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Command: XtSetArg | Section: 3 | Source: Digital UNIX | File: XtSetArg.3Xt.gz
XtSetArg(3Xt) XtSetArg(3Xt)
NAME
XtSetArg, XtMergeArgLists - set and merge ArgLists
SYNOPSIS
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;
ARGUMENTS
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.
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, XtNum-
ber(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 com-
bined ArgList structures and copies them into it. Note that it does not
check for duplicate entries. When it is no longer needed, free the re-
turned storage by using XtFree.
SEE ALSO
XtOffset(3Xt)
X Toolkit Intrinsics -- C Language Interface
Xlib -- C Language X Interface
XtSetArg(3Xt)