Ksp reference Manual

3.13. read_persistent_var()
read_persistent_var()
Instantly reloads the value of a variable that was saved via the 
make_persistent()
command
Remarks
• This command can only be used within the init callback.
• The state of the variable is saved not only with the patch (or multi or host chunk), but also when
a script is saved as a KONTAKT preset (.nkp file).
• When replacing script code by copy and replacing the text, the values of persistent variables is
also retained.
• When working on more complex scripts, you might want to "flush" the variables by resetting the
script. You can do this by applying an empty script in the respective slot.
• You can also use the 
on persistence
callback for retrieving the values of persistent varia-
bles.
Variables
21
KSP Reference Manual

---

Examples
on init
declare ui_label $label (1,1)
declare ui_button $button
set_text($button,"$a := 10000")
declare $a
make_persistent($a)
{read_persistent_var($a)}
set_text ($label,$a)
end on
on ui_control ($button)
$a := 10000
set_text($label,$a)
end on
After applying this script, click on the button and then save and close the NKI. After reloading it,
the label will display 0 because the value of $a is initialized at the very end of the init callback. Now
remove the {} around read_persistent_var and apply the script again.
See Also
make_persistent()
on persistence_changed