1.2. Your first Motif Program   

The best way to understand how to use any programming library is by trying some simple examples. A collection of example programs that introduces some of the widgets in the Motif widget set can be found in the directory

      /usr/units/Xm

You can now create your first Motif program (see later to retrieve it):

    /*

     * xmhello.c - simple program to put up a banner on the display

     */


    /*

     * Header files required for all Toolkit programs

     */

    #include <X11/Intrinsic.h>     /* Intrinsics definitions */

    #include <Xm/Xm.h>    /* Standard Motif definitions */


    /*

     * Public header file for widgets actually used in this file.

     */

    #include <Xm/Label.h>     /* Motif Label Widget */


    main(argc, argv)

    int argc;

    char **argv;

    {

    XtAppContext app_context;

    Widget topLevel, hello;


        topLevel = XtVaAppInitialize(

                        &app_context,       /* Application context */

                        "XMhello",         /* Application class */

                        NULL, 0,            /* command line option list */

                        &argc, argv,        /* command line args */

                        NULL,               /* for missing app-defaults file */

                        NULL);              /* terminate varargs list */


        hello = XtVaCreateManagedWidget(

                        "hello",            /* arbitrary widget name */

                        xmLabelWidgetClass,    /* widget class from Label.h */

                        topLevel,            /* parent widget */

                        NULL);              /* terminate varargs list */


        /*

        *  Create windows for widgets and map them.

        */

        XtRealizeWidget(topLevel);


        /*

        *  Loop for events.

        */

        XtAppMainLoop(app_context);

    }

    #include <Motif.tmpl>

         LOCAL_LIBRARIES = $(XMLIB) $(SYSLIBS)

                    FILE = xmhello

                    SRCS = $(FILE).c

                    OBJS = $(FILE).o

                PROGRAM = $(FILE)


    ComplexProgramTarget($(FILE))

After retrieving and saving the code plus Imakefile, you should be able to type:
xmkmf -a ; make FILE=xmhello
This will produce the executable called xmhello.

It is possible to execute a (different) xmhello program and display it on your screen. To run it, your system must be running X and the server control is set to xhost . Also it will not work if you are using a proxy server or you are running your browser on a machine different from the one you are displaying it on. Many example programs are available