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XtSetArg, XtMergeArgLists - set and merge ArgLists
XtSetArg(arg, name, value)
Arg arg;
String name;
XtArgVal value;
ArgList
XtMergeArgLists(args1, num_args1, args2, num_args2)
ArgList args1;
Cardinal num_args1;
ArgList args2;
Cardinal num_args2;
Specifies the name-value pair to set.
Specifies the first
ArgList.
Specifies the second
ArgList.
Specifies the number of arguments in the first argument list.
Specifies the number of arguments in the second argument list.
Specifies the name of the resource.
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:
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.
XtOffset(3Xt)
X Toolkit Intrinsics -- C Language Interface
Xlib -- C Language X Interface