How to access InstallDirRegKey in NSIS

Question

I can specify installation directory and registry value in NSIS like this:

InstallDir "$PROGRAMFILES\CTVI"
InstallDirRegKey HKLM "Software\CTVI" "Install_Dir"

Now I can access InstallDir by using the notation $INSTDIR throughout the script. How do I similarly access InstallDirRegKey? Is there a similar notation as there exists for InstallDir? I tried $INSTDIRREGKEY but that is not. Now what I do is that I type HKLM "Software\CTVI" "Install_Dir" everytime I require it. But that is not so DRY :)

Answer 1

When the InstallDirRegKey attribute is used, NSIS will look-up the specified registry entry at startup and if it finds a path there it will place that value in $Instdir before any of your code runs...