In general, in your bundle you can define a Variable element as a string and
as Overridable=yes. Then pass the contents of the string variable to the
MSI using MsiProperty. The WixStdBA will pass command line entries that it
does not parse through to the BA.
<Variable Name='SomeVariable' Value='*' Type='string'
bal:Overridable='yes'/>
<MsiProperty Name='SOME_PROPERTY' Value='[SomeVariable]' />
Bundle.exe SomeVariable=MyValue
The WixStdBA can use a BAFunctions.dll which can be used to modify
SomeVariable in your BA. See wix src for samples.
If you implemented a managed BA, then there are more options on how to
approach this.
An issue might be that an on-demand launch of the msi would not use the BA,
so you might want to consider implementing a remember property pattern and
let the msi retrieve the data rather than requiring the data to be passed in
on the command line.
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