[xsde-users] Get the currently parsed element's name

[Boris Kolpackov]

Hi Ninh,

Ninh Tran Dang <tdninh at tma.com.vn> writes:

> We tried with your new suggestion, it's ok when retrieving the element's
> name from the pre() with the "const char* name = _context ().element_name_"
> statement. But it got the segmentation fault when getting this from the
> post() method. Even we tried in the post() of element that doesn't contain
> the nested elements.
> 
> Do you know the reason why we got this error?

I think I do: post() is called after the end_element SAX even arrives
while the element name was saved in start_element. Expat (the underlying
parser) probably frees or reuses the name buffer after start_element
which makes it unusable. Sorry, I was too optimistic about types
without nested elements. 

After thinking some more about this, I believe this can be fixed by
adding a similar line of code to end_element_() in 
libxsde/xsde/cxx/parser/expat/document.cxx, after line 879, as we've 
added to start_element_():

context_.element_name_ = name_p;

This way the element name in the context will be restored for the
post() call. The really nice thing about it is that you can now
use _context ().element_name_ from post() even for types that have 
nested elements!

Boris