gtk/gtk_export.go
func goPrintSettings(key *C.gchar,
	value *C.gchar,
	userData C.gpointer) {

	id := int(uintptr(userData))

	printSettingsCallbackRegistry.Lock()
	r := printSettingsCallbackRegistry.m[id]
	// TODO: figure out a way to determine when we can clean up
	//delete(printSettingsCallbackRegistry.m, id)
	printSettingsCallbackRegistry.Unlock()

	r.fn(C.GoString((*C.char)(key)), C.GoString((*C.char)(value)), r.userData)

}
func goPrintSettings(key *C.gchar,
	value *C.gchar,
	userData C.gpointer) {

	id := int(uintptr(userData))

	printSettingsCallbackRegistry.Lock()
	r := printSettingsCallbackRegistry.m[id]
	// TODO: figure out a way to determine when we can clean up
	//delete(printSettingsCallbackRegistry.m, id)
	printSettingsCallbackRegistry.Unlock()

	r.fn(C.GoString((*C.char)(key)), C.GoString((*C.char)(value)), r.userData)

}
//export goPrintSettings