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Determining UI Level from a Custom Action

A custom action in a UI sequence table or an external executable file may need the current user interface level of the installation. For example, a custom action that has a dialog box should only display the dialog when the user interface level is Full UI or Reduced UI, it should not display the dialog if the user interface level is Basic UI or None. You should use the UILevel property to determine the current user interface level. You cannot call MsiSetInternalUI from a custom action and it is not possible to change the UI level property from within a custom action.

It is recommended that custom actions not use the UI level as a condition for sending error messages to the installer because this can interfere with logging and external messages.

 

 

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