Re: g_free() vs gtk_widget_destroy()

[Jeff Franks <jcf tpg com au>]

Fabio Zanetta wrote:

> Hi,
>
> I cannot understand the difference between  g_free() and
> gtk_widget_destroy().
g_free() frees raw memory allocated with g_new(). gtk_widget_destroy() 
marks a widget for destruction when its reference count reaches zero. It 
also emits a "destroy" that is meant to any reference holders to a to 
drop the reference it's holding. A widget wont be destroyed until its 
reference count drops to zero.

> Someone can tell me this?
> (btw: I have always to call gtk_widget_destroy()? I see for example 
> that in
> the Hello World in the GTK tutorial it is not used.)
Yes it is. It is in the following line of code (helloworld.c)

g_signal_connect_swapped (G_OBJECT (button), "clicked",
                          G_CALLBACK (gtk_widget_destroy),
                          window);

This connects the button's clicked signal directly to the 
gtk_widget_destroy() function, passing gtk_widget_destroy() window as 
it's argument. When you click the button the window gets destroyed.


Jeff Franks.