                    nodeToBrowse.IncludeSubtypes = true;
                    nodeToBrowse.BrowseDirection = BrowseDirection.Forward;
                    nodeToBrowse.NodeClassMask = 0;
                    nodeToBrowse.ResultMask = (uint)BrowseResultMask.All;

                    ReferenceDescriptionCollection references = ClientUtils.Browse(m_session, nodeToBrowse, false);

                    ViewCB.Items.Clear();
                    ViewCB.Items.Add(new ReferenceDescription() { NodeId = ExpandedNodeId.Null, DisplayName = "None" });

                    if (references != null)
                    {
                        for (int ii = 0; ii < references.Count; ii++)
                        {
                            ViewCB.Items.Add(references[ii]);
                        }
                    }

                    ViewCB.SelectedIndex = 0;
                }

                // browse the instances in the server.
                BrowseCTRL.Initialize(m_session, ObjectIds.ObjectsFolder, ReferenceTypeIds.Organizes, ReferenceTypeIds.Aggregates);
            }
            catch (Exception exception)
            {
                ClientUtils.HandleException(this.Text, exception);
            }
        }

        /// <summary>
        /// Updates the application after a communicate error was detected.
        /// </summary>
        private void Server_ReconnectStarting(object sender, EventArgs e)
        {
            try
            {
                BrowseCTRL.ChangeSession(null);
            }
            catch (Exception exception)
            {
                ClientUtils.HandleException(this.Text, exception);
            }
        }

        /// <summary>
        /// Updates the application after reconnecting to the server.
        /// </summary>
        private void Server_ReconnectComplete(object sender, EventArgs e)
        {
            try
            {
                m_session = ConnectServerCTRL.Session;
                BrowseCTRL.ChangeSession(m_session);
            }
            catch (Exception exception)
            {
                ClientUtils.HandleException(this.Text, exception);
            }
        }

        /// <summary>
        /// Cleans up when the main form closes.
        /// </summary>
        private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            ConnectServerCTRL.Disconnect();
        }
        #endregion

        private void ChangeViewBTN_Click(object sender, EventArgs e)
        {
            try
            {
                ViewDescription view = null;

                ReferenceDescription reference = ViewCB.SelectedItem as ReferenceDescription;

                if (reference != null && !NodeId.IsNull(reference.NodeId))
                {
                    view = new ViewDescription();
                    view.ViewId = ExpandedNodeId.ToNodeId(reference.NodeId, m_session.NamespaceUris);
                    view.ViewVersion = 0;
                    view.Timestamp = DateTime.MinValue;
                }

                BrowseCTRL.View = view;
                BrowseCTRL.RefreshSelection();
            }
            catch (Exception exception)
            {
                ClientUtils.HandleException(this.Text, exception);
            }
        }
    }
}