//
// System.Runtime.InteropServices.CustomMarshalers.EnumeratorToEnumVariantMarshaler
//
// Authors:
// Martin Willemoes Hansen (mwh@sysrq.dk)
// Jonathan Chambers (joncham@gmail.com)
//
// (C) 2003 Martin Willemoes Hansen
// (C) 2007 Jonathan Chambers
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace System.Runtime.InteropServices.CustomMarshalers{
public class EnumeratorToEnumVariantMarshaler : ICustomMarshaler
{
static EnumeratorToEnumVariantMarshaler instance;
public void CleanUpManagedData (object pManagedObj) {
throw new NotImplementedException ();
}
public void CleanUpNativeData (IntPtr pNativeData) {
Marshal.Release (pNativeData);
}
public static ICustomMarshaler GetInstance (string pstrCookie) {
if (instance == null)
instance = new EnumeratorToEnumVariantMarshaler ();
return instance;
}
public int GetNativeDataSize () {
throw new NotImplementedException ();
}
public IntPtr MarshalManagedToNative (object pManagedObj) {
throw new NotImplementedException ();
}
public object MarshalNativeToManaged (IntPtr pNativeData) {
IEnumVARIANT ienumvariant = (IEnumVARIANT)Marshal.GetObjectForIUnknown (pNativeData);
VARIANTEnumerator e = new VARIANTEnumerator (ienumvariant);
return e;
}
[ComImport]
[Guid ("00020404-0000-0000-C000-000000000046")]
[InterfaceType (ComInterfaceType.InterfaceIsIUnknown)]
interface IEnumVARIANT
{
[MethodImpl (MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void Next (int celt, [MarshalAs (UnmanagedType.Struct)]out object rgvar, out uint pceltFetched);
[MethodImpl (MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void Skip (uint celt);
[MethodImpl (MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void Reset ();
[return: MarshalAs (UnmanagedType.Interface)]
[MethodImpl (MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
IEnumVARIANT Clone ();
}
class VARIANTEnumerator : IEnumerator
{
IEnumVARIANT com_enum;
object current;
public VARIANTEnumerator (IEnumVARIANT com_enum) {
this.com_enum = com_enum;
}
#region IEnumerator Members
public object Current {
get {
return current;
}
}
public bool MoveNext () {
object val;
uint fetched = 0;
com_enum.Next (1, out val, out fetched);
if (fetched == 0)
return false;
current = val;
return true;
}
public void Reset () {
com_enum.Reset ();
}
#endregion
}
}
}
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