Hi everybody,

I am baffled by this problem and was hoping that somebody could help me out.
I have a COM DLL that was created by Delphi that I am calling indirectly
within my web service.  The WS is calling a .NET component that calls the
COM DLL.  I unit test the .NET component and it works fine. As soon as I
make calls from within the web service, I get the following error:

Unable to cast COM object of type 'ABDelphiLib.MathLibClass' to interface
type 'ABDelphiLib.IMathLib'. This operation failed because the
QueryInterface call on the COM component for the interface with IID
'{A48ACC15-ADCB-4759-BA41-C9541E97601E}' failed due to the following error:
No such interface supported (Exception from HRESULT: 0x80004002
(E_NOINTERFACE)).
Trace Information:     at ABDelphiLib.MathLibClass.RoundFloat(Double rInput,
Int32 iDigits)

I looked at the interop file that Visual Studio created, and it has the same
results as one that I would create with tblimp.  I made sure the interop
assembly is in the BIN directory of my web service app.  I also made sure
the native com component is in that directory, although it was already
registered with regsvr32.  I am running the tests against the same machine.

Why doesn't this work within the web service when it works when I test the
.Net assembly?

Thanks in advance,
cj