problem with binding the CLOB data

When I try to use OCI bind for the CLOB data type, my code is dumping core with some signal 10 bus error - Invalid address alignment, then I have tried using SLT_CHR for the same. by using this I am no more getting a core dump.. but the code is giving me a return status of -1 at OCIStmtExecute() and then its failing to update in the database... with an error as number/type of arguments mismatch with the PL SQL call.

Do I need to use something like OCIclobLocator for binding CLOB data type .. have seen about this in the web.. but failing to get a sample snippet to implement the same.

Seek you help in this regard... anyone who has previously implemented or have any idea please respond...
If you find any sample links which deal with PLSQL procedure call from c Program then please let me know

Please let me know if my question is not clear..

thanks
Lavanya