C# Signature:

        enum INSTALLMESSAGE
        {
            INSTALLMESSAGE_FATALEXIT = 0x00000000, // premature termination, possibly fatal OOM
            INSTALLMESSAGE_ERROR = 0x01000000, // formatted error message
            INSTALLMESSAGE_WARNING = 0x02000000, // formatted warning message
            INSTALLMESSAGE_USER = 0x03000000, // user request message
            INSTALLMESSAGE_INFO = 0x04000000, // informative message for log
            INSTALLMESSAGE_FILESINUSE = 0x05000000, // list of files in use that need to be replaced
            INSTALLMESSAGE_RESOLVESOURCE = 0x06000000, // request to determine a valid source location
            INSTALLMESSAGE_OUTOFDISKSPACE = 0x07000000, // insufficient disk space message
            INSTALLMESSAGE_ACTIONSTART = 0x08000000, // start of action: action name & description
            INSTALLMESSAGE_ACTIONDATA = 0x09000000, // formatted data associated with individual action item
            INSTALLMESSAGE_PROGRESS = 0x0A000000, // progress gauge info: units so far, total
            INSTALLMESSAGE_COMMONDATA = 0x0B000000, // product info for dialog: language Id, dialog caption
            INSTALLMESSAGE_INITIALIZE = 0x0C000000, // sent prior to UI initialization, no string data
            INSTALLMESSAGE_TERMINATE = 0x0D000000, // sent after UI termination, no string data
            INSTALLMESSAGE_SHOWDIALOG = 0x0E000000 // sent prior to display or authored dialog or wizard
        }

User-Defined Types:

None.

Alternative Managed API:

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Notes:

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