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[Linker error] Unresolved external "..."

Posted on 2004-04-20
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Last Modified: 2013-11-17
I'm building a Win32 app using functions from WinPcap (http://winpcap.polito.it) to low-level access to Ethernet adapters.
I'm new to C++ Builder (i've ever used C over Linux), but i think it's almost right...

Everything compiles fine, but when linking i get the error:

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[Linker error] Unresolved external '_PacketGetAdapterNames' referenced from \...path...\UNIT2.OBJ
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I've installed both developers' pack and source code, but still there...

Can someone help?

Thanx all
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Question by:Kkto
7 Comments
 
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by:SteH
ID: 10869504
You need a library with contains a function _PacketGetAdapterNames (). This is defined in packet32.h and is part of the packet.dll. So the code of the function is in an external file which won't be part of your executable. So the executable has to get to know how to call the function. Either link with packet.lib (or you need to load the dll and ask the function address from it to call it via a pointer set to that address).
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Expert Comment

by:Cayce
ID: 10869830
You need to IMPLIB packet.dll, then use the resulting  .LIB file on your project. That will solve the problem.

command:
c:\> IMPLIB Packet.LIB PACKET.DLL

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by:Kkto
ID: 10878755
Finally i found out...

packet.dll is  compiled with MS Visual C++, while i'm using Borland C++ Builder; and that's all the trick.

In this case a "translation" is needed to let Borland Builder understand the LIBs from MSVC. All the proccess is located at http://www.bcbdev.com/articles/vcdll.htm

Thanx for your tips :D
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by:SteH
ID: 10880294
No objection.
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by:Cayce
ID: 10894545
Yeah, No objection
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Accepted Solution

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modulo earned 0 total points
ID: 10894722
PAQ-ing the question and refunding 500  points

Thanks Cayce and SteH !

modulo

Community Support Moderator
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