Wix: How to show the size of MSI packages in a burn managed UX

I have a Wix 3.6 managed bootstrapper in which the user can select individual packages to download and install. I want to show the download size of each package. How can I access the file size of each packages in the Bundle?

I guess this information is available somewhere in the Wix framework (because the file hashes are used to validate the downloaded files), but I did not find it.

I have an idea for a workaround, but it would be more implementation for me:

• Have a wxs file generated programmatically that contains Variable elements containing the file size of the packages. Those variables would be read by the bootstra开发者_JAVA百科pper.

When your bundle is created, a BootstrapperApplicationData.xml is added to the bundle. That XML file contains a lot of metadata about the bundle and contained packages. Your bootstrapper application code can load this file by looking in the same direcotry as your bootstrapper application dll lives.

I did not found how by using the burn API, but I implemented my own workaround:

If the local file is present
   query the file system
else
   query the web server