Server crash during simple c-language function

Hi,

I am trying to create a simple c-language function for "PostgreSQL
8.4.4, compiled by Visual C++ build 1400, 32-bit" running on Windows 7
(32-bit). It works, until I use a SPI.

1) CRASH: I successfully execute a simple query using SPI_exec(), but
when getting the result, it crashes:
SPI_getvalue(SPI_tuptable->vals[0], SPI_tuptable->tupdesc, 1);
I tried to look wherever I could, but I have no idea what could go wrong.

2) NOT COMPILE: When I what to read value of global SPI_result, I
cannot compile - unresolved external symbol "_SPI_result". I am
currently linking with 'postgres.lib" and I haven't found anything
else what to link with additionally. Compiling using Visual Studio
2008, C/C++ project set to compile for "C".

Can anybody point out, what I am doing wrong?
The complete code and project are below.

Thanks, Tomas

======================== CODE =============
#define BUILDING_DLL 1

#include "postgres.h"
#include "fmgr.h"
#include "executor/spi.h"

#ifdef PG_MODULE_MAGIC
PG_MODULE_MAGIC;
#endif

PG_FUNCTION_INFO_V1(crash_repro);


__declspec (dllexport)
Datum crash_repro(PG_FUNCTION_ARGS)
{
    int exec_result;

    SPI_connect();

    exec_result = SPI_exec("select 'test'", 0);

    elog(NOTICE, "exect_result_state = %i", exec_result);
    elog(NOTICE, "SPI_processed = %u", SPI_processed);

    if ((SPI_processed > 0) && (SPI_tuptable != NULL))
    {
        elog(NOTICE, "SPI_tuptable is not NULL");
        SPI_getvalue(SPI_tuptable->vals[0], SPI_tuptable->tupdesc, 1);
    }

    SPI_finish();

    PG_RETURN_NULL();
}

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