How does this connectString be written?

I want to connect Oracle whit occi.
Because I do not have files that "sqlnet.ora" and "tnsnames.ora", I must write the connectString properly.
login Service
User Id: root
Password : 123456
login Oracle DB
User Id : oracle
Password: 654321
SID: mydb
IP and Port
192.168.0.1:1521
My first connectString :
env->createConnection ("oracle", "654321", "root/[email protected]:1521/mydb");
But,I get the error:
ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
the file "listener.log" :
16-MAY-2008 17:19:19 * (CONNECT_DATA=(SERVICE_NAME=[email protected]) (INSTANCE_NAME=mydb)(SERVER=1521)(CID=(PROGRAM=connectoracle)(HOST=ubuntu)(USER=gxl))) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.0.148)(PORT=46185)) * establish * [email protected] * 12514
TNS-12514: TNS:listener could not resolve SERVICE_NAME given in connect descriptor

Hello,
I am getting following error -
terminate called after throwing an instance of 'oracle::occi::SQLException'
what(): ORA-01017: invalid username/password; logon denied
Aborted
This is code -
#include<occi.h>
using namespace oracle::occi;
int main()
Environment* env = Environment::createEnvironment();
Connection* conn = env->createConnection("oracle", "oracle","orcl");
env->terminateConnection(conn);
Environment::terminateEnvironment(env);
I have sqlnet.ora and tnsnames.ora in $ORACLE_HOME/network/admin
Also; I am able to connect to "orcl" as
sqlplus oracle as sysdba
Can someone help how to connect to database from OCCI application? What are prerequisite configurations (I read documentation but could not find any help from it :-( )

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