VistaIOOffset, VistaIOOffsetOf - determine the byte offset of a structure field

field_name
                 Specifies the name of a structure field for which to calculate the byte offset.

       pointer_type
                 Specifies a type that is declared as a pointer to a structure.

       struct_type
                 Specifies a type that is declared as a structure.

       The  VistaIOOffset  and  VistaIOOffsetOf macros return the byte offset of the field_name field within its
       structure.

       VistaIOOffset, VistaIOOffsetOf - determine the byte offset of a structure field

       These are equivalent to the X Toolkit  macros  XtOffset(3Xt)  and  XtOffsetOf(3Xt).  ANSI  C  defines  an
       offsetof macro, which is to be preferred over any of these.

VistaIO Version 1.2.14                           19 January 1993                                VistaIOOffset(3)

#include<vistaio.h>size_tVistaIOOffset(pointer_type,field_name)Typepointer_type;Fieldfield_name;size_tVistaIOOffsetOf(struct_type,field_name)Typestruct_type;Fieldfield_name;