LinuxQuestions.org - GTK+ and c question

i am currently teaching myself C and gtk at the same time by writing a simple/silly program for converting human years into cat or dog years. my question is how do i get the address/pointer/hopeyouknowehatimean of a gtkwidget radio button in a function so i can check to see if it is active? here is the code:

Code:

#include <stdio.h>

#include <stdlib.h> 

#include <gtk/gtk.h>



#define DOGYEARS 7

#define CATYEARS 4



static void destroy( GtkWidget *widget,

                    gpointer data )

{

  gtk_main_quit ();

}



static void to_dog( GtkWidget *widget,

                    GtkWidget *text )

{

  const gchar *entry_text;

  gchar *dog_years;

  float years;



  entry_text = gtk_entry_get_text (GTK_ENTRY (text));

  printf ("Text: %s\n", entry_text);

  years = (atof (entry_text)) * DOGYEARS;

  sprintf (dog_years, "%.0f", years);

  gtk_entry_set_text (text, dog_years);

  printf ("Years: %.0f\n", years);

  }



int main( int argc,

          char *argv[] )

{

  GtkWidget *window;

  GtkWidget *vbox;

  GtkWidget *vboxr;

  GtkWidget *button;

  GtkWidget *text;

  GtkWidget *radiocat;

  GtkWidget *radiodog;

  GSList *group;



  gtk_init (&argc, &argv);



  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);

  g_signal_connect (G_OBJECT (window), "destroy",

                    G_CALLBACK (destroy), NULL);

  gtk_container_set_border_width (GTK_CONTAINER (window), 2);



  vbox = gtk_vbox_new (TRUE, 0);

  gtk_widget_show (vbox);

  vboxr = gtk_vbox_new (TRUE,0);

  gtk_widget_show (vboxr);



  text = gtk_entry_new();

  gtk_widget_show (text);



  button = gtk_button_new_with_label ("To dog years");

  g_signal_connect (G_OBJECT (button), "clicked",

                    G_CALLBACK (to_dog), (gpointer) text);

  gtk_widget_show (button);



  radiocat = gtk_radio_button_new_with_label (NULL, "Cat years");

  gtk_box_pack_start (GTK_BOX (vboxr), radiocat, FALSE, FALSE, 0);

  gtk_widget_show (radiocat);



  group = gtk_radio_button_get_group (GTK_RADIO_BUTTON (radiocat));

  radiodog = gtk_radio_button_new_with_label (group, "Dog years");

  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (radiodog), TRUE);

  gtk_box_pack_start (GTK_BOX (vboxr), radiodog, FALSE, FALSE, 0);

  gtk_widget_show (radiodog);

  gtk_widget_show (vboxr);



  gtk_box_pack_start (GTK_BOX (vbox), text, FALSE, FALSE, 0);

  gtk_box_pack_start (GTK_BOX (vbox), vboxr, FALSE, FALSE, 0);

  gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);



  gtk_container_add (GTK_CONTAINER (window), vbox);



  gtk_widget_show (window);



  gtk_main();



  return 0;

}

i need to check the state of the radiocat widget from the function to_dog using the function "gtk_toggle_button_get_active (GTK_TOGGLE_BUTTON (radiocat))" but as i said, im not sure how to access this variable from the function to_dog

cheers

mofofish