C# Signature:

        enum INSTALLLOGMODE  // bit flags for use with MsiEnableLog and MsiSetExternalUI
        public enum INSTALLLOGMODE  // bit flags for use with MsiEnableLog and MsiSetExternalUI
        {
            INSTALLLOGMODE_FATALEXIT = (1 << (INSTALLMESSAGE.INSTALLMESSAGE_FATALEXIT >> 24)),
            INSTALLLOGMODE_ERROR = (1 << (INSTALLMESSAGE.INSTALLMESSAGE_ERROR >> 24)),
            INSTALLLOGMODE_WARNING = (1 << (INSTALLMESSAGE.INSTALLMESSAGE_WARNING >> 24)),
            INSTALLLOGMODE_USER = (1 << (INSTALLMESSAGE.INSTALLMESSAGE_USER >> 24)),
            INSTALLLOGMODE_INFO = (1 << (INSTALLMESSAGE.INSTALLMESSAGE_INFO >> 24)),
            INSTALLLOGMODE_RESOLVESOURCE = (1 << (INSTALLMESSAGE.INSTALLMESSAGE_RESOLVESOURCE >> 24)),
            INSTALLLOGMODE_OUTOFDISKSPACE = (1 << (INSTALLMESSAGE.INSTALLMESSAGE_OUTOFDISKSPACE >> 24)),
            INSTALLLOGMODE_ACTIONSTART = (1 << (INSTALLMESSAGE.INSTALLMESSAGE_ACTIONSTART >> 24)),
            INSTALLLOGMODE_ACTIONDATA = (1 << (INSTALLMESSAGE.INSTALLMESSAGE_ACTIONDATA >> 24)),
            INSTALLLOGMODE_COMMONDATA = (1 << (INSTALLMESSAGE.INSTALLMESSAGE_COMMONDATA >> 24)),
            INSTALLLOGMODE_PROPERTYDUMP = (1 << (INSTALLMESSAGE.INSTALLMESSAGE_PROGRESS >> 24)), // log only
            INSTALLLOGMODE_VERBOSE = (1 << (INSTALLMESSAGE.INSTALLMESSAGE_INITIALIZE >> 24)), // log only
            INSTALLLOGMODE_EXTRADEBUG = (1 << (INSTALLMESSAGE.INSTALLMESSAGE_TERMINATE >> 24)), // log only
            INSTALLLOGMODE_LOGONLYONERROR = (1 << (INSTALLMESSAGE.INSTALLMESSAGE_SHOWDIALOG >> 24)), // log only    
            INSTALLLOGMODE_PROGRESS = (1 << (INSTALLMESSAGE.INSTALLMESSAGE_PROGRESS >> 24)), // external handler only
            INSTALLLOGMODE_INITIALIZE = (1 << (INSTALLMESSAGE.INSTALLMESSAGE_INITIALIZE >> 24)), // external handler only
            INSTALLLOGMODE_TERMINATE = (1 << (INSTALLMESSAGE.INSTALLMESSAGE_TERMINATE >> 24)), // external handler only
            INSTALLLOGMODE_SHOWDIALOG = (1 << (INSTALLMESSAGE.INSTALLMESSAGE_SHOWDIALOG >> 24)), // external handler only
            INSTALLLOGMODE_FILESINUSE = (1 << (INSTALLMESSAGE.INSTALLMESSAGE_FILESINUSE >> 24)), // external handler only
        }

User-Defined Types:

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