Re: A simple question

"Igor Tandetnik" <>
Fri, 1 Dec 2006 11:35:19 -0500
<#Dl5xaWFHHA.1232@TK2MSFTNGP05.phx.gbl> wrote:

I have never had any experience of using COM objects but this is the
situation I am currently in:

!) I have received from a 3rd party a DLL that contains a COM object.
I have installed using RegSvr32. The 3rd party did not include any
additional files with the DLL (e.g. a .lib file).
2) I am then using some sample code that they sent us and after a
little re-jiggin this all compiles fine.
3) When I attempt to build the application I get an unresolved symbol
error, referencing the QueryInterface function of the COM object.

QueryInterface is a virtual function, linker should not even be
involved. Show some code.

Can anybody please tell me anything about this and where I could be
going wrong? Or is it down to the 3rd party to supply me with a .lib
file as well?

No, you should not need anything besides the DLL itself, and the type
library they helpfully supplied with it (it's bound to the DLL as a
resource, that's what #import directive actually reads).
With best wishes,
    Igor Tandetnik

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