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Old 04-13-2004, 01:32 PM   #1
LQ Newbie
Registered: Dec 2003
Posts: 3

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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:

#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);


  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


Old 04-13-2004, 01:51 PM   #2
Registered: Mar 2004
Location: Massachusetts
Distribution: Debian
Posts: 557

Rep: Reputation: 42
IIRC, the last argument to g_signal_connect() is an arbitrary pointer which gets passed to the callback function. You can have it be a pointer to a structure with whatever stuff the function needs to run, including the radio button widget.

The other (lazy, bad) way is to just make the radio button widget a static global variable.


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