Problem in ole32.CoCreateInstance ?

Marcus Meissner marcus at
Mon May 5 00:58:19 CDT 2003

On Mon, May 05, 2003 at 07:09:07AM +0200, Sylvain Petreolle wrote:
> Sorry, I didnt notice that lpclf is the variables that receives the
> pointer.
> > Why not check why it's "always 0" for you, instead of complaining
> > that
> > it is? If the CoGetClassObject call can't obtain the class factory,
> > it's
> > usually because the registry entries are missing, incorrect, or the
> > referenced dll can't be loaded, but then it should have returned a
> > failure, and CoCreateInstance should then bail out before getting to
> > this point. You could also find out why it didn't, then?
> Yes, found it. The problem isnt in the macro. :)
> We should add a check in the case no class factory is found, to avoid
> crashing.
> But I dont understand why CoGetClassObject returns ok and leaves lpclf
> set to NULL.
> Adding a TRACE after CoGetClassObject I get :
> trace:ole:CoCreateInstance sanity check: hres=00000000, lpclf=00000000
> <= shouldnt happen.

Who is returning this hres 0x0 value? Which dll? Whoever it is, it is broken.

Ciao, Marcus

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