[glade--]text entry on glagemm

Hello!
i tried for some days to create a window with textentry and button that when press the butto,, the terminal printed the string in the entry on that time.
and i don't know how thw callback of the button know from where it need to get the text, in other words, how can i send the entry to the callback of the button. 
if someone had code, that made by glademm for that purpose, i will very happy if he will send it to me.
moti