Re: gtk::combobox problems

[Antonio Coralles <noche suapie reflex at>]

Anca Mitrica wrote:

> Hi again,
>
> I did't solve the problem with attaching a
> Gtk::ComboBox to a Gtk::Table.
> I still receive a segmentation fault. Here is the
> message  from the debug operation:
>
> What makes me wonder is also the message "switching to
> thread  -164267296". Where this value comes from ??
>
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread -164267296 (LWP 4737)]
> 0xf67fd074 in g_type_create_instance () from
> /usr/lib/libgobject-2.0.so.0
> (gdb) up
> #1  0xf67e45a1 in g_object_new () from
> /usr/lib/libgobject-2.0.so.0
> (gdb) up
> #2  0xf67e383f in g_object_newv () from
> /usr/lib/libgobject-2.0.so.0
> (gdb) up
> #3  0xf67e4459 in g_object_new_valist () from
> /usr/lib/libgobject-2.0.so.0
> (gdb) up
> #4  0xf67e4578 in g_object_new () from
> /usr/lib/libgobject-2.0.so.0
> (gdb) up
> #5  0x0070b6bb in pango_layout_new (context=0x9e436c8)
> at pango-layout.c:210
> /home/amitrica/Desktop/librairies/pango-1.7.0/pango/pango-layout.c:210:5286:beg:0x70b6bb
> Current language:  auto; currently c
> (gdb) up
> #6  0xf6c3a232 in gtk_widget_create_pango_layout ()
> from /usr/lib/libgtk-x11-2.0.so.0
> (gdb) up
> #7  0xf6a988d5 in gtk_cell_renderer_text_new () from
> /usr/lib/libgtk-x11-2.0.so.0
> (gdb) up
> #8  0xf6a98ce3 in gtk_cell_renderer_text_new () from
> /usr/lib/libgtk-x11-2.0.so.0
> (gdb) up
> #9  0xf6e9951a in
> Gtk::CellRenderer_Class::get_size_vfunc_callback
> (self=0x9e41b20, widget=0x9e418e0, cell_area=0x0,
> x_offset=0x0, y_offset=0x0, width=0xfe400524,
> height=0xfe400528) at cellrenderer.cc:155
> /home/amitrica/Desktop/librairies/gtkmm-2.4.11/gtk/gtkmm/cellrenderer.cc:155:4682:beg:0xf6e9951a
> Current language:  auto; currently c++
> (gdb) up
> #10 0xf6a94cf2 in gtk_cell_renderer_get_size () from
> /usr/lib/libgtk-x11-2.0.so.0
> (gdb) up
> #11 0xf6a9a61b in gtk_cell_view_get_type () from
> /usr/lib/libgtk-x11-2.0.so.0
> (gdb) up
> #12 0xf6a9bca9 in gtk_cell_view_get_size_of_row ()
> from /usr/lib/libgtk-x11-2.0.so.0
> (gdb) up
> #13 0xf6abd040 in gtk_combo_box_set_model () from
> /usr/lib/libgtk-x11-2.0.so.0
> (gdb) up
> #14 0xf6f1e935 in
> Gtk::Widget_Class::size_request_callback
> (self=0x9e41830, p0=0x9e4184c) at widget.cc:3301
> /home/amitrica/Desktop/librairies/gtkmm-2.4.11/gtk/gtkmm/widget.cc:3301:93215:beg:0xf6f1e935
> (gdb) up
> #15 0xf67f8dcd in g_cclosure_marshal_VOID__BOXED ()
> from /usr/lib/libgobject-2.0.so.0
> (gdb) up
> #16 0xf67e06b2 in g_cclosure_new_swap () from
> /usr/lib/libgobject-2.0.so.0
> (gdb) up
> #17 0xf67e0347 in g_closure_invoke () from
> /usr/lib/libgobject-2.0.so.0
> (gdb) up
> #18 0xf67f6432 in g_signal_has_handler_pending () from
> /usr/lib/libgobject-2.0.so.0
> (gdb) up
> #19 0xf67f7cbc in g_signal_emit_valist () from
> /usr/lib/libgobject-2.0.so.0
> (gdb) up
> #20 0xf67f7e1c in g_signal_emit_by_name () from
> /usr/lib/libgobject-2.0.so.0
> (gdb) up
> #21 0xf6b8ae53 in gtk_size_group_remove_widget () from
> /usr/lib/libgtk-x11-2.0.so.0
> (gdb) up
> #22 0xf6b8b14d in gtk_size_group_remove_widget () from
> /usr/lib/libgtk-x11-2.0.so.0
> (gdb) up
> #23 0xf6c35a3f in gtk_widget_size_request () from
> /usr/lib/libgtk-x11-2.0.so.0
> (gdb) up
> #24 0xf6b11b6f in gtk_hbox_new () from
> /usr/lib/libgtk-x11-2.0.so.0
> (gdb) up
> #25 0xf6f1e935 in
> Gtk::Widget_Class::size_request_callback (self=0x0,
> p0=0x9e41de4) at widget.cc:3301
> /home/amitrica/Desktop/librairies/gtkmm-2.4.11/gtk/gtkmm/widget.cc:3301:93215:beg:0xf6f1e935
> (gdb) up
> #26 0xf67f8dcd in g_cclosure_marshal_VOID__BOXED ()
> from /usr/lib/libgobject-2.0.so.0
> (gdb)
>
>
> And the part of code that generates the seg fault is
> the following:
>
> newParameterName = new Gtk::Label(parname);     
>                                     newParameterType = new
> Gtk::Label(Glib::ustring("(")+partype+Glib::ustring(")"));
>                                     newParameterEntry = new Gtk::Entry();
>                                                   combParameter = new 
> Gtk::ComboBox();
> listtype = Gtk::ListStore::create(columns);
>                                     combParameter->set_model(listtype);
>                                     
> //je remplis la list pour le combo avec les types HEX
> qui se trouvent ds la hexlist
> for(parseit =
> hexlist.begin();parseit!=hexlist.end();parseit++){
>                                            Gtk::TreeModel::Row row = 
> *(listtype->append());
>                                            row[columns.colName] = 
> *parseit;
>                                     }
>                                     
> combParameter->pack_start(columns.colName);                                 
> combParameter->signal_changed().connect(sigc::mem_fun(*this,&DirWindow::on_Combo_Parameter));

