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Listing 2. sample.c, Version 2

/*
 * Sample XView Program, Version 2
 * - creates window frame
 * - adds control panel with two buttons
 * - adds text sub-window
 */
#include <xview/xview.h>
#include <xview/textsw.h>
#include <xview/panel.h>
/*
 * fixed literal string, inserted into text
 * sub-window */
char  *heyyou = "Hey, you!\n";
/*
 * handle for the text sub-window */
Textsw   textpane;
/*
 * Callback function for the "Insert String"
 * button */
void insert_string(Panel_item item, Event *event)
{
   textsw_insert(textpane, heyyou,
      strlen(heyyou));
}
/*
 * Callback function for the "Clear Window"
 * button */
void clear_window(Panel_item item, Event *event)
{
   textsw_reset(textpane, 0, 0);
}
/*
 * Mainline for sample program, version 2 */
void main(int argc, char *argv[])
{
   Frame frame;
   Panel panel;
   /*
    * let XView scan command-line arguments */
   xv_init(XV_INIT_ARGC_PTR_ARGV, &argc, &argv,
      NULL);
   /* create a top level frame */
   frame = (Frame)xv_create(XV_NULL, FRAME,
         FRAME_LABEL,   argv[0],
         XV_WIDTH,   300,
         XV_HEIGHT,  200,
         NULL);
   /* add a control panel to the frame */
   panel = (Panel)xv_create(frame, PANEL,
      XV_X,    0,
      XV_Y,    0,
      XV_WIDTH,   WIN_EXTEND_TO_EDGE,
      XV_HEIGHT,  30,
      WIN_BORDER, FALSE,
      NULL);
   /* add a button to the control panel */
   (void)xv_create(panel, PANEL_BUTTON,
      PANEL_LABEL_STRING,  "Insert String",
      PANEL_NOTIFY_PROC,   insert_string,
      NULL);
   /* add another button to the control panel */
   (void)xv_create(panel, PANEL_BUTTON,
      PANEL_LABEL_STRING,  "Clear Window",
      PANEL_NOTIFY_PROC,   clear_window,
      NULL);
   /* add the text sub-window to the frame */
   textpane = xv_create(frame, TEXTSW, NULL);
   /*
    * let XView handle all events for us */
   xv_main_loop(frame);
   exit(0);
   }
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