Re: Treeview CRITICAL Error

[dhk <dhkuhl optonline net>]

Carlos Pereira wrote:
> dhk wrote:
> > only seems to compile when the -O (Optimization) option is present.  
> > However the options is set as -O0 (that's Dash-Oh-Zero) which should 
> > turn optimization off. I'd like to be able to compile the program 
> > without optimization, but so far this has just been an annoyance.
> In my opinion every application should try to compile without warnings 
> AND run fine with -O0, -O2, -O3. If your app does not compile AND run 
> fine with -O0 to -O3 then you should stop and try to understand why. 
> Think about it as an opportunity to know better your application!
>
> Sometime ago, my app was behaving in a strange way when compiling with 
> -O3, although it worked fine with -O2. I tracked down the problem to 
> just 2, 3 lines of complex, cheesy code, separated by commas. Replacing 
> these 2, 3 lines by 4, 5 lines of simple, robust code, solved the issue.
> > Third - the problem.  The application window has a notebook with a 
> > handful of tabs, each with different tree views on them.  The program 
> > seems to run fine.  However, when the second tab is selected, no 
> > matter what the previous tab was, the following three error lines get 
> > printed about three times.
> I use a lot of notebooks and treeviews myself and they work fine. 
> Probably this is a problem of compatibility between your TreeViews and 
> TreeStores.
>
> Are you sure the number of columns and their type is right? the 
> treeviews are visible? the tree stores are visible? there is no 
> confusion between them when you change from one Treeview to another? do 
> you understand well the Treeview/TreeStore model?
> > Now the strange part.  The functions that call 
> > gtk_tree_store_prepend() and gtk_tree_view_set_cursor() get a tree 
> > view pasted in as a gpointer and then it's cast to a GtkWidget.  In 
> > the debugger when the tree view is printed it says "<value optimized 
> > out>" and when printed with a star '*' preceding the tree view it 
> > displays 0x0:  NULL.
> You can print the memory address of your treeviews, when you create 
> them, and then in a few selected places, for example:
>
> printf ("treeview in callback: %d\n", my_tree_view); /* ignore the 
> warning */
> fflush (stdout);
>
> to assert if you get always the memory address you expect. Otherwise 
> something is wrong.
>
> If you get NULL when you expected your treeview address, this is usually 
> an error easy to track down.
>
> Carlos
>
>
>
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Finally, I found the error.  I've gone through the treeviews and tree 
stores many times already.  I had it isolated to a specific function, 
but still couldn't find.  After revisiting the the treeview many times 
the problem was the column with the check box.  The enum being used in 
gtk_tree_view_insert_column_with_attributes() was CHECK_BOX when it 
should have been TIP_CHECK_BOX both are valid but have different values. 
 I stared at this many times and didn't notice the error.

This was a change made a few weeks ago before I put the program down to 
do taxes.  It cost a lot of time.

Thanks,

dave