A convenient message window.
GtkMessageDialog presents a dialog with an image representing the type of message (Error, Question, etc.) alongside some message text. It's simply a convenience widget; you could construct the equivalent of GtkMessageDialog from GtkDialog without too much effort, but GtkMessageDialog saves typing.
The easiest way to do a modal message dialog is to use run() , though you can also pass in the Gtk::DIALOG_MODAL flag, run() automatically makes the dialog modal and waits for the user to respond to it. run() returns when any dialog button is clicked or the dialog is closed.
set_markup() Set pango-marked up text.