Edit Question - KnowledgeHub

Title Body

I'm getting started with Gtk+, I'm following this tutorial how to make first application, but when I try to run the executable, I get this error: Gtk-Critical **: gtk_widget_show assertion GTK_IS_WIDGET(WIDGET) I can see on google a lot of people with same error, but I can't see the reply with how to fix this.. My C Code: #include <stdlib.h> #include <gtk/gtk.h> GtkBuilder *builder; GtkWidget *app; G_MODULE_EXPORT void on_app_destroy (void) { gtk_main_quit (); } G_MODULE_EXPORT void on_menu_quit_activate (void) { gtk_main_quit (); exit(EXIT_SUCCESS); } int main (int argc, char *argv[]) { /* Initialize GTK+ */ g_log_set_handler ("Gtk", G_LOG_LEVEL_WARNING, (GLogFunc) gtk_false, NULL); gtk_init (&argc, &argv); g_log_set_handler ("Gtk", G_LOG_LEVEL_WARNING, g_log_default_handler, NULL); builder = gtk_builder_new (); gtk_builder_add_from_file (builder, "tut.glade", NULL); app = GTK_WIDGET (gtk_builder_get_object (builder, "app")); gtk_builder_connect_signals (builder, NULL); g_object_unref (G_OBJECT (builder)); /* Enter the main loop */ gtk_widget_show (app); gtk_main (); return 0; } glad file: <?xml version="1.0"?> <glade-interface>   <widget class="GtkWindow" id="window1"> <child> <widget class="GtkFixed" id="fixed1"> <property name="visible">True</property> <child> <widget class="GtkButton" id="button1"> <property name="label" translatable="yes">button</property> <property name="width_request">113</property> <property name="height_request">42</property> <property name="visible">True</property> <property name="can_focus">True</property>

Tags (comma-separated) Cancel