HP SunSoft Pascal 4.0 Uživatelský manuál stáhnout pdf (Strana 250)

226 Pascal 4.0 User’s Guide

Example calls are:

The lists for Attr_avlist are created by functions that have the following

names:

attr_create_list_n()

attr_create_list_ns()

• The n indicates the number of arguments the routine accepts.

• The number of arguments can be 1-16.

• The routines ending in s return a pointer to a static attribute-value array,

which is reused with each call to the static list routines.

• The versions without the s return a dynamically allocated list, which should

be passed to xv_destroy() when you are ﬁnished with it.

Handles

When you create an XView object, xv_create() returns a handle for that

object. You pass this handle to the appropriate procedure for manipulating the

object.

Data Types

Each XView object has its own speciﬁc data type. The name of an object’s data

type always starts with a capital letter. For example, the data type for a

scrollbar is Scrollbar. The standard list of these types is in the header ﬁles.

Here,mymenu is an object of

type XV_object.

mymenu := xv_create (NULL, MENU, 0);

ncols := get_MENU_NCOLS (mymenu);

set_MENU_NITEMS (mymenu, items);

xv_find_l (mymenu, MENU,

attr_create_list_2s (MENU_DEFAULT,4));

xv_destroy (mymenu);

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HP SunSoft Pascal 4.0 Uživatelský manuál Strana 250