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//
// System.Runtime.InteropServices/GCHandle.cs
//
// Authors:
// Ajay kumar Dwivedi (adwiv@yahoo.com) ??
// Paolo Molaro (lupus@ximian.com)
//
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// 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.CompilerServices;
using System.Runtime.InteropServices;
namespace System.Runtime.InteropServices
{
#if NET_2_0
[ComVisible(true)]
#endif
[MonoTODO("Struct should be [StructLayout(LayoutKind.Sequential)] but will need to be reordered for that.")]
public struct GCHandle
{
// fields
private int handle;
private GCHandle(IntPtr h)
{
handle = (int)h;
}
// Constructors
private GCHandle(object obj)
: this(obj, GCHandleType.Normal)
{}
private GCHandle(object value, GCHandleType type)
{
handle = GetTargetHandle (value, 0, type);
}
// Properties
public bool IsAllocated
{
get
{
return (handle != 0);
}
}
public object Target
{
get
{
return GetTarget (handle);
}
set
{
handle = GetTargetHandle (value, handle, (GCHandleType)(-1));
}
}
// Methods
public IntPtr AddrOfPinnedObject()
{
IntPtr res = GetAddrOfPinnedObject(handle);
if (res == IntPtr.Zero)
throw new InvalidOperationException("The handle is not of Pinned type");
if (res == (IntPtr)(-1))
throw new ArgumentException ("Object contains non-primitive or non-blittable data.");
return res;
}
public static System.Runtime.InteropServices.GCHandle Alloc(object value)
{
return new GCHandle (value);
}
public static System.Runtime.InteropServices.GCHandle Alloc(object value, GCHandleType type)
{
return new GCHandle (value,type);
}
public void Free()
{
FreeHandle(handle);
handle = 0;
}
public static explicit operator IntPtr (GCHandle value)
{
return (IntPtr) value.handle;
}
public static explicit operator GCHandle(IntPtr value)
{
if (value == IntPtr.Zero)
throw new ArgumentException ("GCHandle value cannot be zero");
if (!CheckCurrentDomain ((int)value))
throw new ArgumentException ("GCHandle value belongs to a different domain");
return new GCHandle (value);
}
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern static bool CheckCurrentDomain (int handle);
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern static object GetTarget(int handle);
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern static int GetTargetHandle(object obj, int handle, GCHandleType type);
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern static void FreeHandle(int handle);
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern static IntPtr GetAddrOfPinnedObject(int handle);
#if NET_2_0
public static bool operator ==(GCHandle a, GCHandle b)
{
return a.Equals(b);
}
public static bool operator !=(GCHandle a, GCHandle b)
{
return (!(a.Equals(b)));
}
public override bool Equals(object o)
{
if (o == null || !(o is GCHandle))
return false;
return (handle == ((GCHandle)o).handle);
}
public override int GetHashCode()
{
return handle.GetHashCode ();
}
public static GCHandle FromIntPtr (IntPtr value)
{
return (GCHandle)value;
}
public static IntPtr ToIntPtr (GCHandle value)
{
return (IntPtr)value;
}
#endif
}
}
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