sqlsrv with result_array() return nothing

[eluser]Unknown[/eluser]
Dear All,
I need help with CodeIgniter + sqlsrv. I try to use the driver from this one http://ellislab.com/forums/viewthread/205186/#1005167. It works but it return result_array() not see any result. Actually the driver sqlsrv in Codeigniter 2.1.0 is not work.

Thank you,
Raksa.Chao