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//
// System.Runtime.InteropServices/GCHandle.cs
//
// Authors:
// Ajay kumar Dwivedi (adwiv@yahoo.com) ??
// Paolo Molaro (lupus@ximian.com)
//
using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace System.Runtime.InteropServices
{
/// <summary>
/// Summary description for GCHandle.
/// </summary>
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");
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)
{
return new GCHandle (value);
}
[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);
}
}
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