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Register COM server types attached to the callers' threading model
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Manuel Leßmann
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Manuel Leßmann
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Nov 30, 2023
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// The MIT License (MIT) | ||
// Copyright (c) Microsoft Corporation | ||
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// 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: | ||
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// The above copyright notice and this permission notice shall be included in all copies or substantial | ||
// portions of the Software. | ||
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// 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. | ||
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using System.Runtime.InteropServices; | ||
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namespace dSPACE.Runtime.InteropServices; | ||
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[ComVisible(true)] | ||
internal sealed class STAClassFactory<T> : StandardOleMarshalObject, IClassFactory where T : new() | ||
{ | ||
public void CreateInstance( | ||
[MarshalAs(UnmanagedType.Interface)] object instancePointer, | ||
ref Guid riid, | ||
out IntPtr outInterfacePointFromClass) | ||
{ | ||
var interfaceType = GetInterfaceFromClassType(typeof(T), ref riid, instancePointer); | ||
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object aggregatedObject = new T(); | ||
if (instancePointer != null) | ||
{ | ||
aggregatedObject = CreateAggregatedObject(instancePointer, aggregatedObject); | ||
} | ||
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outInterfacePointFromClass = GetObjectAsInterface(aggregatedObject, interfaceType); | ||
} | ||
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public void LockServer([MarshalAs(UnmanagedType.Bool)] bool fLock) { } | ||
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private static Type GetInterfaceFromClassType(Type classType, ref Guid riid, object outer) | ||
{ | ||
if (riid == new Guid(Guids.IID_IUnknown)) | ||
{ | ||
return typeof(object); | ||
} | ||
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if (outer != null) | ||
{ | ||
throw new COMException(string.Empty, HRESULT.CLASS_E_NOAGGREGATION); | ||
} | ||
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foreach (var i in classType.GetInterfaces()) | ||
{ | ||
if (i.GUID == riid) | ||
{ | ||
return i; | ||
} | ||
} | ||
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throw new InvalidCastException(); | ||
} | ||
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private static IntPtr GetObjectAsInterface(object obj, Type interfaceType) | ||
{ | ||
if (interfaceType == typeof(object)) | ||
{ | ||
return Marshal.GetIUnknownForObject(obj); | ||
} | ||
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var interfaceMaybe = Marshal.GetComInterfaceForObject(obj, interfaceType, CustomQueryInterfaceMode.Ignore); | ||
if (interfaceMaybe == IntPtr.Zero) | ||
{ | ||
throw new InvalidCastException(); | ||
} | ||
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return interfaceMaybe; | ||
} | ||
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private static object CreateAggregatedObject(object pUnkOuter, object comObject) | ||
{ | ||
var outerPtr = Marshal.GetIUnknownForObject(pUnkOuter); | ||
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try | ||
{ | ||
var innerPtr = Marshal.CreateAggregatedObject(outerPtr, comObject); | ||
return Marshal.GetObjectForIUnknown(innerPtr); | ||
} | ||
finally | ||
{ | ||
Marshal.Release(outerPtr); | ||
} | ||
} | ||
} |