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CppObjectShadow.cs
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80 lines (71 loc) · 2.94 KB
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// Copyright (c) 2010-2014 SharpDX - Alexandre Mutel
//
// 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.
using System;
using System.Runtime.InteropServices;
namespace SharpDX
{
/// <summary>
/// An Interface shadow callback
/// </summary>
internal abstract class CppObjectShadow : CppObject
{
/// <summary>
/// Gets the callback.
/// </summary>
public ICallbackable Callback { get; private set; }
/// <summary>
/// Gets the VTBL associated with this shadow instance.
/// </summary>
protected abstract CppObjectVtbl GetVtbl { get; }
/// <summary>
/// Initializes the specified shadow instance from a vtbl and a callback.
/// </summary>
/// <param name="callbackInstance">The callback.</param>
public unsafe virtual void Initialize(ICallbackable callbackInstance)
{
this.Callback = callbackInstance;
// Allocate ptr to vtbl + ptr to callback together
NativePointer = Marshal.AllocHGlobal(IntPtr.Size * 2);
var handle = GCHandle.Alloc(this);
Marshal.WriteIntPtr(NativePointer, GetVtbl.Pointer);
*((IntPtr*) NativePointer + 1) = GCHandle.ToIntPtr(handle);
}
protected unsafe override void Dispose(bool disposing)
{
if (NativePointer != IntPtr.Zero)
{
// Free the GCHandle
GCHandle.FromIntPtr(*(((IntPtr*)NativePointer) + 1)).Free();
// Free instance
Marshal.FreeHGlobal(NativePointer);
NativePointer = IntPtr.Zero;
}
Callback = null;
base.Dispose(disposing);
}
internal static T ToShadow<T>(IntPtr thisPtr) where T : CppObjectShadow
{
unsafe
{
return (T)GCHandle.FromIntPtr(*(((IntPtr*)thisPtr) + 1)).Target;
}
}
}
}