Hey all. I have a problem with my implimentation of IHTMLElementCollection
which I have defined like so:

[ComVisible(true), Guid("3050f21f-98b5-11cf-bb82-00aa00bdce0b"),

InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIDispatch),

TypeLibType(TypeLibTypeFlags.FDual | TypeLibTypeFlags.FDispatchable)]

public interface IHTMLElementCollection : IEnumerable{

[DispId(HTMLConsts.DISPID_IHTMLELEMENTCOLLECTION_TOSTRING)]

[return: MarshalAs(UnmanagedType.BStr)]

string ToString();

[DispId(HTMLConsts.DISPID_IHTMLELEMENTCOLLECTION_LENGTH)]

int Length {get;}

[DispId(HTMLConsts.DISPID_IHTMLELEMENTCOLLECTION__NEWENUM)]

[return: MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef =
typeof(EnumeratorToEnumVariantMarshaler))]

new IEnumerator GetEnumerator();



[DispId(HTMLConsts.DISPID_IHTMLELEMENTCOLLECTION_ITEM)]

[return: MarshalAs(UnmanagedType.IDispatch)]

IHTMLElement Item([In] int Index);

[DispId(HTMLConsts.DISPID_IHTMLELEMENTCOLLECTION_ITEM)]

[return: MarshalAs(UnmanagedType.IDispatch)]

IHTMLElement Item([In, MarshalAs(UnmanagedType.BStr)] string Name);

[DispId(HTMLConsts.DISPID_IHTMLELEMENTCOLLECTION_TAGS)]

[return: MarshalAs(UnmanagedType.Interface)]

object Tags([In, MarshalAs(UnmanagedType.BStr)] string TagName);

}



The problem is that I end up with a non-trappable error (that just results
in termination of that function) when I try to access any of the Items or
the Enumerator itself.

Anyone have any ideas as to what I'm doing wrong?

Thanks!

James Hancock

Ok, thanks for your help!

What about this now:
[DispId(HTMLConsts.DISPID_IHTMLELEMENT_TAGNAME)]

string TagName{[return: MarshalAs(UnmanagedType.BStr)] get;}

I get the same sort of error when I do Element.TagName...

Thanks!

James Hancock



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Hi James,

[...]
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[...]
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You have 2 Items, both wrongly declared. Use that instead:

[DispId(HTMLConsts.DISPID_IHTMLELEMENTCOLLECTION_ITEM)]
[return: MarshalAs(UnmanagedType.IDispatch)]
IHTMLElement Item(
[In, Optional, MarshalAs(UnmanagedType.Struct)]
object name,
[In, Optional, MarshalAs(UnmanagedType.Struct)]
object index
);

bye

Hi James,

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Hmm, it looks ok to me. Please chech the order of the
members you declared. They must exactly match the
order of the IHTMLElement IDL.

bye

It looks like it still has something to do with the enumeration. Because if
I use the IHTMLElement definition outside the enumeration from another
source it's fine...

I'll check your suggestion.

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