Is it possible that the XPRESS c-libraries can be called directly from Python using ctypes?

In xprm_rt.h, the XPRMmodel type is defined as follows:

typedef struct Model* XPRMmodel;

This means, that it is a pointer to a struct. In ctypes, use the void pointer c_void_p to represent that pointer. By default, ctypes assumes that the result type of a function is a c_int. You have to change it to c_void_p. Moreover, you have to set the function argument types to the c type that represents "char *": c_char_p.

   lib.XPRMloadmod.restype = c_void_p

   lib.XPRMloadmod.argtypes = [c_char_p, c_char_p]

Now you can call the function as follows, assuming that bname and intname are normal Python strings:

mod = lib.XPRMloadmod(bname.encode(), intname.encode())

I am preparing an example and will attach it to this thread, when it is finished.