Experimental Physics and
Industrial Control System

"Russ Berg" <[email protected]> · Fri, 9 Jan 2004 09:17:59 -0600

Hi Steve, 
I just added dbf_type_to_DBR_TIME to a project that I have been working
on and it linked up fine, I stepped through the call and it is using
dbf_text_dim instead of _dbf_text_dim, so my thought is that you may
have a name mangling issue. I am using Borland C++ Builder 6 and I have
to import the DLL to a .lib file before I can use it, in that process I
handle the name mangling. The import utils are implib and impdef, both
come with cppbuilder. 

In case your interested here is a help dump of each:

H:\>impdef

Borland Impdef Version 3.0.22 Copyright (c) 1991, 2000 Inprise
Corporation

Syntax: IMPDEF [options] destname[.def] srcname[.dll]
Options:
    -a     Add '_' alias for MS flavor cdecl functions
    -h     Emit hints

H:\>implib

Borland Implib Version 3.0.22 Copyright (c) 1991, 2000 Inprise
Corporation

Syntax: IMPLIB [options] libname[.lib] [@respfile | srcname] [srcname
....]
 Options:
    -a     Add '_' alias for MS flavor cdecl functions
    -c     Case sensitive symbols
    -f     Force imports by name (with hints)
    -w     No Warnings

Respfile may contain a list of source files to process.
Wildcards are ok for .DLL and .DEF file names.

-Russ

-----Original Message-----
From: Jeff Hill [mailto:[email protected]] 
Sent: Thursday, January 08, 2004 4:55 PM
To: [email protected]; [email protected]
Subject: RE: Problem linking a Channel Access application on Windows
using Visual Studio

Steve,

The file README.WIN32 in the R3.14.4 distribution has a discussion about
building application outside of the EPICS build system. Read section (6)
for the details. Let me know if you are still experiencing troubles.

Jeff

> -----Original Message-----
> From: [email protected] [mailto:[email protected]]
> Sent: Tuesday, January 06, 2004 10:06 PM
> To: [email protected]
> Subject: Problem linking a Channel Access application on Windows using

> Visual Studio
> 
> G'day,
> 
> I'm hoping that someone can help me with a problem I'm having with 
> linking a Channel Access (3.14.4) program that I'm writing on windows 
> 2000 using Visual Studio C++ Version 6.0.
> 
> Everything was compiling and linking fine (using a variety of 
> different Channel Access functions) until I found that I needed to use

> the dbf_type_to_DBR_TIME macro which is defined in db_access.h.  At 
> this point, attempting to link the application resulted in the 
> following error:
> 
> ============================================================
> --------------------Configuration: mcatest - Win32
> Debug--------------------
> Linking...
> Channel.obj : error LNK2001: unresolved external symbol _dbf_text_dim 
> Debug/mcatest.exe : fatal error LNK1120: 1 unresolved externals Error 
> executing link.exe.
> 
> mcatest.exe - 2 error(s), 0 warning(s) 
> ============================================================
> 
> The symbol dbf_text_dim is used by the macro dbf_type_to_DBR_TIME and 
> is defined in access.cpp.  I've checked with the Visual Studio 
> Dependency Walker and have verified that dbf_text_dim is in the ca.dll

> and ca.lib files.
> 
> I am at a loss to understand why the linker cannot resolve this 
> symbol. Is there anyone out there who can tell me what I need to do to

> get my application to link correctly so that I can use the 
> dbf_type_to_DBR_TIME macro?
> 
> Steve Banks
> Australian Synchrotron Project
> Department of Infrastructure
> Level 18, 80 Collins Street
> Melbourne   VIC   3000
> tel:  +613 9655 6303
> fax:  +613 9655 8666
> web: www.synchrotron.vic.gov.au

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System