Oracle Spatial datatype problems - HELP!!

Question

Can anyone help with this problem. I am using Pro*C/C++ to create a DLL which I am then
linking to another C based application. I am attempting to use Pro*C/C++ to read/write
Oracle Spatial Objects. I have no problem writing Pro*C/C++ code or accessing the
functions in the DLL. My problem is returning values from the DLL functions to my
application. So far the only values I seem able to return are character strings.
Below are two versions of the same function. One that returns a char string and a second
that returns nothing. I would like the second function to work and to return an integer
value for "g_type". Any ideas??? By the way "g_type" is the return value in question. I am
using Oracle Pro*C/C++ 8.1.5 and the V8 Oracle Call Interface for the datatype conversion.
Header files for the Object types have been generated by the Object Type Translator.
THIS FUNCTION WORKS AS EXPECTED. THE PARAMETER G_TYPE RETURNS THE ANTICIPATED STRING VALUE
int Read_Geometry
int gid,
char *g_type,
char *errMsg
char err_msg[128];
sword retcode;
int tester;
size_t buf_len, msg_len;
SDO_GEOMETRY geom = (SDO_GEOMETRY )0;
SDO_GEOMETRY_ind geom_ind = (SDO_GEOMETRY_ind )0;
exec sql at db_name allocate :geom:geom_ind;
exec sql at db_name select geometry into :geom:geom_ind from test81 where gid=:gid;
if (SQLCODE !=0)
exec sql whenever sqlerror continue;
buf_len = sizeof (err_msg);
sqlglm(err_msg, &buf_len, &msg_len);
strcpy(errMsg,err_msg);
return ERROR;
else
retcode = OCINumberToInt(err,&geom->sdo_gtype, sizeof(g_type), OCI_NUMBER_SIGNED,&tester);
if (retcode == OCI_ERROR)
sprintf(errMsg,"Convert failed");
return ERROR;
else
sprintf(g_type,"%d", tester);
sprintf(errMsg,"gType=%s",g_type);
return SUCCESS;
return SUCCESS;
THIS FUNCTION DOES NOT WORK. THE FUNCTION EXECUTES BUT THE PARAMETER G_TYPE RETURNS NOTHING?????????
int Read_Geometry
int gid,
int g_type,
char *errMsg
char err_msg[128];
sword retcode;
size_t buf_len, msg_len;
SDO_GEOMETRY geom = (SDO_GEOMETRY )0;
SDO_GEOMETRY_ind geom_ind = (SDO_GEOMETRY_ind )0;
exec sql at db_name allocate :geom:geom_ind;
exec sql at db_name select geometry into :geom:geom_ind from test81 where gid=:gid;
if (SQLCODE !=0)
exec sql whenever sqlerror continue;
buf_len = sizeof (err_msg);
sqlglm(err_msg, &buf_len, &msg_len);
strcpy(errMsg,err_msg);
return ERROR;
else
retcode = OCINumberToInt(err,&geom->sdo_gtype, sizeof(g_type), OCI_NUMBER_SIGNED,&g_type);
if (retcode == OCI_ERROR)
sprintf(errMsg,"Convert failed");
return ERROR;
else
return SUCCESS;
return SUCCESS;
Header file is as follows
struct SDO_GEOMETRY
OCINumber sdo_gtype;
OCINumber sdo_srid;
struct SDO_POINT_TYPE sdo_point;
SDO_ELEM_INFO_ARRAY * sdo_elem_info;
SDO_ORDINATE_ARRAY * sdo_ordinates;
typedef struct SDO_GEOMETRY SDO_GEOMETRY;
struct SDO_GEOMETRY_ind
OCIInd _atomic;
OCIInd sdo_gtype;
OCIInd sdo_srid;
struct SDO_POINT_TYPE_ind sdo_point;
OCIInd sdo_elem_info;
OCIInd sdo_ordinates;
typedef struct SDO_GEOMETRY_ind SDO_GEOMETRY_ind;

Answer 1

Hi,
From a quick look I can't see anything wrong. You might want to compare this with the example in $ORACLE_HOME/md/demo/examples.
Also, note that in 9i there will probably be an occi (C++ OCI) available, should this be useful to you.