Hello.
I'm trying to create a C-procedure returning text variable - again :).
Postgres 8.3.3 (standard binaries - so built by means of MSVC), WinXP SP2.
I also use MSVC 2005 for compilation my library.
Configuration type - Dynamic Library (.dll)
Additional include directories -
D:\pgsql83\include;D:\pgsql83\include\server;D:\pgsql83\include\server\port\win32
Additional library directories - D:\pgsql83\lib
Additional dependencies - postgres.lib
Compile as C Code (/TC)
(By the way, I can't compile it as C++ Code (/TP)
In this case I get a lot of errors. F.e.
d:\pgsql83\include\server\nodes\primnodes.h(1078) : error C2238: unexpected
token(s) preceding ';'
1d:\pgsql83\include\server\nodes\parsenodes.h(167) : error C2059: syntax error
: 'typeid' )
So, here is the code:
--
include postgres.h
#include fmgr.h
#include executor/executor.h
#include utils/timestamp.h
#include utils/builtins.h
#include utils/formatting.h
#ifdef PG_MODULE_MAGIC
PG_MODULE_MAGIC;
#endif
#define GET_TEXT(cstrp) DatumGetTextP(DirectFunctionCall1(textin,
CStringGetDatum(cstrp)))
PG_FUNCTION_INFO_V1(getTimeFromApplication);
Datum
getTimeFromApplication(PG_FUNCTION_ARGS)
{
PG_RETURN_TEXT_P(GET_TEXT(success));
}
I can compile it and get the library, but there are some warnings:
1d:\pgsql83\getstring\c_getstring.c(10) : warning C4273: 'Pg_magic_func' :
inconsistent dll linkage
1d:\pgsql83\getstring\c_getstring.c(10) : see previous definition of
'Pg_magic_func'
1d:\pgsql83\getstring\c_getstring.c(24) : warning C4273:
'pg_finfo_getTimeFromApplication' : inconsistent dll linkage
1d:\pgsql83\getstring\c_getstring.c(24) : see previous definition of
'pg_finfo_getTimeFromApplication'
1d:\pgsql83\getstring\c_getstring.c(75) : warning C4311: 'type cast' : pointer
truncation from 'char [8]' to 'Datum'
1d:\pgsql83\getstring\c_getstring.c(75) : warning C4312: 'type cast' :
conversion from 'Datum' to 'Pointer' of greater size
1d:\pgsql83\getstring\c_getstring.c(75) : warning C4311: 'type cast' : pointer
truncation from 'varlena *' to 'Datum'
---
Then I put the library into 'lib' directory and create the stored procedure:
CREATE OR REPLACE FUNCTION service.get_app_time () RETURNS text AS
'$libdir/getstring', 'pg_finfo_getTimeFromApplication'
LANGUAGE C STRICT;
Then I try to run it:
select * from service.get_app_time ();
And get an error:
ERROR: invalid memory alloc request size 4294967293
What did I wrong?
Thanks in advance, Marina.
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