Is there a way to check if process is 64 bit or 32 bit?

I am trying to find process type (32 bit/ 64bit) from process pid?

I get the process information and process list from using GetBSDProcessList method described here.

how can we get the process type information? Any Ideas?

I can use defined(i386) or defined(x86_64) but only if we are in process. I am out of the process.