CAPI User Guide, Liquid Common Lisp Version 5.0
In order to let you know whether or not the dialog was cancelled, CAPI dialogs always return two values. The first value is the return value itself, and the second value ist
if the dialog returned normally andnil
if the dialog was cancelled.
The CAPI provides both a large set of predefined dialogs and the means to create your own. This chapter takes you through some example uses of the predefined dialogs, and then shows you how to create custom built dialogs.
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