Martijn van Oosterhout ha scritto:
On Tue, Sep 02, 2008 at 10:53:03AM +0200, Edoardo Panfili wrote:
But i have a little question about parameters of enum_out.
Datum enum_out(PG_FUNCTION_ARGS);
this is a part of my function
-----------------------------------------------------------
Datum esterna_nome2(PG_FUNCTION_ARGS){
int label;
label = enum_out(fcinfo);
sprintf(debug,"false enum_out: \"%s\" ",unrolled);
elog(LOG, debug);
-----------------------------------------------------------
but it works only because my enum parameter is the first (and using
fcinfo is a little obscure).
Look in the fmgr.h header for functions like DirectFunctionCall1 and
various other ways of calling functions.
Now it works! thank you to Martin and Tom.
this is a code fragment:
--------------------------------------------------------------
#include "utils/builtins.h"
PG_FUNCTION_INFO_V1(esterna_nome);
Datum esterna_nome(PG_FUNCTION_ARGS){
Datum datumIbrido = PG_GETARG_DATUM(0);
Datum labelDatum;
char *label;
labelDatum = DirectFunctionCall1(enum_out,datumIbrido);
label = (char *) DatumGetPointer(labelDatum);
if(strcmp(label,("label_constant"))==0){
...
}
...
}
--------------------------------------------------------------
I don't know why but I need <<#include "utils/builtins.h">>
The line "label = (char *) DatumGetPointer(labelDatum);" is essential to
use the information in strcmp() if I use directly labelDatum it does not
works (but it works inside a sprintf(buffer,"%s",labelDatum)).
thank you again
Edoardo
