DLL function needs byte size of a pointer as input argument.

So I am trying to use a DLL to control a traverse system (kind of similar to a CNC machine). I've contacted the manufacturer, but so far it seems like nobody there has tried conroling these types of machines with MATLAB before.

The problem I have is that most of the DLL functions I want to use take a pointer and an integer as input variables, but according to the documentation the integer is supposed to be a value that contains the byte size of the pointer. But if is use the MATLAB function whos to see what size a pointer has, the entry under Bytes remains blank.

here are some screenshots of the DLL functions and the documentation: http://imgur.com/a/MXhzk

Any help in relation to what could be meant with this value would be appreciated.