How to set connectString in the connect?

if i am not install Oracle client,can i use occi?
if i will access a remote db,how do it?

Try the documentation :
Oracle C++ Call Interface Programmer's Guide, chapter 2.
See the section "Connecting to a Database"

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How to set connectString?

Please help me!
I have been doing som tests to connect to database in OCCI Environment,but failed.
Test 1:
I connect to database use connectString with "MYORA", but show folllwing wrong message:
---------Wrong Message-----------
the connectString is:
MYORA
the error is:12705
the error is:ORA-12705: invalid or unknown NLS parameter value specified
---------Wrong Message-----------
Test 2:
Then I use Following string, The errors still occur:
---------Wrong Message-----------
the connectString is:
(DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 10.
181.21.1)(PORT = 1521)) ) (CONNECT_DATA = (SID = yxora) (SERVER
= DEDICATED) ) )
the error is:12705
the error is:ORA-12705: invalid or unknown NLS parameter value specified
---------Wrong Message-----------
Test 3:
I modify the connectString is:
//10.181.21.1:1521/YXORA
Then connect, but the error is still!
---------Wrong Message-----------
the connectString is:
//10.181.21.1:1521/yxora
the error is:6401
the error is:ORA-06401: NETCMN: invalid driver designator
---------Wrong Message-----------
Test 4:
I connect to database useing MYORA in sqlplus, It is successfull!
How to set connectString in OCCI Environment?
Note:
*1.The "MYORA" is seted in file "tnsnames.ora" is:
MYORA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 10.181.21.1)(PORT = 1521))
(CONNECT_DATA =
(SID = yxora)
(SERVER = DEDICATED)
*2.I work under Winxp+vc6

1. My test code:
#include "stdafx.h"
#include <occi.h>
#include <iostream.h>
using namespace oracle::occi;
using namespace std;
const string userName = "test";
const string ppassword= "oratest";
//const string connectString="//10.181.21.53:1521/TESTORA";
const string connectString="(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=10.181.21.1)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=YXORA)))";
int main(int argc, char* argv[])
 printf("\n1.Create Environment!\n");
 Environment *env = Environment::createEnvironment();
 try{
 printf("\n2.Create Connection!\n");
 cout<<"the connectString is:\n"<<connectString.c_str()<<endl;
 Connection *conn = env->createConnection(userName,ppassword,connectString);
 printf("\n3.Create Statement!\n");
 Statement *stmt = conn->createStatement("Select ZHH,HM from ydd where zhh<10");
 printf("\n4.Run SQL!\n");
 ResultSet *rs=stmt->executeQuery();
 printf("\n5.SQL Return result!\n");
 while(rs->next()){
 printf("ZHH=%d,\tHM=%s",rs->getInt(1),rs->getString(2));
 stmt->closeResultSet(rs);
 conn->terminateStatement(stmt);
 env->terminateConnection(conn);
 }catch(SQLException ex){
 string s = ex.getMessage();
 cout<<"the error is:" << ex.getErrorCode()<<endl;
 cout<<"the error is:" << s.c_str()<<endl;
 Environment::terminateEnvironment(env);
 return 0;
the output is:
1.Create Environment!
2.Create Connection!
the connectString is:
(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=10.181.21.1)(PORT=1521))(CONNECT_DATA=
(SERVICE_NAME=YXORA)))
the error is:12705
the error is:ORA-12705: invalid or unknown NLS parameter value specified
Press any key to continue
2. I test under Server9i/Client9i ,
3. How to set Environment?
4. I think this error is caused by Character set. My server's Character set is ZHS16GBK. I how to identified Charcter set in my OCCI program?

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How to set connectString in the connect?

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