Unable to connect signal and signal handler in Glade GTK+3

Question

Hi i'm working on a project in GTK+ 3 on Ubuntu 14.04 LTS. I'm trying to use Glade,but when i tried to connect a "toggled" signal of toggle button to a function called kaczka ,after compiling i got this in my console: (Gra_w_Statki:11072): Gtk-Warning**:Could not find signal handler 'kaczka. Did you compile with -rdynamic?

The window and the button render itself and work normally except of that toggling button doesn't change anything. What am i doing wrong ?

This is how i tried to connect toggle button and function Click!

My Linker Settings are : pkg-config --libs gtk+-3.0

And my compiler settings are: pkg-config --cflags gtk+-3.0

I'm using Code ::Blocks 13.12 with GCC compiler.

And this is my code:

#include <stdlib.h>
#include <gtk/gtk.h>
void kaczka (GtkToggleButton *tbutton, gpointer data)
{
    gtk_main_quit ();
}


int main (int argc, char *argv[])
{
  GtkWidget *win = NULL;
  GtkBuilder *builder;

  gtk_init (&argc, &argv);


builder=gtk_builder_new();
gtk_builder_add_from_file( builder, "kaczka.glade", NULL);

    win=GTK_WIDGET(gtk_builder_get_object(builder,"window1"));


gtk_builder_connect_signals( builder, NULL );
g_object_unref( G_OBJECT( builder ) );



  gtk_widget_show_all (win);
  gtk_main ();
  return 0;
}

Answer 1

Take a look at the gtk_builder_connect_signals() and gtk_builder_add_callback_symbol() documentation. Basically you need to either

• use gtk_builder_add_callback_symbol() on all callbacks before connecting the signals or
• link with gmodule-export-2.0 and use compile flags "-Wl,--export-dynamic" to export even unused symbols.

Answer 2

You can add more compiler settings with,

pkg-config --libs --cflags gmodule-2.0.

If anyone is building the program with meson, just add

gmoddep = dependency('gmodule-2.0')

to list of dependencies.

Answer 3

Add -rdynamic to export the function and make it visible to the loader.

> gcc pkg-config --cflags gtk+-3.0 -o kaczka kaczka.c pkg-config --libs gtk+-3.0

> ./kaczka

(kaczka:31686): Gtk-WARNING **: Could not find signal handler 'on_destroy'. Did you compile with -rdynamic?

> gcc pkg-config --cflags gtk+-3.0 -o kaczka kaczka.c pkg-config --libs gtk+-3.0 -rdynamic

> ./kaczka

No warning.

Answer 4

I think your kaczka.glade maybe makes wrong.

I used your .c source file and created my own .glade, and it ran well.

What version of Glade are you trying?

Run the latest version and see if it solves the problem.