Question

i have a simple program which is compiled with gtk2.0 in ubuntu.In ubuntu11.04 i installed gtk3.then i compile the same code,i got an error in the following line

/* Add a timer callback to update the value of the progress bar */
timer = gtk_timeout_add (100, progress_timeout, pdata);

i just comment the line and recompile it.then i got output file.but it is not properly working without the commented line.

in gtk2.0 i compiled by the following command

gcc progressbar.c `pkg-config --cflags --libs gtk+-2.0`

and in gtk3

gcc progressbar.c `pkg-config --cflags --libs gtk+-3.0`

I have a doubt that,is there any deprecation in that method in gtk3.please give me a link to an easy documentation with examples.what are the main difference between 2 and 3.
The full source code is as shown below

#include <gtk/gtk.h>

typedef struct _ProgressData {
GtkWidget *pbar; 
} ProgressData;

gint progress_timeout( gpointer data )
{
  ProgressData *pdata = (ProgressData *)data;
  gdouble new_val;
  new_val = gtk_progress_bar_get_fraction (GTK_PROGRESS_BAR (pdata->pbar)) + 0.01;

  if (new_val > 1.0)
new_val = 0.0;

  gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (pdata->pbar), new_val);

  return TRUE;
} 


int main( int   argc,
      char *argv[])
{
ProgressData *pdata;
GtkWidget *align;
GtkWidget *window;

int timer;  

GtkWidget *vbox;

gtk_init (&argc, &argv);

/* Allocate memory for the data that is passed to the callbacks */
pdata = g_malloc (sizeof (ProgressData));

window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_resizable (GTK_WINDOW (window), TRUE);

    g_signal_connect ( window, "destroy", gtk_main_quit, NULL ) ;

gtk_window_set_title (GTK_WINDOW (window), "GtkProgressBar");
gtk_container_set_border_width (GTK_CONTAINER (window), 0);

vbox = gtk_vbox_new (FALSE, 5);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 10);
gtk_container_add (GTK_CONTAINER (window), vbox);
gtk_widget_show (vbox);

/* Create a centering alignment object */
align = gtk_alignment_new (0.5, 0.5, 0, 0);
gtk_box_pack_start (GTK_BOX (vbox), align, FALSE, FALSE, 5);
gtk_widget_show (align);

/* Create the GtkProgressBar */
pdata->pbar = gtk_progress_bar_new ();

gtk_container_add (GTK_CONTAINER (align), pdata->pbar);
gtk_widget_show (pdata->pbar);

/* Add a timer callback to update the value of the progress bar */
timer = gtk_timeout_add (100, progress_timeout, pdata);


gtk_widget_show (window);

gtk_main ();

return 0;
}

Answer 1

You need to change the gtk_timeout_add call to g_timeout_add.

gtk_timeout_add ()

guint               gtk_timeout_add                     (guint32 interval,
                                                         GtkFunction function,
                                                         gpointer data);

Warning

gtk_timeout_add has been deprecated since version 2.4 and should not be used in 
newly-written code. Use g_timeout_add() instead.

Google “gtk_timeout_add g_timeout_add” will get you examples, e.g. this one, http://gna.org/patch/?2563.