108 lines
3.5 KiB
C#
108 lines
3.5 KiB
C#
#region Copyright (c) 2011-2023 Technosoftware GmbH. All rights reserved
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//-----------------------------------------------------------------------------
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// Copyright (c) 2011-2023 Technosoftware GmbH. All rights reserved
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// Web: https://www.technosoftware.com
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//
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// The source code in this file is covered under a dual-license scenario:
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// - Owner of a purchased license: SCLA 1.0
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// - GPL V3: everybody else
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//
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// SCLA license terms accompanied with this source code.
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// See SCLA 1.0: https://technosoftware.com/license/Source_Code_License_Agreement.pdf
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//
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// GNU General Public License as published by the Free Software Foundation;
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// version 3 of the License are accompanied with this source code.
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// See https://technosoftware.com/license/GPLv3License.txt
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//
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// This source code is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE.
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//-----------------------------------------------------------------------------
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#endregion Copyright (c) 2011-2023 Technosoftware GmbH. All rights reserved
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#region Using Directives
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using System;
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using Technosoftware.OpcRcw.Comn;
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#endregion
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namespace Technosoftware.DaAeHdaClient.Com
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{
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/// <summary>
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/// Adds and removes a connection point to a server.
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/// </summary>
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internal class ConnectionPoint : IDisposable
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{
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/// <summary>
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/// The COM server that supports connection points.
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/// </summary>
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private IConnectionPoint server_;
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/// <summary>
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/// The id assigned to the connection by the COM server.
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/// </summary>
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private int cookie_;
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/// <summary>
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/// The number of times Advise() has been called without a matching Unadvise().
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/// </summary>
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private int refs_;
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/// <summary>
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/// Initializes the object by finding the specified connection point.
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/// </summary>
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public ConnectionPoint(object server, Guid iid)
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{
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((IConnectionPointContainer)server).FindConnectionPoint(ref iid, out server_);
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}
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/// <summary>
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/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
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/// </summary>
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public void Dispose()
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{
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if (server_ != null)
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{
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while (Unadvise() > 0)
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{
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}
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try
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{
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Utilities.Interop.ReleaseServer(server_);
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}
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catch
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{
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// Ignore. COM Server probably no longer connected
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}
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server_ = null;
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}
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}
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/// <summary>
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/// The cookie returned in the advise call.
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/// </summary>
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public int Cookie => cookie_;
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//=====================================================================
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// IConnectionPoint
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/// <summary>
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/// Establishes a connection, if necessary and increments the reference count.
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/// </summary>
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public int Advise(object callback)
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{
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if (refs_++ == 0) server_.Advise(callback, out cookie_);
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return refs_;
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}
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/// <summary>
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/// Decrements the reference count and closes the connection if no more references.
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/// </summary>
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public int Unadvise()
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{
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if (--refs_ == 0) server_.Unadvise(cookie_);
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return refs_;
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}
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}
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}
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