HP SunSoft Pascal 4.0 - Manual (Page 249)

The XView Toolkit 225
10
Instead of these routines, the Pascal interface to XView defines a separate
routine to get and set each attribute.
•
set —The routine to set an attribute is called set_ attrname. Each set
routine is a procedure, and takes as its first argument the object for which
the attribute is being set. The second argument is the value of the attribute.
•
get —The routine to get the value of an attribute is called get_ attrname.
Each get routine is a function, and takes an XView object as the first
argument. It returns the value of the attribute requested.
For example:
These routines are defined in the header file, attrgetset_p.h .
Attribute Lists
Some of the XView C routines can optionally take extra arguments that are lists
of attributes and values. The extra arguments vary in number and type. You
must pass a
0 to the last argument of these routines.
Since Pascal does not support variable length argument lists, the Pascal
definition has a single argument.
Instead, special versions of these routines are provided which take as a last
argument an argument of type
Attr_avlist . This type is a pointer to an
array of attributes and values. The special routines are:
xv_init_l() ,
xv_create_l() ,
xv_find_l() ,
selection_ask_l() ,
selection_init_request_l() .
set_WIN_SHOW ( frame, true );
width := get_CANVAS_WIDTH ( canvas );