CanvasInterfaceList::iterator iter;
for(iter=canvas_interface_list().begin();iter!=canvas_interface_list().end();iter++)
CanvasInterfaceList::iterator iter;
for(iter=canvas_interface_list().begin();iter!=canvas_interface_list().end();iter++)
set_file_name(file_name);
ret=save_canvas(file_name,canvas_);
set_file_name(file_name);
ret=save_canvas(file_name,canvas_);