Using tnsnames.ora

Question

Where can I ask a questio about OCI?
I want to make a connection using tnsname.ora except using a dblink and username and password whit oci. I used this code up to know :
OCIInitialize((ub4)mode, (dvoid *)0,
(dvoid*(*)(dvoid *ctxp, size_t size))0,
(dvoid*(*)(dvoid ctxp, dvoid memptr, size_t newsize))0,
(dvoid (*)(dvoid ctxp, dvoid memptr))0);
OCIEnvInit(&envhp, (ub4)OCI_DEFAULT, (size_t)0, (void**)0);
OCIHandleAlloc((dvoid*)envhp, (dvoid**)&errhp, (ub4)OCI_HTYPE_ERROR,
(size_t)0, (dvoid**)0),"");
OCIHandleAlloc((dvoid*)envhp, (dvoid**)&srvhp, (ub4)OCI_HTYPE_SERVER,
(size_t)0, (dvoid**)0);
OCIServerAttach(srvhp, errhp, (text*)dblink, (sb4)strlen(dblink), (ub4)OCI_DEFAULT);
OCIHandleAlloc((dvoid*)envhp, (dvoid**)&svchp, (ub4)OCI_HTYPE_SVCCTX,
(size_t)0, (dvoid**)0);
OCIAttrSet((dvoid*)svchp, (ub4)OCI_HTYPE_SVCCTX, (dvoid*)srvhp, (ub4)0,
(ub4)OCI_ATTR_SERVER, errhp);
OCIHandleAlloc((dvoid*)envhp, (dvoid**)&usrhp, (ub4)OCI_HTYPE_SESSION,
(size_t)0, (dvoid**)0);
OCIAttrSet((dvoid*)usrhp, (ub4)OCI_HTYPE_SESSION, (dvoid*)username,
(ub4)strlen(username), (ub4)OCI_ATTR_USERNAME, errhp);
OCIAttrSet((dvoid*)usrhp, (ub4)OCI_HTYPE_SESSION, (dvoid*)password,
(ub4)strlen(password), (ub4)OCI_ATTR_PASSWORD, errhp);
OCISessionBegin(svchp, errhp, usrhp, OCI_CRED_RDBMS,
OCI_DEFAULT);
But I want to change it in a way that I can use tnsnames.ora.

Answer 1

Do not pass the dblink parameter in your program, pass an empty string over there and if you are on a UNIX/LINUX set TWO_TASK to the tns alias, in your case if dblink was a valid tnx alias set TWO_TASK to dblink and run the program