Hi i have an application hosting webbrowser control in design mode. I also
wrote a custom OleUndoManger. My problem is if I move or resize a html
element the application crashes. With NullPointerException.

Can anybody check if the definition is correct?

TIA dom

Please respond on
    d-dot-mohl-at-hico-dot-com

Here is my definition of the ole interfaces:

[ComVisible(true), Guid("B3E7C340-EF97-11CE-9BC9-00AA00608E01"),
InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IEnumOleUndoUnits {
   [return: MarshalAs(UnmanagedType.I4)]
   [PreserveSig]
   int Next(
   [In, MarshalAs(UnmanagedType.U4)]
   int numDesired,
   [Out, MarshalAs(UnmanagedType.Interface)]
   out IOleUndoUnit unit,
   [Out, MarshalAs(UnmanagedType.U4)]
   out int numReceived);

[PreserveSig]
int Skip(
   [In, MarshalAs(UnmanagedType.I4)]
   int numToSkip);

[PreserveSig]
   int Reset();

[PreserveSig]
int Clone(
   [Out, MarshalAs(UnmanagedType.Interface)]
   out IEnumOleUndoUnits enumerator);
};

[ComVisible(true), Guid("A1FAF330-EF97-11CE-9BC9-00AA00608E01"),
InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
public interface IOleParentUndoUnit : IOleUndoUnit {
[return: MarshalAs(UnmanagedType.I4)]
[PreserveSig]
int Open(
[In, MarshalAs(UnmanagedType.Interface)]
IOleParentUndoUnit parentUnit);
[return: MarshalAs(UnmanagedType.I4)]
[PreserveSig]
int Close(
[In, MarshalAs(UnmanagedType.Interface)]
IOleParentUndoUnit parentUnit,
[In, MarshalAs(UnmanagedType.Bool)]
bool fCommit);
[return: MarshalAs(UnmanagedType.I4)]
[PreserveSig]
int Add(
[In, MarshalAs(UnmanagedType.Interface)]
IOleUndoUnit undoUnit);
[return: MarshalAs(UnmanagedType.I4)]
[PreserveSig]
int FindUnit(
[In, MarshalAs(UnmanagedType.Interface)]
IOleUndoUnit undoUnit);
[return: MarshalAs(UnmanagedType.I4)]
[PreserveSig]
int GetParentState(
[Out, MarshalAs(UnmanagedType.I4)]
out int state
);
}
[ComVisible(true), ComImport(),
Guid("6D5140C1-7436-11CE-8034-00AA006009FA"),
InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
public interface IOleServiceProvider {
[return: MarshalAs(UnmanagedType.I4)]
[PreserveSig]
int QueryService(
[In] ref Guid guidService,
[In] ref Guid riid,
out IntPtr ppvObject);
}
[ComVisible(true), Guid("D001F200-EF97-11CE-9BC9-00AA00608E01"),
InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
public interface IOleUndoManager {
[PreserveSig]
int Open(
[In, MarshalAs(UnmanagedType.Interface)]
IOleParentUndoUnit parentUndo);
[PreserveSig]
int Close(
[In, MarshalAs(UnmanagedType.Interface)]
IOleParentUndoUnit parentUndo,
[In, MarshalAs(UnmanagedType.Bool)]
bool fCommit);
[PreserveSig]
int Add(
[In, MarshalAs(UnmanagedType.Interface)]
IOleUndoUnit undoUnit);
[return: MarshalAs(UnmanagedType.I4)]
int GetOpenParentState();
[PreserveSig]
int DiscardFrom(
[In, MarshalAs(UnmanagedType.Interface)]
IOleUndoUnit undoUnit);
void UndoTo(
[In, MarshalAs(UnmanagedType.Interface)]
IOleUndoUnit undoUnit);
void RedoTo(
[In, MarshalAs(UnmanagedType.Interface)]
IOleUndoUnit undoUnit);
[return: MarshalAs(UnmanagedType.Interface)]
IEnumOleUndoUnits EnumUndoable();
[return: MarshalAs(UnmanagedType.Interface)]
IEnumOleUndoUnits EnumRedoable();
[return: MarshalAs(UnmanagedType.BStr)]
string GetLastUndoDescription();
[return: MarshalAs(UnmanagedType.BStr)]
string GetLastRedoDescription();
void Enable(
[In, MarshalAs(UnmanagedType.Bool)]
bool fEnable);
}
[ComVisible(true), Guid("894AD3B0-EF97-11CE-9BC9-00AA00608E01"),
InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
public interface IOleUndoUnit {
[return: MarshalAs(UnmanagedType.I4)]
[PreserveSig]
int Do(
[In, MarshalAs(UnmanagedType.Interface)]
IOleUndoManager undoManager);
[return: MarshalAs(UnmanagedType.I4)]
[PreserveSig]
int GetDescription(
[Out, MarshalAs(UnmanagedType.BStr)]
out string bStr);
[return: MarshalAs(UnmanagedType.I4)]
[PreserveSig]
int GetUnitType(
[Out]
out Guid clsid,
[Out, MarshalAs(UnmanagedType.I4)]
out int plID);
[return: MarshalAs(UnmanagedType.I4)]
[PreserveSig]
int OnNextAdd();
}