XtSetArg(3Xt) manual page
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XtSetArg, XtMergeArgLists - set and
merge ArgLists
- int XtSetArg(Arg arg, String name, XtArgVal value);
- ArgList XtMergeArgLists(ArgList args1, Cardinal num_args1, ArgList
- args2,
Cardinal num_args2);
- arg
- Specifies the name-value pair to set.
- args1
- Specifies
the first ArgList.
- args2
- Specifies the second ArgList.
- num_args1
- Specifies
the number of arguments in the first argument list.
- num_args2
- Specifies the
number of arguments in the second argument list.
- name
- Specifies the name
of the resource.
- value
- Specifies the value of the resource if it will fit
in an XtArgVal or the address.
The XtSetArg function is usually
used in a highly stylized manner to minimize the probability of making
a mistake; for example:
0>=40 .vs 0u
0<=39 .vs 0p
Arg args[20];
int n;
n = 0;
XtSetArg(args[n], XtNheight, 100); n++;
XtSetArg(args[n], XtNwidth, 200); n++;
XtSetValues(widget, args, n);
Alternatively, an application can statically declare the argument list
and use XtNumber:
0>=40 .vs 0u
0<=39 .vs 0p
static Args args[] = {
{XtNheight, (XtArgVal) 100},
{XtNwidth, (XtArgVal) 200},
};
XtSetValues(Widget, args, XtNumber(args));
Note that you should not use auto-increment or auto-decrement within the
first argument to XtSetArg. XtSetArg can be implemented as a macro that
dereferences the first argument twice.
The XtMergeArgLists function allocates
enough storage to hold the combined ArgList structures and copies them
into it. Note that it does not check for duplicate entries. When it is no
longer needed, free the returned storage by using XtFree.
XtOffset(3Xt)
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface
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