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I dont think, SAFEARRAY can be used in custom interfaces. I Think it
needs the typelibrary marshalling to help it out.  Why are you using
SAFEARRAY anyway? You can use size_is, length_is and other wonderful
attributes in IDL to pass arrays. 
Anyway, SAFEARRAY might work if you put that [oleautomation] attribute
on that interface.

David Morgenlender wrote:
> 
> I just implemented a new method in a custom interface in my inproc (DLL) COM
> server.  The IDL definition:
> 
>   HRESULT TestArray(
>         [in] SAFEARRAY(long) *ppsaIn,
>         [out] SAFEARRAY(long) *ppsaOut);
> 
> I get the identical error when I invoke this method from either Borland C++
> Builder 3 or Visual Basic 5:  0x800706e6, which is RPC_S_INTERNAL_ERROR.  A
> breakpoint in the method implementation is never reached.  So something seems to
> be going wrong within the guts of COM.  I can invoke other methods within this
> interface without any problems;  however, TestArray is the only method using
> SAFEARRAY arguments.
> 
> Everything is running under Win95.
> 
> Do you have any idea why I'm getting this error & how to fix it?
> 
> =======================================================
> Dave Morgenlender
> e-mail: dmorgen@alum.mit.edu
> =======================================================

-- 
Girish Bharadwaj [vc++/mvp]