On Thu, Jun 17, 2010 at 09:07:46AM +0800, Gregory Hosler wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hi all, > > I have an application where I'm making use of animated gifs on a > GtkTextBuffer. > I set a timer (g_timeout_add()) to remove the animated character after a small > period of time (10 secs in this case). > > The argument to the timer callback includes a pointer to the text buffer > GtkTextChildAnchor in front of where I inserted my animation. The idea is that > inside the timeout, I insert a static copy of the gif, and do a > gtk_text_buffer_delete() of the iter's before and after the animation. > > This works about 99.999% of the time. > > In some rare circumstances, by the time that the timer callback is called, the > GtkTextChildAnchor has been deleted. > > To guard against this, I tested the GtkTextChildAnchor with > GTK_IS_TEXT_CHILD_ANCHOR(), but on occassion, I will get a segfault on the > GTK_IS_TEXT_CHILD_ANCHOR() (the address of the GtkTextChildAnchor is still a > valid address). > > I'm thinking that the GtkTextChildAnchor has been deleted, the memory used for > something else, and the GTK_IS_TEXT_CHILD_ANCHOR() is seg faulting as a > result. > > Question: how might I avoid this seg fault situation ? Will "GTK_IS_WIDGET()" > help to determine if the GtkTextChildAnchor is still alive before testing it > with GTK_IS_TEXT_CHILD_ANCHOR() ? or is there a better way of doing this ?
The standard rule is: if you permanently use an object take a reference with g_object_ref(). Then it can't be finalized unless you release the reference. See also the description of gtk_text_child_anchor_get_deleted(). You can get notified when an object is finalized, but this is not a case where you should do it. Yeti _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
