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I've been trying to build a simple interface with some spin buttons using Gtkmm 3.0. However, when I run my code I get errors like:
"(main:8242): Pango-CRITICAL **: pango_font_description_get_size: assertion `desc != NULL' failed (main:8242): Pango-CRITICAL **: pango_font_description_get_size: assertion `desc != NULL' failed (main:8242): Pango-CRITICAL **: pango_font_description_get_size: assertion `desc != NULL' failed (main:8242): Pango-CRITICAL **: pango_font_description_get_size: assertion `desc != NULL' failed (main:8242): Pango-CRITICAL **: pango_font_description_get_size: assertion `desc != NULL' failed (main:8242): Gtk-CRITICAL **: gtk_style_context_set_background: assertion `GDK_IS_WINDOW (window)' failed (main:8242): Gtk-CRITICAL **: gtk_style_context_set_background: assertion `GDK_IS_WINDOW (window)' failed (main:8242): Gtk-CRITICAL **: gtk_style_context_set_background: assertion `GDK_IS_WINDOW (window)' failed (main:8242): Gtk-CRITICAL **: gtk_style_context_set_background: assertion `GDK_IS_WINDOW (window)' failed (main:8242): Gtk-CRITICAL **: gtk_style_context_set_background: assertion `GDK_IS_WINDOW (window)' failed (main:8242): Gtk-CRITICAL **: gtk_style_context_set_background: assertion `GDK_IS_WINDOW (window)' failed (main:8242): Gtk-CRITICAL **: gtk_style_context_set_background: assertion `GDK_IS_WINDOW (window)' failed (main:8242): Gtk-CRITICAL **: gtk_style_context_set_background: assertion `GDK_IS_WINDOW (window)' failed". So, I went back to the examples and had a look at the SpinButton example in the documentation. This worked fine, so I started simplifying it until I had just one spin button and a frame in a box. Thus, the examplewindow.cc file looked like (main.cc and examplewindow.h were the same as in the example): #include "examplewindow.h" #include <iostream> #include <cstdio> ExampleWindow::ExampleWindow() : m_Frame_NotAccelerated("Not accelerated"), m_VBox_Main(false, 5), m_adjustment_day( Gtk::Adjustment::create(1.0, 1.0, 31.0, 1.0, 5.0, 0.0) ), m_SpinButton_Day(m_adjustment_day) { add(m_VBox_Main); m_VBox_Main.pack_start(m_Frame_NotAccelerated); m_VBox_Main.pack_start(m_SpinButton_Day); show_all_children(); } ExampleWindow::~ExampleWindow() { } This works fine, but if I comment out the line adding the frame to the main VBox then I get the error back. This is probably some feature of Gtk containers that I don't understand, but I had a look in the docs and couldn't see any obvious reasons. Any ideas? Tom |