On 28 May 2010 01:28, Schwab,Wilhelm K bschwab@anest.ufl.edu wrote:

Hello all,

I am faced with some win32 software that uses a structure like

struct gizmo {  double x; y; z;  double q[4]; }

Would it be legal to treat that as

struct gizmo {  double x; y; z;  double q0; q1; q2; q3; }

yes.

But there could be other issues, like fields alignment (which is not for gizmo , since its fields are 8-bytes wide).

and then let Pharo define the fields?  This is running on 32 bit winxp.  A colleague is doing 3D magic with the resulting numbers, but Weird things appear to be happening.  I am looking for ways that I might be causing them.  It is also possible that the gizmo to which we are interfacing is just plain broken.

At the last resort, just compile a simple C program which prints an offsets to these fields, like:

gizmo z;

printf ("%d\n" , &(z.q[3]) - &z );

Bill