Error: ORA-01722 while connecting oracle using OCCI

Question

Please help,
I get exception 1722 ORA-01722 Invalid Number while selecting records from oracle database using simple select statement.
I have allready installed oracle 10.2.0.3.0 Patch 13 from oracle.com.
Environment: win2k3 (sp2-32 bit), Oracle 10.2.0.3.0, VC++ 2005 (VC8)
Dump of file vc8test.exe
File Type: EXECUTABLE IMAGE
Image has the following dependencies:
MSVCR80.dll
MSVCP80.dll
oraocci10.dll
KERNEL32.dll
Summary
1000 .data
1000 .rdata
1000 .rsrc
2000 .text

Answer 1

thanx for the reply, here is the source code:
I am unable to connect to oracle, i have tried every possible combination.
i had tested using vc++ 2005 and with vc++ 6.0
The below code is tested on visual c++ 2005 and from oracle 10.2.0 client.
#include <iostream>
#include <occi.h>
using namespace oracle::occi;
using namespace std;
class occidml
private:
     Environment *env;
     Connection *conn;
     Statement *stmt;
public:
     occidml(string user, string passwd, string db)
          env=Environment::createEnvironment(Environment::DEFAULT);
          conn=env->createConnection(user,passwd, db);
     ~occidml()
          env->terminateConnection(conn);
          Environment::terminateEnvironment(env);
     void displayAllRows()
               string sqlStmt="select * from tcm_ref_city";
               stmt=conn->createStatement(sqlStmt);
               ResultSet *rset=stmt->executeQuery();
               try{
                    while(rset->next()){
                         cout<< rset->getString(1)<<"\t"<<rset->getInt(2)<<endl;                         
                    }catch(SQLException ex){
                         cout<< "Exception\t"
                              <<ex.getErrorCode()<<"\t"
                              <<ex.getMessage()<<endl;
                         stmt->closeResultSet(rset);
                         conn->terminateStatement(stmt);
     int main(void)
          string usr="stltc";
          string pass="stltc";
          string db="stltc";
          int xx;
          cout<<"hello this is rakesh";
          occidml *demo=new occidml(usr,pass, db);
          demo->displayAllRows();
          cin>>xx;
          /*Environment *env1 ;
          Connection *conn;
          env1=Environment::createEnvironment(Environment::DEFAULT);
          Connection conn=env1->createConnection("STLIUC", "STLIUC","IAD");  /
          return 0;
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