LOG_FatalError

program can’t continue, abort immediately

LOG_Error

a serious error, user must be informed about it

LOG_Warning

user is normally informed about it but may be ignored

LOG_Message

normal message (i.e. normal output of a non GUI app)

LOG_Status

informational: might go to the status line of GUI app

LOG_Info

informational message (a.k.a. ‘Verbose’)

LOG_Debug

never shown to the user, disabled in release mode

LOG_Trace

trace messages are also only enabled in debug mode

LOG_Progress

used for progress indicator (not yet)

LOG_User

user defined levels start here

LOG_Max