Thank you so much, no more segfaults. On Tue, 2002-11-12 at 02:07, Gediminas Paulauskas wrote:
An, 2002-11-12 03:09, Jacob Perkins rašė:I have my own GObject called SeahorseWidget, which contains a GladeXML, plus some extra data. I've hooked up the finalize function to free the xml, then sets the xml to null. To create a new dialog, I create a new SeahorseWidget, which connect generic signals, such as when the cancel button is pressed. When the 'closed' signal calls g_object_unref on the SeahorseWidget, which then causes finalize to be called. The problem is that some dialogs can only have one instance at a time. I keep a static SeahorseWidget pointer in the dialog's source file. To check if an instance already exists, I check if the pointer is null, or if pointer->xml is null. If this does not fail, the I call gtk_window_present(glade_xml_get_widget (swidget->xml, swidget->name)), which gets the main window. Unfortunately, the instance test does not always fail when it should and I get segfaults from glade_xml_get_widget.Which is expected behavior. When widget is destroyed, swidget points to invalid memory address, and you cannot check if swidget->xml is NULL. it can be anything. However, for such cases a special method was added to Glib 2: g_object_add_weak_pointer. When object is finalized, it sets that pointer to NULL. It means that a pointer is valid only when an object is alive. So, make it: void seahorse_generate_show (SeahorseContext *sctx) { if (swidget != NULL) { gtk_window_present (GTK_WINDOW (glade_xml_get_widget (swidget->xml, swidget->name))); return; } swidget = seahorse_widget_new ("generate", sctx); g_object_add_weak_pointer (G_OBJECT (swidget), &swidget); -- Gediminas _______________________________________________ desktop-devel-list mailing list desktop-devel-list gnome org http://mail.gnome.org/mailman/listinfo/desktop-devel-list
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