Maybe i missed something, but i would connect signal_changed below this 
loop ...

>                                     //combParameter->set_active(0);
>                                            
> intable->attach(*newParameterName,0,1,paramTableRowNumber-1,paramTableRowNumber,Gtk::EXPAND,Gtk::EXPAND,0,0);
>                                     
> if(partype == "ENUM_HEX"){      
>         hb = new Gtk::HBox();
>         oxLabel = new Gtk::Label("0x");
>                                             
>     hb->pack_start(*oxLabel,Gtk::PACK_SHRINK);
>                                     
> hb->pack_start(*newParameterEntry,Gtk::PACK_SHRINK);
>                                     
> intable->attach(*hb,1,2,paramTableRowNumber-1,paramTableRowNumber);
>                                            //hb->show_all_children();
>                                     
> intable->attach(*combParameter,2,3,paramTableRowNumber-1,paramTableRowNumber,Gtk::FILL,Gtk::FILL,0,0);
>                                            
>                                     }else{
>                                     
> intable->attach(*newParameterEntry,1,2,paramTableRowNumber-1,paramTableRowNumber,Gtk::FILL,Gtk::FILL,0,0);
>                                     
> intable->attach(*newParameterType,2,3,paramTableRowNumber-1,paramTableRowNumber,Gtk::FILL,Gtk::FILL,0,0);
>                                     }      
>
> This code is put into a for loop, that makes the table
> resize automatically.
>
> Can anyone received this error since now, or has an
> idea about resolving this?

Is it possible that this function gets invoced as callback ? Maybe the 
actions you perform inside of this function trigger a callback which 
calls the function again, leading to an infinite recursion.

> Thank you.
>
>
>
>
>
>
> Anca Mitrica
>
>
>                
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