TreeModel Problem

[Bob Caryl <bob fis-cal com>]

Hello Everyone,

I have had a strange experience working with a Gtk::TreeView.  I am 
representing a potential application menu with a Gtk::TreeStore for the 
purpose of allowing the user to edit the menu selections available.  One 
of the TreeStore columns is editable and is a boolean data type.  I 
initially display an entire menu configuration, and then I read in a 
file containing previously chosen options and I walk the TreeStore 
setting the boolean column to true in each appropriate row of the 
TreeStore.  I am using Gtk::TreeModel::foreach_iter to walk the tree 
searching for appropriate rows.

Here is the strange part:  If I accomplish the entire task in the 
constructor of my derived window, the application will crash with a 
seg-fault whenever I open up any top level elements in the TreeView.  
But, if I split the job up, i.e. I populate the TreeStore with all the 
default data, call window.show() and then call another function that 
walks the TreeStore setting the boolean columns in the appropriate rows 
to TRUE afterwards, all is well.

I am perfectly happy to do this in this way, but I am curious as to why 
it causes a seg-fault if the entire job is done in the window 
constructor.  I realize that this description is somewhat abstract, but 
after viewing the application stack backtrace in gdb I feel that my 
application in trying to set these boolean columns was trying to 
reference pointers that may not have been initialized.  The seg-fault 
always backtraced into the glibc malloc routine, btw.  Links to the 
source follow:

main.cpp <www.nehp.net/%7Ercaryl/main.cpp>
mnucfg.cpp <www.nehp.net/%7Ercaryl/mnucfg.cpp>
mnucfg.h <www.nehp.net/%7Ercaryl/mnucfg.h>

Thanks,
Bob Caryl