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using System;
using System.Runtime.InteropServices;
using System.Reflection.Emit;
using DBus;
namespace DBus.DBusType
{
/// <summary>
/// Marks a "void"/"unset"/"nonexistent"/"null" argument.
/// </summary>
public class Nil : IDBusType
{
public const char Code = 'v';
private Nil()
{
}
public Nil(object nil, Service service)
{
}
public Nil(IntPtr iter, Service service)
{
}
public void Append(IntPtr iter)
{
if (!dbus_message_iter_append_nil(iter))
throw new ApplicationException("Failed to append NIL argument");
}
public static bool Suits(System.Type type)
{
return false;
}
public static void EmitMarshalIn(ILGenerator generator, Type type)
{
if (type.IsByRef) {
generator.Emit(OpCodes.Ldind_I1);
}
}
public static void EmitMarshalOut(ILGenerator generator, Type type, bool isReturn)
{
generator.Emit(OpCodes.Unbox, type);
generator.Emit(OpCodes.Ldind_I1);
if (!isReturn) {
generator.Emit(OpCodes.Stind_I1);
}
}
public object Get()
{
return null;
}
public object Get(System.Type type)
{
throw new ArgumentException("Cannot cast DBus.Type.Nil to type '" + type.ToString() + "'");
}
[DllImport("dbus-1")]
private extern static bool dbus_message_iter_append_nil(IntPtr iter);
}
}
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