(in-package :qt)

(defparameter *app* (make-instance 'qlisp-application))

(defparameter *hello* (make-instance 'qpush-button
                                     :text (make-instance 'qstring
                                                          :ch "Hello world!")))

(qwidget-resize *hello* 100 30)
(qwidget-show *hello*)

(qapplication-exec)

(sb-ext:quit)

In the future, it is expected that Lisp strings will be automagically converted to qstrings when/where necessary. So the obvious ugliness of (make-instance 'qstring :ch "Foo") will go away.