Problem with GTK+ Application

[apython1992]

Hello, I am writing a GTK+ application as part of a final project at school. To start, I wrote a toy application with simply a window that has one callback function, "on_window_destroy", just to work the kinks out before I add more widgets. However, when I try to run the program, I get the following error message:


(test.exe:1236): Gtk-CRITICAL **: gtk_widget_show: assertion `GTK_IS_WIDGET (widget)' failed

I am designing my application with Glade 3.6, which essentially builds an XML file that the C++ code parses, using GtkBuilder.

Here is the XML file created by Glade:

code:

<?xml version="1.0"?> <interface>   <requires lib="gtk+" version="2.16"/>   <!-- interface-naming-policy project-wide -->   <object class="GtkWindow" id="window">     <property name="title" translatable="yes">GTK+ Text Editor</property>     <signal name="destroy" handler="on_window_destroy"/>     <child>       <placeholder/>     </child>   </object> </interface>

And my C++ code:

code:

#include <stdlib.h> #include <gtk/gtk.h> void on_window_destroy(GtkObject *object, gpointer user_data) {     gtk_main_quit(); } int main(int argc, char *argv[]) {     GtkBuilder  *builder;     GtkWidget   *window;     gtk_init(&argc, &argv);     builder = gtk_builder_new();     gtk_builder_add_from_file(builder, "tutorial.xml", NULL);     window = GTK_WIDGET(gtk_builder_get_object(builder, "window"));     gtk_builder_connect_signals(builder, NULL);     g_object_unref(G_OBJECT(builder));     gtk_widget_show(window);     gtk_main();     return 0; }

I write my C++ code with codeblocks, and use the GNU GCC compiler, if that's relevant. Thank you in advance.

[wtd]

Any particular reason you hate yourself enough to use C++ for this?

Something like Vala would seem a better choice.

[apython1992]

Trust me, I have used GTK with Python before, and I agree, using it with C++ is a bit of a pain by comparison. However, as this is for a school project, I really have no choice but to use C++.

[apython1992]

I found the problem, thanks.