Re: class declaration of a signal function in c++

[Jeff Franks <adsln7hl tpg com au>]

philip dahlquist wrote:
> i'm having trouble with the declaration/definition of a gtk signal function inside a c++ class.
>
> CreateTreeItem(...) is the member function that calls the signal function
> and below it is the class definition of the signal function, SelectItem(...)
>
> /**********************/
> /**********************/
> GtkWidget*
> Dirpane::CreateTreeItem(char *txt, GtkWidget *tree)
> {
>         GtkWidget *itemnew;
>         char buffer[256];
>         
>         strcpy(buffer, txt);
>         
>         itemnew = gtk_tree_item_new_with_label(txt);
>         gtk_tree_append(GTK_TREE(tree), itemnew);
>         gtk_widget_show(itemnew);
>         gtk_signal_connect(GTK_OBJECT(itemnew), "select",
>                    GTK_SIGNAL_FUNC(SelectItem), g_strdup(buffer));
>
>         return(itemnew);
> }
> /**********************/
> /**********************/
> void
> Dirpane::SelectItem(GtkWidget *wgt, gpointer data)
> {
>         cout << "item selected: " << (char *)data << endl;
> }
> /**********************/
> /**********************/
>
> when i compile the class this is the error message the compiler generates:
>
> ------------
> dirpane.cpp: In method `GtkWidget *Dirpane::CreateTreeItem (char *, 
> GtkWidget *)':
> dirpane.cpp:157: no matches converting function `SelectItem' to type 
> `void (*) ()'
> dirpane.h:27: candidates are: void Dirpane::SelectItem (GtkWidget *, 
> void *)
> ------------
>
>
> i tried putting the class name and the binary scope resolution op
> in there and the compiler liked that a little better, but still no joy
>
> GTK_SIGNAL_FUNC(&Dirpane::SelectItem)
>
> the problem is that what i'm trying to do makes more sense doing it in c++
> rather than doing it in c

Phillip, you did declare SelectItem in your class declration as "static" 
 didn't you?

static void SelectItem(GtkWidget *wgt, gpointer data);

Jeff.