An implementation of Appender that appends to a file on disk. A new file is opened at the start of each rolling time period, which may be an hour, a day or a week. This approach prevents the log file from building up to a huge size.
class psl::log::RollingFileAppender : public Appender |
The name of the log file is constructed by the appender object by substituting the current date/time for the characters %t.
The formats shown below are used for the substitutions.
| Period | Format |
|---|---|
| Hour | YYYYMMDD_HH |
| Day | YYYYMMDD |
| Month | YYYYMM |
Thus, for example, log files with the periods and names below might be expanded as shown at 2:00 pm on 12th April 2013.
| Period | Unexpanded | Expanded |
|---|---|---|
| Hour | C:\log_%t.txt | C:\log_20130412_14.txt |
| Day | %TMP%\excel_addin_log%t.log | C:\Temp\excel_addin_log20130412.log |
| Day | %TMP%\logs\log_for_%t.log | C:\Users\MyName\AppData\Local\Temp\log_for_201304.log |
Header: cpplog.h
Namespace: psl::log
RollingFileAppender Methods | cpplog.h | Logging (User Guide) | Appender class