Calling a method in a library that has an "HandlePtr" argument

Hello I am trying to get a Z stage working with matlab. The Vendor (Dover Motion) have shared their dll. This is the first time I've dived into this part of matlab, so please excuse my lack of knowledge (I'm not really a c or c++ programmer either)

So I've read I need to use loadlibrary (and I've used an alias)

            loadlibrary(lib_name,h_name, 'alias','lib')     % lib is alias name for C-Motion library
            libisloaded('lib')                              % Check to see its loaded OK
            libfunctions('lib')                             % List methods in the command window
            libfunctionsview('lib')                         % List methods in fancy graphic!

This works fine, and I get a nice graphic showing the methods/functions.

One of those functions I want to use is: PMDSetupAxisInterface_Serial

This is where I am stuck - with the argument (tagPMDAxisHandlePtr) - I don't really know what i'm doing but have tried.

I've read that to call a method inside a dll, to use calllib, so I have tried:

handle = libstruct('tagPMDAxisHandle');
%handle = libpointer('tagPMDAxisHandle');
calllib('lib','PMDSetupAxisInterface_Serial',handle,0,1)

But it cause matlab to crash.

Here's the output of

handle = libstruct('tagPMDAxisHandle');
handle =
	lib.tagPMDAxisHandle

and

handle = libpointer('tagPMDAxisHandle');
handle =
libpointer

Thnaks for any help

Jason