Entry widgets allow the user to enter text (surprisingly enough).

You can change the contents with the set_text() method, and read the current contents with the get_text() method.

Occasionally you might want to make an Entry widget read-only. This can be done by passing false to the set_editable() method.

For the input of passwords, passphrases and other information you don't want echoed on the screen, calling set_visibility() with false will cause the text to be hidden.

You might want to be notified whenever the user types in a text entry widget. Gtk::Entry provides two signals, activate and changed, for just this purpose. activate is emitted when the user presses the enter key in a text-entry widget; changed is emitted when the text in the widget changes. You can use these, for instance, to validate or filter the text the user types.

Reference