268 lines
7.3 KiB
C#
268 lines
7.3 KiB
C#
//
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// System.__ComObject
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//
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// Authors:
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// Sebastien Pouliot <sebastien@ximian.com>
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// Kornél Pál <http://www.kornelpal.hu/>
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// Jonathan Chambers <joncham@gmail.com>
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//
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// Copyright (C) 2004 Novell (http://www.novell.com)
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// Copyright (C) 2005 Kornél Pál
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// Copyright (C) 2006 Jonathan Chambers
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//
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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#if !FULL_AOT_RUNTIME
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using Mono.Interop;
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using System.Collections;
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using System.Runtime.InteropServices;
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using System.Runtime.CompilerServices;
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using System.Threading;
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namespace System
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{
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// This is a private class that is used as a generic wrapper class
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// for COM objects that have no specific wrapper class.
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//
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// It has no public methods, it's functionality is exposed trough
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// System.Runtime.InteropServices.Marshal class and can be casted to
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// any interface that is implemented by the wrapped COM object.
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//
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// This class is referenced in .NET Framework SDK Documentation so
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// many times that obj.GetType().FullName == "System.__ComObject" and
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// Type.GetType("System.__ComObject") may be used.
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[StructLayout (LayoutKind.Sequential)]
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internal class __ComObject : MarshalByRefObject
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{
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#pragma warning disable 169
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#region Sync with object-internals.h
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IntPtr iunknown;
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IntPtr hash_table;
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SynchronizationContext synchronization_context;
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#endregion
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#pragma warning restore 169
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// keep a reference to the proxy so it doesn't get garbage collected before the RCW
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ComInteropProxy proxy;
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[MethodImplAttribute (MethodImplOptions.InternalCall)]
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internal static extern __ComObject CreateRCW (Type t);
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[MethodImplAttribute (MethodImplOptions.InternalCall)]
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private extern void ReleaseInterfaces ();
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~__ComObject ()
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{
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if (hash_table != IntPtr.Zero) {
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if (synchronization_context != null)
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synchronization_context.Post ((state) => ReleaseInterfaces (), this);
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else
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ReleaseInterfaces ();
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}
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proxy = null;
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}
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public __ComObject ()
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{
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Initialize (GetType ());
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}
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internal __ComObject (Type t) {
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Initialize (t);
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}
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internal __ComObject (IntPtr pItf, ComInteropProxy p)
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{
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proxy = p;
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InitializeApartmentDetails ();
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Guid iid = IID_IUnknown;
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int hr = Marshal.QueryInterface (pItf, ref iid, out iunknown);
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Marshal.ThrowExceptionForHR (hr);
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}
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internal void Initialize (IntPtr pUnk, ComInteropProxy p)
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{
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proxy = p;
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InitializeApartmentDetails ();
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iunknown = pUnk;
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}
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internal void Initialize (Type t)
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{
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InitializeApartmentDetails ();
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// Guard multiple invocation.
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if (iunknown != IntPtr.Zero)
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return;
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iunknown = CreateIUnknown (t);
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}
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internal static IntPtr CreateIUnknown(Type t)
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{
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System.Runtime.CompilerServices.RuntimeHelpers.RunClassConstructor (t.TypeHandle);
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IntPtr iunknown;
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ObjectCreationDelegate ocd = ExtensibleClassFactory.GetObjectCreationCallback (t);
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if (ocd != null) {
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iunknown = ocd (IntPtr.Zero);
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if (iunknown == IntPtr.Zero)
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throw new COMException (string.Format("ObjectCreationDelegate for type {0} failed to return a valid COM object", t));
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}
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else {
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int hr = CoCreateInstance (GetCLSID (t), IntPtr.Zero, 0x1 | 0x4 | 0x10, IID_IUnknown, out iunknown);
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Marshal.ThrowExceptionForHR (hr);
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}
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return iunknown;
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}
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private void InitializeApartmentDetails ()
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{
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// Only synchronization_context if thread is STA.
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if (Thread.CurrentThread.GetApartmentState() != ApartmentState.STA)
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return;
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synchronization_context = SynchronizationContext.Current;
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// Check whether the current context is a plain SynchronizationContext object
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// and handle this as if no context was set at all.
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if (synchronization_context != null &&
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synchronization_context.GetType () == typeof(SynchronizationContext))
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synchronization_context = null;
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}
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private static Guid GetCLSID (Type t)
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{
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if (t.IsImport)
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return t.GUID;
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// look at supertypes
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Type super = t.BaseType;
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while (super != typeof (object)) {
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if (super.IsImport)
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return super.GUID;
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super = super.BaseType;
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}
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throw new COMException ("Could not find base COM type for type " + t.ToString());
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}
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[MethodImplAttribute (MethodImplOptions.InternalCall)]
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internal extern IntPtr GetInterfaceInternal (Type t, bool throwException);
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internal IntPtr GetInterface (Type t, bool throwException) {
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CheckIUnknown ();
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return GetInterfaceInternal (t, throwException);
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}
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internal IntPtr GetInterface(Type t)
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{
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return GetInterface (t, true);
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}
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private void CheckIUnknown ()
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{
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if (iunknown == IntPtr.Zero)
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throw new InvalidComObjectException ("COM object that has been separated from its underlying RCW cannot be used.");
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}
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internal IntPtr IUnknown
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{
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get
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{
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if (iunknown == IntPtr.Zero)
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throw new InvalidComObjectException ("COM object that has been separated from its underlying RCW cannot be used.");
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return iunknown;
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}
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}
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internal IntPtr IDispatch
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{
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get
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{
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IntPtr pUnk = GetInterface (typeof (IDispatch));
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if (pUnk == IntPtr.Zero)
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throw new InvalidComObjectException ("COM object that has been separated from its underlying RCW cannot be used.");
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return pUnk;
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}
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}
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internal static Guid IID_IUnknown
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{
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get
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{
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return new Guid("00000000-0000-0000-C000-000000000046");
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}
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}
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internal static Guid IID_IDispatch
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{
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get
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{
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return new Guid ("00020400-0000-0000-C000-000000000046");
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}
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}
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public override bool Equals (object obj)
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{
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CheckIUnknown ();
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if (obj == null)
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return false;
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__ComObject co = obj as __ComObject;
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if ((object)co == null)
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return false;
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return (iunknown == co.IUnknown);
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}
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public override int GetHashCode ()
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{
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CheckIUnknown ();
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// not what MS seems to do,
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// but IUnknown is identity in COM
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return iunknown.ToInt32 ();
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}
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[DllImport ("ole32.dll", CallingConvention = CallingConvention.StdCall, ExactSpelling = true, PreserveSig = true)]
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static extern int CoCreateInstance (
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[In, MarshalAs (UnmanagedType.LPStruct)] Guid rclsid,
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IntPtr pUnkOuter,
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uint dwClsContext,
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[In, MarshalAs (UnmanagedType.LPStruct)] Guid riid,
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out IntPtr pUnk);
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}
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}
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#else
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namespace System
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{
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// this is a shim class so we can AOT during full AOT builds without --enable-minimal=com
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internal class __ComObject
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{
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__ComObject ()
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{
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throw new NotSupportedException ();
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}
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}
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}
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#endif
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