1.5. Your second Motif Program   

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

    #include <stdio.h>

    #include <X11/Intrinsic.h>

    #include <Xm/Xm.h>

    #include <Xm/PushB.h>


    void main();

    void activate_cb(); /* Callback for the PushButton */


    static void Syntax(app_con, call)

    XtAppContext app_con;

    char *call;

    {

        XtDestroyApplicationContext(app_con);

        fprintf( stderr, "Usage: %s\n", call);

        exit(1);

    }


    void main (argc,argv)

    unsigned int argc;

    char **argv;

    {

    Widget      toplevel; /*  Shell widget      */

    Widget      button; /*  PushButton widget   */

    XtAppContext app_context;

    XmString btn_text;  /* button label pointer for compound string */


        toplevel = XtVaAppInitialize( &app_context,       /* Application context */

                                "XMcommand",         /* Application class */

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

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

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

                                NULL);              /* terminate varargs list */


        if (argc != 1)

                Syntax(app_context, argv[0]);


        /*  create compound string for the button text  */

        btn_text = XmStringCreateLtoR("Click on me please!", XmSTRING_DEFAULT_CHARSET);


        /*  create button  */

        button = XtVaCreateManagedWidget ("button", xmPushButtonWidgetClass, toplevel,

                                XmNlabelType, XmSTRING,

                                XmNlabelString, btn_text,

                                XmNwidth, 250,

                                XmNheight, 150,

                                NULL);

        XtAddCallback (button, XmNactivateCallback, activate_cb, "Hi There!");


        XtRealizeWidget (toplevel);

        XtAppMainLoop(app_context);

    }


    void activate_cb (widget_cb, client_data, call_data)

    Widget      widget_cb;              /*  widget id           */

    XtPointer   client_data;    /*  data from application   */

    XtPointer   call_data;      /*  data from widget class  */

    {

    char *string = (char *) client_data;

    XmString xm_label_string;

    char *label_string;


        XtVaGetValues(widget_cb,

                XmNlabelString, &xm_label_string,

                NULL);


        XmStringGetLtoR(xm_label_string,

                        XmSTRING_DEFAULT_CHARSET,

                        &label_string);


        fprintf(stdout, "Button

                        label_string,string);


        label_string = XmStringCreateLtoR("New Label", XmSTRING_DEFAULT_CHARSET);

        XtVaSetValues(widget_cb,

                        XmNlabelString,label_string,

                        NULL);

    }

    #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=xmcommand
This will produce the executable called xmcommand.

It is possible to execute a (different) xmcommand 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