I created a VB cOM dll with parameter list like:

myMethod(a as String)

Then I made a pointer to the COM object (used #import from
the MSKB article), and called the function as from VC like
this:

char* xyz = "aaaa";
ptr->myMethod(abc)
where abc is a BSTR from SysAllocString(xyz);

Compile error: SysAllocString' : cannot convert parameter
1 from 'const char *' to 'const unsigned short *

Same sort of error if I put in a CString in the Alloc
argument.
Help!

It's because SysAllocString doesn't want "char" it wants "WCHAR".

Try this:
WCHAR *  xyz = L"aaaa";

You might also want to try (not compiled):
CString str( "aaaa" );
ptr->myMethod( str.AllocSysString() );

--
russ.
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