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Hello World X Windows System

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--- HELLO.C START ---

/*

 HelloX.C
 ========
 (c) Copyright Paul Griffiths 1999
 Email: paulgriffiths@cwcom.net

 "Hello, World!", X Window System style.

*/


#include
#include
#include
#include

#include
#include
#include


/* Global variables */

Display *   display;
int      screen_num;
static char * appname;


/* main() function */

int main( int argc, char * argv[] ) {

  /* Window variables */

  Window    win;
  int     x, y;
  unsigned int width, height;
  unsigned int border_width;
  char *    window_name = "Hello, X Window System!";
  char *    icon_name  = "HelloX";


  /* Display variables */

  char *    display_name = NULL;
  unsigned int display_width, display_height;
  

  /* Miscellaneous X variables */

  XSizeHints * size_hints;
  XWMHints  * wm_hints;
  XClassHint * class_hints;
  XTextProperty windowName, iconName;
  XEvent    report;
  XFontStruct * font_info;
  XGCValues   values;
  GC      gc;
  
  appname = argv[0];


  /* Allocate memory for our structures */

  if ( !( size_hints = XAllocSizeHints() ) ||
!( wm_hints  = XAllocWMHints()  ) ||
!( class_hints = XAllocClassHint() )  ) {
fprintf(stderr, "%s: couldn't allocate memory.\n", appname);
exit(EXIT_FAILURE);
  }


  /* Connect to X server */

  if ( (display = XOpenDisplay(display_name)) == NULL ) {
fprintf(stderr, "%s: couldn't connect to X server %s\n",
appname, display_name);
exit(EXIT_FAILURE);
  }


  /* Get screen size from display structure macro */

  screen_num   = DefaultScreen(display);
  display_width = DisplayWidth(display, screen_num);
  display_height = DisplayHeight(display, screen_num);


  /* Set initial window size and position, and create it */

  x = y = 0;
  width = display_width / 3;
  height = display_width / 3;

  win = XCreateSimpleWindow(display, RootWindow(display, screen_num),
   x, y, width, height, border_width,
   BlackPixel(display, screen_num),
   WhitePixel(display, screen_num));


  /* Set hints for window manager before mapping window */

  if ( XStringListToTextProperty(&window_name, 1, &windowName) == 0 ) {
fprintf(stderr, "%s: structure allocation for windowName failed.\n",
appname);
exit(EXIT_FAILURE);
  }

  if ( XStringListToTextProperty(&icon_name, 1, &iconName) == 0 ) {
fprintf(stderr, "%s: structure allocation for iconName failed.\n",
appname);
exit(EXIT_FAILURE);
  }

  size_hints->flags    = PPosition | PSize | PMinSize;
  size_hints->min_width  = 200;
  size_hints->min_height = 100;

  wm_hints->flags     = StateHint | InputHint;
  wm_hints->initial_state = NormalState;
  wm_hints->input     = True;

  class_hints->res_name  = appname;
  class_hints->res_class = "hellox";

  XSetWMProperties(display, win, &windowName, &iconName, argv, argc,
   size_hints, wm_hints, class_hints);


  /* Choose which events we want to handle */

  XSelectInput(display, win, ExposureMask | KeyPressMask |
ButtonPressMask | StructureNotifyMask);


  /* Load a font called "9x15" */

  if ( (font_info = XLoadQueryFont(display, "9x15")) == NULL ) {
fprintf(stderr, "%s: cannot open 9x15 font.\n", appname);
exit(EXIT_FAILURE);
  }


  /* Create graphics context */

  gc = XCreateGC(display, win, 0, &values);

  XSetFont(display, gc, font_info->fid);
  XSetForeground(display, gc, BlackPixel(display, screen_num));


  /* Display Window */

  XMapWindow(display, win);

  
  /* Enter event loop */

  while ( 1 ) {
static char * message = "Hello, X Window System!";
static int  length;
static int  font_height;
static int  msg_x, msg_y;

XNextEvent(display, &report);

switch ( report.type ) {

case Expose:

  if ( report.xexpose.count != 0 )
break;

  /* Output message centrally in window */

  length = XTextWidth(font_info, message, strlen(message));
  msg_x = (width - length) / 2;

  font_height = font_info->ascent + font_info->descent;
  msg_y = (height + font_height) / 2;

  XDrawString(display, win, gc, msg_x, msg_y,
message, strlen(message));

  break;


case ConfigureNotify:

  /* Store new window width & height */

  width = report.xconfigure.width;
  height = report.xconfigure.height;

  break;


case ButtonPress:      /* Fall through */
case KeyPress:

  /* Clean up and exit */

  XUnloadFont(display, font_info->fid);
  XFreeGC(display, gc);
  XCloseDisplay(display);
  exit(EXIT_SUCCESS);

}
  }

  return EXIT_SUCCESS;  /* We shouldn't get here */
}

--- HELLO.C END ---

--- Makefile START ---

HelloX: HelloX.o
gcc -o HelloX HelloX.o -Wall -L/usr/X11R6/lib -lX11

HelloX.o: HelloX.c
gcc -o HelloX.o HelloX.c -c -ansi -pedantic -Wall

--- Makefile END ---


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Submitted By : Ravi Patel  (Member Since : 4/3/2005 12:24:13 PM)

Job Description : Music
View all (1) submissions by this author  (Birth Date : 7/20/1980 )


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