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copied!<p>You declared <code>GtkWidget *statusbar</code> but the <code>gtk_statusbar_...</code> methods expect <code>GtkStatusbar *</code>: casting it with <code>GTK_STATUSBAR(statusbar)</code> removes the warnings. This is not a big issue as the program would work anyway: the biggest problem is you're using <code>info</code> without initializing it.</p> <p>The following code is working as expected here:</p> <pre><code>/* gcc -o status status.c $(pkg-config --cflags --libs gtk+-2.0) */ #include <gtk/gtk.h> int main (int argc, char *argv[]) { GtkWidget *window, *statusbar, *vbox; gchar *info; gtk_init(&argc, &argv); window = gtk_window_new(GTK_WINDOW_TOPLEVEL); gtk_widget_set_size_request(window, 250, -1); g_signal_connect(G_OBJECT(window), "destroy", G_CALLBACK(gtk_main_quit), NULL); statusbar = gtk_statusbar_new(); /* stack for info messages */ g_object_set_data(G_OBJECT(statusbar), "info", (gpointer) "1"); g_object_set_data(G_OBJECT(statusbar), "info", (gpointer) "2"); g_object_set_data(G_OBJECT(statusbar), "info", (gpointer) "3"); /* stack for warning messages */ g_object_set_data(G_OBJECT(statusbar), "warning", (gpointer) "A"); g_object_set_data(G_OBJECT(statusbar), "warning", (gpointer) "B"); g_object_set_data(G_OBJECT(statusbar), "warning", (gpointer) "C"); /* get id for the message at the top of the * info stack? */ guint id = gtk_statusbar_get_context_id(GTK_STATUSBAR(statusbar), "info"); /* show the top message from the info stack * ? */ info = "This was uninitialized"; gtk_statusbar_push(GTK_STATUSBAR(statusbar), id, info); vbox = gtk_vbox_new(FALSE, 5); gtk_box_pack_start_defaults(GTK_BOX (vbox), statusbar); gtk_container_add(GTK_CONTAINER(window), vbox); gtk_widget_show_all(window); gtk_main(); return 0; } </code></pre> <p>I don't know what are you trying to achieve with <code>g_object_set_data</code> though, but maybe they are only old tests...</p> <p><strong>Addendum:</strong></p> <p>You should use <code>gtk_statusbar_push()</code> to pile up messages on the status bar stack. With <code>gtk_statusbar_pop()</code> you'll remove the last pushed message, discovering the previous one.</p> <pre><code>gtk_statusbar_push(GTK_STATUSBAR(statusbar), id, "First message"); // Now the statusbar shows "First message" gtk_statusbar_push(GTK_STATUSBAR(statusbar), id, "Second message"); // Now the statusbar shows "Second message" gtk_statusbar_pop(GTK_STATUSBAR(statusbar), id); // Now the statusbar shows "First message" </code></pre>

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