GTK+ FAQ
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# How do I get the Window ID of a GtkWindow? [GTK 2.x]

The actual Gdk/X window will be created when the widget gets realized. You can get the Window ID with:

    #include <gdk/gdkx.h>

    Window xwin = GDK_WINDOW_XWINDOW (GTK_WIDGET (my_window)->window);

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