unit LoggerProConfig; interface uses LoggerPro; function Log: ILogWriter; implementation uses LoggerPro.FileAppender; var _Log: ILogWriter; function Log: ILogWriter; begin Result := _Log; end; initialization { The TLoggerProFileAppender has its defaults defined as follows: DEFAULT_LOG_FORMAT = '%0:s [TID %1:-8d][%2:-10s] %3:s [%4:s]'; DEFAULT_MAX_BACKUP_FILE_COUNT = 5; DEFAULT_MAX_FILE_SIZE_KB = 1000; You can override these dafaults passing parameters to the constructor. Here's some configuration examples: @longcode(# // Creates log in the same exe folder without PID in the filename _Log := BuildLogWriter([TLoggerProFileAppender.Create(10, 5, [TFileAppenderOption.LogsInTheSameFolder])]); // Creates log in the AppData/Roaming with PID in the filename _Log := BuildLogWriter([TLoggerProFileAppender.Create(10, 5, [TFileAppenderOption.IncludePID])]); // Creates log in the same folder with PID in the filename _Log := BuildLogWriter([TLoggerProFileAppender.Create(10, 5, [TFileAppenderOption.IncludePID])]); #) } // Creates log in the ..\..\ folder without PID in the filename _Log := BuildLogWriter([TLoggerProFileAppender.Create(10, 5, '..\..',[TFileAppenderOption.IncludePID])]); // Create logs in the exe' same folder // _Log := BuildLogWriter([TLoggerProFileAppender.Create(10, 5)]); // Creates log in the AppData/Roaming with PID in the filename // _Log := BuildLogWriter([TLoggerProFileAppender.Create(10, 5, // [TFileAppenderOption.IncludePID])]); // Creates log in the same folder with PID in the filename // _Log := BuildLogWriter([TLoggerProFileAppender.Create(10, 5, // [TFileAppenderOption.IncludePID])]); end.