Hi,
This is my first attempt to use Gtk (version 2.12.11). So I used Gladeto create my GUI and used GtkBuilder and Vala as programming language.
For the moment, I only tried a very simple thing: show the main windowusing GtkBuilder. The code is as follows:
public class Main{
private static MailBrowser app;
public static int main (string[] args) { Gtk.init (ref args); app = new MailBrowser(); app.run();
return 0; }}
public class MailBrowser {
private Gtk.Builder builder; private Gtk.Widget main_window;
construct { try { builder = new Gtk.Builder(); builder.add_from_file("MailBrowser.ui"); main_window = (Gtk.Widget) builder.get_object("main_window"); main_window.destroy += Gtk.main_quit; } catch (GLib.Error err) { var msg = new Gtk.MessageDialog ( null, Gtk.DialogFlags.MODAL, Gtk.MessageType.ERROR, Gtk.ButtonsType.CANCEL, "Failed to load UI\n" + err.message); msg.run(); Gtk.main_quit(); } } public void show_all(){ main_window.show_all(); } public void run(){ show_all(); Gtk.main(); }
}
Compilation runs fine, but when I execute the program I get:
(MailBrowser:9851): Gtk-CRITICAL **: gtk_widget_show_all: assertion `GTK_IS_WIDGET (widget)' failed
Then, nothing happens. I suppose the program is waiting for the mainwindow to be closed, but since the above error prevert the main windowto be shown, nothing happens.Ctrl-C quits the program.
I don't think there is a problem in my xml ui description file. itlooks like:
<?xml version="1.0"?><interface> <requires lib="gtk+" version="2.12"/> <object class="GtkWindow" id="main_window"> <child> <!-- .. --> </child> </object></interface>
Is there a solution?
Thanks.
Mildred
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