[wix-users] Burn: How to pass RegistrySearch result value to Custom Bootstrapper

[Farrukh Waheed]

In my Bundle code, I'm trying to use the result of a registry search to set
Variable to be used in my Custom Boostrapper:

     <util:RegistrySearch
      Id="ThirdPartyInstallDirSearch"
      Variable="THIRDPARTY_INSTALL_DIR"
      Root="HKLM"
      Key="SYSTEM\CurrentControlSet\Control\Session Manager\Environment"
      Value="OceanSoftDir"
      Result="exists"
      />

    <Variable Name="THIRDPARTY_INSTALL_DIR" Type="string"
Value="$(var.THIRDPARTY_INSTALL_DIR)"/>


But this would give an error:
Undefined preprocessor variable '$(var.THIRDPARTY_INSTALL_DIR)'

Basically, I want to pass the result of registry search to my custom
bootstrapper application.

Thanks