[Mono-bugs] [Bug 517855] Invoking methods via Reflection that have COM objects as parameters throws MissingMethodException in mono.

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http://bugzilla.novell.com/show_bug.cgi?id=517855

User tom_hindle at sil.org added comment
http://bugzilla.novell.com/show_bug.cgi?id=517855#c4





--- Comment #4 from tom hindle <tom_hindle at sil.org>  2009-11-11 13:18:02 MST ---
Ok, attempted to do this in two different ways both seem to work equally well
and pass my tests.

#if true
    if (objArgs != null &&(objArgs[j] is __ComObject))
    {
        IntPtr comInterface;
        Guid g = Marshal.GenerateGuidForType(args [j].ParameterType);
        if (g != Guid.Empty &&
Marshal.QueryInterface(Marshal.GetIUnknownForObject(objArgs[j]), ref g, out
comInterface) == 0 /* S_OK */) 
        {
            Marshal.Release(comInterface);
            continue; // Parameter is implemented by ComObject
        }
    }
#else
    if (objArgs != null && (objArgs[j] is __ComObject))
    {                         
        IntPtr comInterface = Marshal.GetComInterfaceForObject(objArgs[j], args
[j].ParameterType);
        if (comInterface != null)
        {
            Marshal.Release(comInterface);
            continue; // ParameterType is implemented by ComObject
        }
    }
#endif

I think I am going to pick the first implementation with QueryInterface as I
guess its quicker.

Attaching patch shortly as soon as rebuilt and retested everything.

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