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using System;
using System.Runtime.InteropServices;
using System.Reflection.Emit;
using DBus;
namespace DBus.DBusType
{
/// <summary>
/// An object path.
/// </summary>
public class ObjectPath : IDBusType
{
public const char Code = 'o';
private string path = null;
private object val = null;
private Service service = null;
private ObjectPath()
{
}
public ObjectPath(object val, Service service)
{
this.val = val;
this.service = service;
}
public ObjectPath(IntPtr iter, Service service)
{
IntPtr raw;
dbus_message_iter_get_basic (iter, out raw);
this.path = Marshal.PtrToStringAnsi (raw);
this.service = service;
}
private string Path
{
get {
if (this.path == null && this.val != null) {
Handler handler = this.service.GetHandler(this.val);
this.path = handler.Path;
}
return this.path;
}
}
public void Append(IntPtr iter)
{
IntPtr marshalVal = Marshal.StringToHGlobalAnsi (Path);
bool success = dbus_message_iter_append_basic (iter, (int) Code, ref marshalVal);
Marshal.FreeHGlobal (marshalVal);
if (!success)
throw new ApplicationException("Failed to append OBJECT_PATH argument:" + val);
}
public static bool Suits(System.Type type)
{
object[] attributes = type.GetCustomAttributes(typeof(InterfaceAttribute), false);
if (attributes.Length == 1) {
return true;
} else {
return false;
}
}
public static void EmitMarshalIn(ILGenerator generator, Type type)
{
if (type.IsByRef) {
generator.Emit(OpCodes.Ldind_Ref);
}
}
public static void EmitMarshalOut(ILGenerator generator, Type type, bool isReturn)
{
generator.Emit(OpCodes.Castclass, type);
if (!isReturn) {
generator.Emit(OpCodes.Stind_Ref);
}
}
public object Get()
{
throw new ArgumentException("Cannot call Get on an ObjectPath without specifying type.");
}
public object Get(System.Type type)
{
try {
return this.service.GetObject(type, Path);
} catch(Exception ex) {
throw new ArgumentException("Cannot cast object pointed to by Object Path to type '" + type.ToString() + "': " + ex);
}
}
[DllImport("dbus-1")]
private extern static void dbus_message_iter_get_basic (IntPtr iter, out IntPtr path);
[DllImport("dbus-1")]
private extern static bool dbus_message_iter_append_basic (IntPtr iter, int type, ref IntPtr path);
}
}
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