gtk:label-mnemonic-keyval (object)

object -- a gtk:label widget
keyval -- an unsigned integer for the keyval

The accessor for the mnemonic-keyval slot. If the label has been set so that it has a mnemonic key this function returns the keyval used for the mnemonic accelerator. If there is no mnemonic set up it returns #xffffff.

(setq label (gtk:label-new-with-mnemonic "_Print"))
=> #<gtk:label {1001A051E3}>
(gtk:label-mnemonic-keyval label) => 112