A formatting pattern is a text string containing one or more symbols, which will be substituted into the formatted output text. The symbols are listed below.
| Symbol | Description |
|---|---|
| %c | Logger name. |
| %d | Timestamp. |
| %F | File name of originating source file. |
| %l | Location of code that logged the event, including file name and line number.
Equivalent to %F(%L). |
| %L | Line number of code that logged the event. |
| %m | Message |
| %n | New line |
| %p | Severity level (i.e. ERROR, WARN, etc) |
| %r | Ticks - millisecs since originating computer was started. |
| %t | Thread ID. |
| %% | The percent symbol. |
Each symbol can be preceded by a width statement, in the form min
or min.max
where min and max are both integers, e.g.: %5p, %-10.20c,
%7.7t
The outputted field will be padded with spaces if it contains less than min characters.
If min is negative, then the padding will be on the right - i.e. the field will be
left-justified.
If min is positive, then the padding will be on the left - i.e. the field will be
right-justified.
If the field contains more than max characters, it will be truncated.
%-5p %c - %m%n
Prints the severity level of the event, left-justified, padded to 5 characters, followed by the name of the logger that initially received the event, the message itself, and finally a new-line.
ERROR MyClass - Something went very wrong WARN MyOtherClass - Something untoward occurred
%-20.20d %-5p %c - %m [%l]%n
Prints the time the event was raised, the severity level of the event (left-justified, padded to 5 characters), the name of the logger that initially received the event, the message itself, the line of code where te event was raised and finally a new-line.
Sat Feb 07 11:05:17 INFO RtdHandleServer.CTopicTable - CTopicTable: Remove topic {5ECBBA8B-EDF7-432E-B127-823F089FADF0}; count after = 0 [c:\source\topictable.h(166)]
Sat Feb 07 11:05:17 TRACE RtdHandleServer.CXllRtdHandleServer - CXllRtdHandleServer::DisconnectData() ends [c:\source\xllrtdhandleserver.cpp(248)]