Athena Widget Set - C Language Interface - X Consortium ... - X.Org

Using WidgetsArg arglist[10];arglist[0].name = XtNwidth;arglist[0].value = (XtArgVal) 400;arglist[1].name = XtNheight;arglist[1].value = (XtArgVal) 300;Note that in this example, as in the previous example, XtNumber would return 10,not 2, and therefore would not be useful.The fourth approach is to use a mixture of the first and third approaches: you canstatically define the argument list but modify some entries at runtime. For example:static Arg arglist[] = {{XtNwidth, (XtArgVal) 400},{XtNheight, (XtArgVal) NULL},};arglist[1].value = (XtArgVal) 300;In this example, XtNumber can be used, as in the first approach, for easier codemaintenance.Example ProgramsThe best way to understand how to use any programming library is by trying somesimple examples. A collection of example programs that introduces each of the widgetsin that Athena widget set, as well as many important toolkit programming concepts,is available in the X11R5 contrib release as distributed by the X Consortium.It can be found in the directory contrib/examples/Xaw in the archive at http://www.x.org/releases/X11R5/contrib-1.tar.Z See the README file from that directoryfor a guide to the examples.20