Get an environment variable into a WIX property

Question

Is there a way to get an environment variable in WIX into a property?

I'm trying to get the USERPROFILE with:

Property Id="UserFolder"  Value="$(env.USERPROFILE)\EdwardsApp\MyFolder"

But this only picks up the USERPROFILE of the build machine, where the installer is built.

I want it to use the USERPROFILE of the machine where the app is being installed.

Answer 1

Alternative is to use SetProperty element - it will effectively create type 51 custom Action. It is simpler than using Custom Action as you don't need to separately specify the schedule for it - everything is done in one element. In my example below, I set the property only if its empty, i.e. was not passed from the command line.

Example:

<SetProperty Id="PROP_MYSOME"
             Before="InstallInitialize" 
             Sequence="execute"
             Value="[%USERDOMAIN]">
    <![CDATA[NOT Installed AND PROP_MYSOME=""]]>
</SetProperty>

Answer 2

You can make use of Environment variables during installation but this requires using a custom action. You will need to set the UserFolder property with a Type 51 Custom Action as opposed to setting the property during the build. The [%ENVVARNAME] format is used to make use of an environment variable, but the name of the environment variable is case-sensitive.

A WiX example of a custom action that sets a property:

<CustomAction Id="SetUserFolder" Property="UserFolder" Value="[%USERPROFILE]EdwardsApp\MyFolder" />

You can read more on Custom Actions in WiX here:

http://blogs.technet.com/b/alexshev/archive/2008/02/21/from-msi-to-wix-part-5-custom-actions.aspx