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Pippo · Guest

Hi to all, I've got a terrible problem.
I'm using a third party COM component (COM InProcess) in my
projects. I imported the type library and I use this
statement to create a new object instance:

pdisp.Bind("ProgID");
where ProgID is the COM ProgID I want to use.

Last week I received a new version of the DLL, I overwrote the
old one and my program doesn't work at all.
The COM exposes the same interfaces, I tried to debug the
previous instruction and I see that the problem is in this
part of code (from utilcls.h):

template <class DISPINTF> HRESULT
TAutoDriver<DISPINTF>::Bind(LPUNKNOWN punk)
{
_ASSERTE(punk /* Must bind to non-NULL interface pointer */);
HRESULT hr = E_POINTER;
if (punk)
{
DISPINTF *disp;
hr = punk->QueryInterface(__uuidof(DISPINTF), (LPVOID*)&disp);
if (SUCCEEDED(hr))
Bind(disp, false /* Don't AddRef */);
}
return hr;
}

the QueryInterface method fails. Is it possible
that IDispatch GUID is different from different versions
of the same component????
Is there a solution without re-importing the new component
type library???. I want that because my application runs over
computers that have the COM old version and other ones that
have the new version.
TIA.