Re: gtk combobox questions

[Anca Mitrica <ancamitrica yahoo com>]

--- Bob Caryl <bob fis-cal com> wrote:

> Anca Mitrica wrote:
> 
> >Hello,
> >
> >I am trying to attach a Gtk::ComboBox to a
> Gtk::Table,
> >in a dynamical way: the combobox list store is
> filled
> >with values read from different list<Glib::ustring>
> >(several if branches). The problem is that I
> receive a
> >segmentation fault each time I try to visualize the
> >combobox.
> >
> >Here is the code :
> > 
> >DirWindow.h file:
> >..................
> >class DirWindow{
> >	public:
> >		.............
> >	protected:
> >		//define class for tree model for combobox
> >		class ModelTree:public
> Gtk::TreeModel::ColumnRecord{
> >			public:
> >							
> >				ModelTree(){
> >					add(colName);
> >				}
> >				Gtk::TreeModelColumn<Glib::ustring> colName;		
> >		};
> >		 
> >	private:
> >          Glib::RefPtr<Gtk::ListStore> typelist;
> >          Gtk::ComboBox *combo ;
> >.......................
> >};
> >
> >DirWindow.cc file :
> >......................................
> >
> >void DirWindow::on_Combo_Name_Type(){
> >	Glib::ustring parname,partype,pardelim;
> >	
> >	Glib::ustring ns = getComboNameActive();
> >	Glib::ustring typesel = getComboTypeActive();
> >	
> >	//oxLabel = new Gtk::Label("0x");
> >	butAjouter->set_sensitive(true);
> >	delete intable;
> >	
> >	paramTableRowNumber = 1;
> >	intable = new
> Gtk::Table(paramTableRowNumber,3,true);
> >	intable->set_col_spacings(8);
> >	intable->set_row_spacings(8);
> >	
> >	if(typesel =="SES"){
> >		for(parseIterator=seslist.begin();parseIterator
> !=
> >seslist.end();parseIterator++){
> >			Glib::ustring elem = *parseIterator;
> >			Glib::ustring name =
> >elem.substr(0,elem.find_first_of("<",0));
> >			if((name == ns)||(name =="\t"+ns)){			
> >				//get all parameters for a directive in put
> thzm
> >into a list		
> >				tokenizeString(elem,"<");
> >				
> >				//li = list containing all parameters of a
> >directive
> >				for(p = li.begin();p != li.end();++p){
> >					//p =  a parameter with name type and
> delimiter
> >					Glib::ustring parameter = *p;
> >					tokenizeParameter(parameter);
> >					for(unsigned int i = 0;i<vecteur.size();i++){
> >						if(i == 0)
> >							parname = vecteur[i];
> >						else if(i == 1){	
> >							partype = vecteur[i];
> >						}else if(i == 2){
> >							pardelim = vecteur[i];
> >						}
> >					}
> >				
> >					
> >					paramTableRowNumber++;
> >				
> >					intable->resize(paramTableRowNumber,3);
> >				
> intable->set_resize_mode(Gtk::RESIZE_IMMEDIATE);
> >				
> >					newParameterName = new Gtk::Label(parname);	
> >					newParameterType = new
>
>Gtk::Label(Glib::ustring("(")+partype+Glib::ustring(")"));
> >				 	newParameterEntry = new Gtk::Entry();
> >					
> >					combo = new Gtk::ComboBox();
> >					
> >					typelist = Gtk::ListStore::create(columns);
> >					combo->set_model(typelist);
> >					
> >					for(parsetypeIterator =
>
>hexlist.begin();parsetypeIterator!=hexlist.end();++parsetypeIterator){
> >						Glib::ustring s = *parsetypeIterator;
> >						Gtk::TreeModel::Row firstrow =
> >*(typelist->append());
> >						firstrow[columns.colName] = s;
> >					}
> >					combo->pack_start(columns.colName);
> >				
>
>combo->signal_changed().connect(sigc::mem_fun(*this,&DirWindow::on_Combo_Type_Enum));
> >					combo->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,Gtk::FILL,Gtk::FILL,0,0);
> >						hb->show_all_children();
> >					
>
>intable->attach(*combo,2,3,paramTableRowNumber-1,paramTableRowNumber);
> >					}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);
> >					}		intable->queue_resize();	
> >				}
> >			}	
> >		}
> >	}
> >..............................................
> >
> >
> >The table also is updated dynamically.
> >
> >Does anyone has an idea about what's wrong with my
> >code? Or what could generate a seg fault?
> >
> >Thank you
> >
> >
> >
> >Anca Mitrica
> >
> >__________________________________________________
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> >
> >  
> >
> 
> In "DirWindow::on_Combo_Name_Type()" you delete
> "intable" and then you 
> reinstantiate it, attaching several widgets to it,
> but I do not see you 
> adding this table to a container (not even to your
> main app window).  
> You have potential memory leak problems with the
> various widgets you are 
> instantiating to put into the new intable widget.  I
> would suggest using 
> the "manage" method of your main application window
> when you instantiate 
> these widgets.  You might want to want until you
> finish initializing 
> typelist before you set it as the model for combo. 
> Beyond that, I do 
> not see anything that appears to be wrong with your
> construction of combo.
> 
> Perhaps you have left out a good deal of detail for
> the sake of brevity, 
> so I think it might be helpful if more information
> were available.
> 
> Bob Caryl
> 


Hi Bob,

All widgets that I used are properly instantiated and
attached to their containers. Also, the table used
here is attached to a Gtk::VBox of main Dialog. 
I don't have any problem if I choose to attach to this
table a Gtk::Label, instead of a Gtk::ComboBox, so the
problem is in attaching a combobox to a Gtk::Table. 

I am thinking there is a problem with the list store
model, but again, i did this operation before, in
other parts of my application, and it worked properly.


The problem is only in this function.

I removed a lot of code, in order to short the
message.





Anca Mitrica

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