mirror of https://github.com/dahall/Vanara.git
67 lines
3.0 KiB
C#
67 lines
3.0 KiB
C#
using System.Collections.Generic;
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using System.Linq;
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using System.Runtime.InteropServices.ComTypes;
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namespace Vanara.InteropServices;
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/// <summary>
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/// Helper class to create an advised COM sink. When this class is constructed, the source is queried for an <see
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/// cref="IConnectionPointContainer"/> reference.
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/// </summary>
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public class ComConnectionPoint : IDisposable
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{
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private readonly List<(IConnectionPoint, int)> connectionPoints = new();
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/// <summary>Initializes a new instance of the <see cref="ComConnectionPoint"/> class.</summary>
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/// <param name="source">The COM object from which to query the <see cref="IConnectionPointContainer"/> reference.</param>
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/// <param name="sink">The object which implements the COM interface or interfaces signaled by an event.</param>
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/// <param name="interfaces">The interfaces supported by <paramref name="source"/> that support events.</param>
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public ComConnectionPoint(object source, object? sink, params Type[]? interfaces)
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{
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if (source is not IConnectionPointContainer connectionPointContainer)
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throw new ArgumentException("The source object must be COM object that supports the IConnectionPointContainer interface.", nameof(source));
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Sink = sink ?? this;
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interfaces ??= GetComInterfaces(Sink);
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if (interfaces is null || interfaces.Length < 1) throw new ArgumentOutOfRangeException(nameof(interfaces));
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// Start the event sink
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foreach (var i in interfaces)
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{
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var comappEventsInterfaceId = i.GUID;
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connectionPointContainer.FindConnectionPoint(ref comappEventsInterfaceId, out var connectionPoint);
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if (connectionPoint != null)
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{
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connectionPoint.Advise(Sink, out var cookie);
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connectionPoints.Add((connectionPoint, cookie));
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}
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}
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}
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/// <summary>Initializes a new instance of the <see cref="ComConnectionPoint"/> class.</summary>
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/// <param name="source">The COM object from which to query the <see cref="IConnectionPointContainer"/> reference.</param>
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/// <param name="sink">
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/// The object which implements the COM interface or interfaces signaled by an event. All COM interfaces implemented by this object will
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/// be used to setup the connection points. If this object implements COM interfaces that cannot be used as connection points, use the
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/// constructor that allows for supported interfaces to be specified.
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/// </param>
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public ComConnectionPoint(object source, object? sink) : this(source, sink, null) { }
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/// <summary>Gets the sink.</summary>
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/// <value>The sink.</value>
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public object Sink { get; private set; }
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/// <summary>Releases unmanaged and - optionally - managed resources.</summary>
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public void Dispose()
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{
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foreach (var pair in connectionPoints)
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{
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//unhook the event sink
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pair.Item1.Unadvise(pair.Item2);
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}
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connectionPoints.Clear();
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}
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private static Type[]? GetComInterfaces(object? sink) => sink?.GetType().GetInterfaces().
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Where(i => i.GetCustomAttributes(true).Any(a => a.GetType() == typeof(ComImportAttribute) || a.GetType() == typeof(InterfaceTypeAttribute))).
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ToArray();
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} |