WIX - Getting source files from an environment variable path

Question

I'am new to WIX, trying to create an msi with feature tree.

1. The installer should install all the assemblies in folder C:\ProgramFile\MyDir\MyApp.

2. Reading path from an environment variable called MyFolder.

   <WixVariable Id ="MyFolder" Value="[%MyFolder]"/>
   

3. Below is the code from where the assemblies are read.

   <Directory Id="TARGETDIR" Name="SourceDir">
   <Directory Id="ProgramFilesFolder" Name="ProgramFilesFolder">
   <Directory Id="ProgramFilesFolder.MyDIR" Name="MyDIR">
   <Directory Id="PROGRAMFILESFOLDER.MyDIR.MyApp" Name="MyApp">
   
   <Component Id="Component.aaa.dll" Guid="guid1">
     <File Id="aaa.dll" Source="..\..\OutPut\aaa.dll" />
   </Component>
   

4. Now I would like to get the assemblies from the folder MyFolder which is an environment variable and append it to my Source

   <Directory Id="MyFolder" Name="MyFolder" SourceName="MyFolder">
     <Component Id="Component.bbb.exe" Guid="guid2">
       <File Id="bbb.exe" Name="bbb.exe" Vital="yes" Source=MyFolder + bbb.exe />
     </Component>
   </Directory>
   

I receive a compilation error saying it is unable to find bbb.exe.

Please let me know on where I'm going wrong.

Answer 1

See the Preprocessor documentation. I think you can simply do this to get bbb.exe from a path defined in an environment variable:

<File Id="bbb.exe" Name="bbb.exe" Vital="yes" Source="$(env.MyFolder)bbb.exe" />