148 lines
3.5 KiB
C#
Executable file
148 lines
3.5 KiB
C#
Executable file
// GLib.ManagedValue.cs : Managed types boxer
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//
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// Author: Rachel Hestilow <hestilow@ximian.com>
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//
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// Copyright (c) 2002 Rachel Hestilow
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of version 2 of the Lesser GNU General
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// Public License as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this program; if not, write to the
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// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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// Boston, MA 02111-1307, USA.
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namespace GLib {
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using System;
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using System.Runtime.InteropServices;
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using GLib;
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internal class ManagedValue {
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GCHandle gch;
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object instance;
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int ref_count = 1;
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private ManagedValue (object instance)
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{
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this.instance = instance;
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gch = GCHandle.Alloc (this);
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}
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IntPtr Handle {
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get { return (IntPtr) gch; }
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}
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object Instance {
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get { return instance; }
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}
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void Ref ()
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{
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ref_count++;
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}
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void Unref ()
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{
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if (--ref_count == 0) {
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instance = null;
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gch.Free ();
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}
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}
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[UnmanagedFunctionPointer (CallingConvention.Cdecl)]
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delegate IntPtr CopyFunc (IntPtr gch);
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[UnmanagedFunctionPointer (CallingConvention.Cdecl)]
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delegate void FreeFunc (IntPtr gch);
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static CopyFunc copy;
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static FreeFunc free;
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static GType boxed_type = GType.Invalid;
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delegate IntPtr d_g_boxed_type_register_static(IntPtr typename, CopyFunc copy_func, FreeFunc free_func);
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static d_g_boxed_type_register_static g_boxed_type_register_static = Marshal.GetDelegateForFunctionPointer<d_g_boxed_type_register_static>(FuncLoader.GetProcAddress(GLibrary.Load(Library.GObject), "g_boxed_type_register_static"));
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public static GType GType {
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get {
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if (boxed_type == GType.Invalid) {
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copy = new CopyFunc (Copy);
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free = new FreeFunc (Free);
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IntPtr name = Marshaller.StringToPtrGStrdup ("GtkSharpValue");
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boxed_type = new GLib.GType (g_boxed_type_register_static (name, copy, free));
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Marshaller.Free (name);
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}
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return boxed_type;
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}
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}
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static ManagedValue FromHandle (IntPtr ptr)
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{
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GCHandle gch = (GCHandle) ptr;
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ManagedValue val = gch.Target as ManagedValue;
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if (val == null)
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throw new Exception ("Unexpected GCHandle received.");
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return val;
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}
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static IntPtr Copy (IntPtr ptr)
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{
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try {
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if (ptr == IntPtr.Zero)
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return ptr;
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ManagedValue val = FromHandle (ptr);
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val.Ref ();
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return ptr;
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} catch (Exception e) {
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ExceptionManager.RaiseUnhandledException (e, false);
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}
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return IntPtr.Zero;
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}
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static void Free (IntPtr ptr)
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{
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try {
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if (ptr == IntPtr.Zero)
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return;
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ManagedValue val = FromHandle (ptr);
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val.Unref ();
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} catch (Exception e) {
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ExceptionManager.RaiseUnhandledException (e, false);
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}
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}
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public static IntPtr WrapObject (object obj)
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{
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if (obj == null)
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return IntPtr.Zero;
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return new ManagedValue (obj).Handle;
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}
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public static object ObjectForWrapper (IntPtr ptr)
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{
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if (ptr == IntPtr.Zero)
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return null;
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ManagedValue val = FromHandle (ptr);
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return val == null ? null : val.Instance;
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}
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public static void ReleaseWrapper (IntPtr ptr)
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{
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if (ptr == IntPtr.Zero)
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return;
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ManagedValue val = FromHandle (ptr);
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val.Unref ();
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}
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}
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}
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