GtkSharp/glib/time_t_CustomMarshaler.cs

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// time_t_CustomMarshaler.cs - Custom marshaling between time_t and DateTime
//
// Author: Mike Kestner <mkestner@ximian.com>
//
// Copyright (c) 2004 Novell, Inc.
namespace GLib {
using System;
using System.Runtime.InteropServices;
public class time_t_CustomMarshaler : ICustomMarshaler {
static time_t_CustomMarshaler marshaler;
int utc_offset;
DateTime local_epoch;
private time_t_CustomMarshaler ()
{
utc_offset = DateTime.Now.Subtract (DateTime.UtcNow).Seconds;
local_epoch = new DateTime (1970, 1, 1, 0, 0, 0);
}
public static ICustomMarshaler GetInstance (string cookie)
{
if (marshaler == null)
marshaler = new time_t_CustomMarshaler ();
return marshaler;
}
[DllImport ("gtksharpglue")]
static extern int gtksharp_time_t_sizeof ();
[DllImport ("gtksharpglue")]
static extern void gtksharp_time_t_print (int time_t);
public IntPtr MarshalManagedToNative (object obj)
{
DateTime dt = (DateTime) obj;
int size = Marshal.SizeOf (typeof (int)) + gtksharp_time_t_sizeof ();
IntPtr ptr = Marshal.AllocCoTaskMem (size);
IntPtr time_t_ptr = new IntPtr (ptr.ToInt32 () + Marshal.SizeOf (typeof(int)));
int secs = dt.Subtract (local_epoch).Seconds + utc_offset;
Console.WriteLine ("Marshaling DateTime: " + dt);
Marshal.WriteInt32 (time_t_ptr, secs);
gtksharp_time_t_print (secs);
return time_t_ptr;
}
public void CleanUpNativeData (IntPtr data)
{
IntPtr ptr = new IntPtr (data.ToInt32 () - Marshal.SizeOf (typeof (int)));
Marshal.FreeCoTaskMem (ptr);
}
public object MarshalNativeToManaged (IntPtr data)
{
throw new NotImplementedException ();
}
public void CleanUpManagedData (object obj) {}
public int GetNativeDataSize ()
{
throw new NotImplementedException ();
}
}
}