Pardiso pointer (pt) type

Hi,

 I am using pardiso solver in c++ under visual studio 2012 (x64). What should be the proper type of pt (int or long int). I cam currently using it as void *. Also I am linking with interface layer  lp64. Should I be using ilp64?

When I used it as long int, my run would crash in Release mode, but not in debug mode. However it seems to run fine if I use void *

Thanks

Dinesh