NAME
XtSetArg, XtMergeArgLists - set and merge ArgLists
SYNTAX
int
XtSetArg(Arg arg, String name, XtArgVal value);
ArgList
XtMergeArgLists(ArgList args1, Cardinal num_args1, ArgList
args2, Cardinal num_args2);
ARGUMENTS
- 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.
DESCRIPTION
The
XtSetArg function is usually used in a highly stylized manner to
minimize the probability of making a mistake; for example:
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:
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.
SEE ALSO
XtOffset(3)
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface