Combo Box gives error messages

[Victor henri]

Hello

In the application I'm writing, I have included several Combo Boxes. They are 
all written like this:

main {
GtkWidget *pComboRange, *pFrame;
...
pFrame = gtk_frame_new("Zoom Range");
pComboRange = gtk_combo_box_new_text();
gtk_container_add(GTK_CONTAINER(pFrame), pComboRange);
gtk_box_pack_start(GTK_BOX(pHBox[4]), pFrame, TRUE, TRUE, 0);
gtk_combo_box_append_text(GTK_COMBO_BOX(pComboRange), "1000 Hz");
gtk_combo_box_append_text(GTK_COMBO_BOX(pComboRange), "2000 Hz");
gtk_combo_box_append_text(GTK_COMBO_BOX(pComboRange), "4000 Hz");
gtk_combo_box_set_active(GTK_COMBO_BOX(pComboRange), 2);
g_signal_connect( G_OBJECT(pComboRange), "changed", G_CALLBACK( 
cb_range_changed ), NULL );
...
}

Changing the value of the Combo Box call the function:

void cb_range_changed(GtkWidget *combo, gpointer data)
{
gint index = gtk_combo_box_get_active(GTK_COMBO_BOX(combo));
if (index == 0) {
zoomFactor = 1;
}
else if (index == 1) {
zoomFactor = 2;
}
else if (index == 2) {
zoomFactor = 4;
}
}

The app compiles OK and works exactly as  I want, but if I start the app in a 
terminal, I have these messages every time I use the Combo Boxes :

   GLib-GObject-WARNING **: invalid uninstantiatable type `(null)' in cast to 
`GObject'

   GLib-GObject-CRITICAL **: g_object_get_data: assertion `G_IS_OBJECT 
(object)' failed

This happens even if I compile it without the 'g_signal_connect' line, which 
shows, I guess, that the problem is in the 'main' file and not in the 
'cb_range_changed' function.

Please is this normal? Where does it come from? Should I fix something in my 
code?

Thank you very much

Victor

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RE: Change background color in GTK 3

[Victor henri]

Well I had the issue on ubuntu 11.10. On another machine using ubuntu 11.04 it 
works... 
Is it related to theme? Anyway should't gtk_widget_override_background_color 
override theme?

Victor

> Date: Mon, 13 Feb 2012 16:39:02 -0800
> From: nada...@hotmail.com
> To: gtk-list@gnome.org
> Subject: Change background color in GTK 3
> 
> 
> Hello
> 
> I would like to change the background of a button in GTK3
> 
> In GTK2, I was doing :
> 
> GdkColor color;
> gdk_color_parse ("gold",&color);
> gtk_widget_modify_bg(GTK_WIDGET(widget), GTK_STATE_NORMAL, &color);
> 
> and it was working perfectly.
> 
> In GTK3, I am doing :
> 
> GdkRGBA color;
> gdk_rgba_parse (&color, "orange");
> gtk_widget_override_background_color(GTK_WIDGET(widget),
> GTK_STATE_FLAG_NORMAL, &color);
> 
> and it doesn't work. I don't understand what I have missed
> 
> Thank you
> 
> -- 
> View this message in context: 
> http://old.nabble.com/Change-background-color-in-GTK-3-tp33319146p33319146.html
> Sent from the Gtk+ - General mailing list archive at Nabble.com.
> 
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RE: Change background color in GTK 3

[Victor henri]

Thank you Jean

Victor


> 
> This is https://bugzilla.gnome.org/show_bug.cgi?id=656461
> 
> Regards,
> Jean
> 

> > > 
> > > Hello
> > > 
> > > I would like to change the background of a button in GTK3
> > > 
> > > In GTK2, I was doing :
> > > 
> > > GdkColor color;
> > > gdk_color_parse ("gold",&color);
> > > gtk_widget_modify_bg(GTK_WIDGET(widget), GTK_STATE_NORMAL, &color);
> > > 
> > > and it was working perfectly.
> > > 
> > > In GTK3, I am doing :
> > > 
> > > GdkRGBA color;
> > > gdk_rgba_parse (&color, "orange");
> > > gtk_widget_override_background_color(GTK_WIDGET(widget),
> > > GTK_STATE_FLAG_NORMAL, &color);
> > > 
> > > and it doesn't work. I don't understand what I have missed
> > > 

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