Programmatically Select Sections Based on Dialog Choices?

Is it possible to programmatically select sections based on page/dialog choices?

Here's a minimal working example of something I'm trying:

!include Sections.nsh



Name "select1"

OutFile "select1.exe"

InstallDir C:\mwe

RequestExecutionLevel user



Page directory prior

Page instfiles



Function prior

   !insertmacro SelectSection Level1A

FunctionEnd



Section ""

   MessageBox MB_OK "Common Install"

SectionEnd



Section /o "Level 1 A" Level1A

   MessageBox MB_OK "Level 1 A"

SectionEnd

Why isn't section "Level1A" ever happening? If I remove the "/o", it happens. I can insert a messagebox into "prior" and verify that it is being invoked. The docs say to use something like "${Level1A}" in the SelectSection macro, but tho NSIS compiler just complains:

unknown variable/constant "{Level1A}" detected, ignoring (macro:SelectSection:4)

I assume I'm approaching the problem incorrectly. What's wrong with what I'm doing?

As the warning shows you, Level1A is not defined when you use it. You need to move your callback function after the section in your script.

Edit: Also it should be !insertmacro SelectSection ${Level1A} but going by that warning message, that's what you have put in your actual script 😉

Stu

Thanks. I didn't realize order was important. Perhaps I missed the part of the docs that distinguished between macros and variables and which components use what.