[Mono-dev] Status of COM interop

Jonathan Chambers joncham at gmail.com
Tue Apr 26 17:13:40 EDT 2011


Both RCWs and CCWs should be working in mono. Please post more details of
the issues you are hitting. I am using both RCWs and CCWs extensively in my

The InterfaceType attribute is interesting. I believe interfaces are dual by
default (IDispatch based with a vtable), so if your interfaces really are
dual this should work.


On Tue, Apr 26, 2011 at 4:47 PM, Ivo Smits <Ivo at ufo-net.nl> wrote:

> In Mono COM/XPCOM interop, Runtime Callable Wrappers appear to be
> implemented and work correctly with VirtualBox, although it's not
> directly compatible with COM interop in the Microsoft .Net runtime: the
> interop assemblies generated by VS.Net cause crashes (segmentation
> fault) and for interfaces written in C#, Mono needs the
> [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] attribute on the
> interfaces, while this attribute breaks the interface in MS .Net. If
> anyone has more information, or would like to have more information, let
> me know. For now, I will work around this by using different, equally
> named interop assemblies exposing the same interfaces.
> I have not been able to get COM Callable Wrappers to work yet. I can get
> an IUnknown interface pointer for the managed object (using
> Marshal.GetIUnknownForObject), I can use Marshal.AddRef on this pointer,
> and I can pass this pointer to the COM code. Presumably when the COM
> code makes a call on the CCW interface, a segmentation fault occurs.
> This is still pretty much a black box for me, so before I investigate
> any further: have CCWs been implemented in Mono and are they supposed to
> work? Has anyone successfully used them?
> The stack trace of the crash is short and not very useful:
> Native stacktrace:
> Segmentatiefout
> --
> Ivo
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