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Re: [Linker Error] Unresolved external

From: Graf László <graf(dot)laszlo(at)axis(dot)hu>
To: Magnus Hagander <mha(at)sollentuna(dot)net>,pgsql-hackers-win32(at)postgresql(dot)org
Subject: Re: [Linker Error] Unresolved external
Date: 2004-12-06 12:01:12
Message-ID: 41B44A08.4020108@axis.hu (view raw or flat)
Thread:
Lists: pgsql-hackers-win32
I got the 8.0 release but it do not contain include files
only dlls in the lib forder.

Magnus Hagander wrote:
> You need to link with libpqdll.lib. So far you are just specifying a directory to look for the .lib in  - not actually telling it to do the link. I have no idea how to do that in Borland C++, though. In MSVC you just add the lib file to your project.
> 
> (Also, beware that PostgreSQL 7.2.1 is *very* old. I'd strongly suggest you look at something newer. For win32, you can go with either 7.4 on cygwin or 8.0 release candidate on native win32)
> 
> //Magnus
> 
> 
>>-----Original Message-----
>>From: Graf László [mailto:graf(dot)laszlo(at)axis(dot)hu] 
>>Sent: Monday, December 06, 2004 10:20 AM
>>To: pgsql-hackers-win32(at)postgresql(dot)org
>>Subject: [pgsql-hackers-win32] [Linker Error] Unresolved external
>>
>>Hi all,
>>
>>As a novice I installed PostgreSQL 7.2.1 on Win32 and works, 
>>Borland C++Builder Enterprise Suite 5.0 (build 12.34) what works too.
>>
>>I decided to combine these two programs and develop a simple 
>>GUI app to display datas queried from PostgreSQL. I did make 
>>the following changes in the project's settings:
>>
>>Project->Properties->Directories->Include path += C:\Program 
>>Project->Properties->Directories->Files\PostgreSQL\7\include Librariy 
>>Project->Properties->Directories->path += C:\Program 
>>Project->Properties->Directories->Files\PostgreSQL\7\lib
>>
>>(I aded these lines to the project paths).
>>
>>Within a brand new BCB project I typed in the simpliest code:
>>
>>
>>#include <libpq-fe.h>
>>char       *pghost, *pgport, *pgoptions, *pgtty;
>>char       *dbName;
>>int        nFields, i, j;
>>PGconn     *conn;
>>PGresult   *res;
>>
>>pghost = NULL;              /* host name of the backend server */
>>pgport = NULL;              /* port of the backend server */
>>pgoptions = NULL;           /* special options to start up the backend
>>                                  * server */
>>pgtty = NULL;               /* debugging tty for the backend server */
>>dbName = "template1";
>>
>>/* make a connection to the database */
>>conn = PQsetdb(pghost, pgport, pgoptions, pgtty, dbName);
>>
>>res = PQexec(conn, "BEGIN");
>>PQclear(res);
>>
>>res = PQexec(conn, "DECLARE mycursor CURSOR FOR SELECT * FROM 
>>pg_database"); PQclear(res); res = PQexec(conn, "FETCH ALL in 
>>mycursor"); nFields = PQnfields(res); for (i = 0; i < nFields; i++)
>>     printf("%-15s", PQfname(res, i));
>>printf("\n\n");
>>
>>/* next, print out the rows */
>>for (i = 0; i < PQntuples(res); i++)
>>{
>>     for (j = 0; j < nFields; j++)
>>         printf("%-15s", PQgetvalue(res, i, j));
>>     printf("\n");
>>}
>>PQclear(res);
>>
>>res = PQexec(conn, "CLOSE mycursor");
>>PQclear(res);
>>
>>/* commit the transaction */
>>res = PQexec(conn, "COMMIT");
>>PQclear(res);
>>
>>/* close the connection to the database and cleanup */ PQfinish(conn);
>>
>>When I run the app I got these errors:
>>
>>[Linker Error] Unresolved external '_PQconnectdb'
>>    referenced from C:\PROGRAM 
>>FILES\POSTGRESQL\7\CLIENT\BCB_01\MAIN.OBJ
>>[Linker Error] Unresolved external '_PQnfields'
>>    referenced from C:\PROGRAM 
>>FILES\POSTGRESQL\7\CLIENT\BCB_01\MAIN.OBJ
>>[Linker Error] Unresolved external '_PQexec'
>>    referenced from C:\PROGRAM 
>>FILES\POSTGRESQL\7\CLIENT\BCB_01\MAIN.OBJ
>>[Linker Error] Unresolved external '_PQclear'
>>    referenced from C:\PROGRAM 
>>FILES\POSTGRESQL\7\CLIENT\BCB_01\MAIN.OBJ
>>[Linker Error] Unresolved external '_PQfinish'
>>    referenced from C:\PROGRAM 
>>FILES\POSTGRESQL\7\CLIENT\BCB_01\MAIN.OBJ
>>
>>What is wrong? I supose that I miss something to configure.
>>
>>Laszlo Graf
>>
>>---------------------------(end of 
>>broadcast)---------------------------
>>TIP 5: Have you checked our extensive FAQ?
>>
>>               http://www.postgresql.org/docs/faqs/FAQ.html
>>
>>

-- 
Graf László - bitfaragó
http://grafl.port5.com/

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