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<== Date ==> <== Thread ==>

Subject: pdbbase usage and scope
From: "Wells, Randall" <rwells@sandia.gov>
To: "'tech-talk@aps.anl.gov'" <tech-talk@aps.anl.gov>
Date: Wed, 23 Apr 2003 14:28:44 -0600
I am a new user of EPICS (3.14.1) on a win32(Win2K) platform.  I have
several client applications developed within the MSVC(6.0) IDE framework
that communicate using a similar framework.  I am in the early stages of
converting these applications to use EPICS Channel Access.  I have also
folded the example IOC program into an MFC application and hope to
incorporate some of the configuration and diagnostic tools that we have.  I
am able to initialize the IOC and access the data using channel access
clients.

As a learning exercise/proof of concept I want to duplicate part of the
iocsh call "dbl".  I am using the code in \base\src\db\dbtest.c as an
example.  I am having difficulty learning the scope and proper usage of
pdbbase.  I intend to do something along the lines of:

DBENTRY *pdbentry;
pdbentry=dbAllocEntry(pdbbase);
dbFirstRecordType(dbentry);
dbGetRecordName(dbentry);
....
dbFreeEntry(pdbentry);

My test program compiles, links, and serves channel access clients but I
have not been able to resolve the scope of pdbbase to another file within
the project

using:  extern DBBASE *pdbbase; results in the warning:  "inconsistent dll
linkage. dllexport assumed" with unresolved external symbol _pdbbase errors.

How should I handle this scope and what is proper usage of pdbbase?

What is:  "#define epicsExportSharedSymbols"?
Should I be using some sort of "#define epicsImportSharedSymbols"?  Is there
such a thing?

Any snippets of code that I could use as an example?

Thank you for your time.

Randy Wells
15425, Missile and Flight Systems
Sandia National Labs
Ph:  (505) 284-4849
Fax:  (505)  844-1168
e-mail:  rwells@sandia.gov



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