Problem calling C function in PostgreSQL

2009/10/22 A.Bhattacharya <A.Bhattacharya@sungard.com>:

Hi,

I am new to PostgreSQL  and could  anyone please suggest me any windows based C compiler which will successfully create a dll on windows and which can be callable by PostgreSQL.

I am facing a problem with the below code compiled and created dll in MSVC 2005.

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Here is my code:

#define _USE_32BIT_TIME_T
#include "postgres.h"
#include "fmgr.h"

//#ifdef PG_MODULE_MAGIC
PG_MODULE_MAGIC;
//#endif

PG_FUNCTION_INFO_V1(add_one);
Datum add_one(PG_FUNCTION_ARGS)
{
   int32   arg = PG_GETARG_INT32(0);

   PG_RETURN_INT32(arg + 1);
}

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But when I am calling this function from POstgreSQL the below error is thrown.
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CREATE OR REPLACE FUNCTION add_test(iparam int) RETURNS int AS '$libdir/add', 'add_one' LANGUAGE C;

ERROR:  could not find function "add_one" in file "C:/Program Files/PostgreSQL/8.3/lib/add.dll"
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It would be kind if any help!

Try adding __declspec(dllexport) to the function, that might be what
you're missing unless you have a DEF file exporting it. Also, make
sure your function is C and not C++.

--
Magnus Hagander
Me: http://www.hagander.net/
Work: http://www.redpill-linpro.com/