Re: VC++ .NET 2005 prepending underscore to external functions references

From:

"William DePalo [MVP VC++]" <willd.no.spam@mvps.org>

Newsgroups:

microsoft.public.vc.ide_general

Date:

Tue, 22 Aug 2006 18:34:58 -0400

Message-ID:

<uq2w1sjxGHA.1224@TK2MSFTNGP03.phx.gbl>

"Jett Gamboa" <jett@discussions.microsoft.com> wrote in message
news:OnJ4vVZxGHA.3936@TK2MSFTNGP04.phx.gbl...

I am trying to use a DLL built using a different a compiler. Under VC++
.NET 2003, I can build my program succesfully. Having recently upgraded to
VS.NET 2005, I created a new console C program and referenced the same
DLL. During the linking process however I am getting an "unresolved
external" error. I did a dumpbin on the obj file for my executable and
noticed that the external functions referenced have been prepended with an
underscore.

At the risk of asking the obvious - are you sure that you are using the same
sources?

If the sources are the same, if the extensions of the files are the same (.c
vs .cpp), if the declarations are the same - both or neither use extern "C",
both or neither use WINAPI ... etc then we can try to work backwards.

At the command line type

dumpin /exports yourDllNameGoesHere.DLL

and post the name for the unresolved external. If you do that someone will
may be able to tell you how to declare the imported function in VS 2005.

Regards,
Will