源代码说明： A log file component which is useful to log errors or other events to a log file. Allows an application to open, write and close a log file in one step or in multiple steps, logging the date and time logging was started and the date and time logging ended and in between the error messages. Also allows the original file to reach a set size and will then back up the log file with a .bak extension and then start a new log file. Useful for logging most any type of event.

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