Re: gtk_tree_model_get_iter segfault in on_row_activated

[blythe2 tcnj edu]

Iter needs to be an actual object, not just a pointer.  You are *creating*
a n iterator, then passing it by reference to be filled.  As your code
stands now, you're passing an uninitialized pointer to be written to,
which of course crashes.  Try the following:

void on_row_activated(GtkTreeView* tree_view,GtkTreePath*
path,GtkTreeViewColumn* column,gpointer user_data)
{
        std::cout<<"path was "<<gtk_tree_path_to_string(path)<<"\n";
        GtkTreeModel* model=gtk_tree_view_get_model(tree_view);
        if(model!=NULL)
                std::cout<<"got the model OK\n";
        else
                std::cout<<"failed to get the model\n";
        std::cout<<"trying to get the iter\n";
        GtkTreeIter iter;
        if(gtk_tree_model_get_iter(model,&iter,path)==TRUE)
                std::cout<<"got the iter ok\n";
        else
                std::cout<<"didn't get the iter\n";
}


That should work better.  Hope that helps!

-Nate


> I have connected to the row activated signal and want to handle it - so
> I am doing this:
>
> void on_row_activated(GtkTreeView* tree_view,GtkTreePath*
> path,GtkTreeViewColumn* column,gpointer user_data)
> {
>       std::cout<<"path was "<<gtk_tree_path_to_string(path)<<"\n";
>       GtkTreeModel* model=gtk_tree_view_get_model(tree_view);
>       if(model!=NULL)
>               std::cout<<"got the model OK\n";
>       else
>               std::cout<<"failed to get the model\n";
>       std::cout<<"trying to get the iter\n";
>       GtkTreeIter* iter;
>       if(gtk_tree_model_get_iter(model,iter,path)==TRUE)
>               std::cout<<"got the iter ok\n";
>       else
>               std::cout<<"didn't get the iter\n";
> }
>
> upon double-clicking an item in the list output looks something like (in
> this case the 4th entry)
>
> path was 3
> got the model OK
> trying to get the iter
> Segmentation fault
>
> although bizarrely it very occasionally works fine.
>
> Any ideas? It's a bit impolite to segfault when all the parameters I
> pass are at least existing
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