ADS API for Unicode data

I have a Japanese Unicode data file and I imported the text file into my SQL database table with Japanese collation.

My SQL script select the data into NVARCHAR data type. I passed these data type to unsigned short * in my C++ code. I am using ADS API.

In my C++ code, I extract the data with
memcpy(utfStr, srv_paramdata(srvproc, 2), srv_paramlen(srvproc, 2));

The data I'm getting doesn't match the original input.

I tried using WideCharToMultiByte() but with no success.

ANyone does this before??

Thanks for your help!