title: How to call an nsi function in uninstall section?
body: <p>I have an nsi script with a function that returns output that I'm trying to call inside the uninstall section. Unfortunately however when I run it I get errors apparently because of the way I call this function. My understanding is that there is a special way to call functions in the uninstall section but i'm not sure how and I was wondering if someone could help me? my code looks like this:  </p>
  
  <pre><code>Function TestFunction
     Push $R0
     Rush $R1
     ;do stuff
     Pop $R!
     Exch $R0
  FunctionEnd
  
  !macro TestFunction OUTPUT_VALUE
     Call TestFunction
     Pop `${OUTPUT_VALUE}`
  !macroend
  
  !define TestFunction'!insertmacro "TestFunction"' 
  
  ; Uninstaller
  
  Section "Uninstall"
    ${TestFunction} $R0
    StrCmp $R0 "Test" istest isnottest 
  </code></pre>