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| <h2><a name="top">Frequently Asked Technical Questions</a><a name="Frequently_Asked_Technical_Questions"></a></h2> |
| <ol style="list-style-type: decimal"> |
| <li><a href="#custom_levels">How do I add a custom level to Apache log4cxx?</a></li> |
| <li><a href="#msvc_crash">My application on Windows crashes on shutdown?</a></li> |
| <li><a href="#unicode">Does Apache log4cxx support Unicode?</a></li></ol></div> |
| <dl> |
| <dt><a name="custom_levels">How do I add a custom level to Apache log4cxx?</a></dt> |
| <dd> |
| |
| <p>This is a common topic for all the Apache logging frameworks and |
| typically motivated to try to categorize events by functionality or |
| audience. An common request is to add an AUDIT level so that the |
| user can configure AUDIT level messages to go to a specific appender. |
| However, the logger name was designed explicitly to support |
| routing of messages by topic or audience. The common |
| pattern of using classnames for logger names obscures the more |
| general capability of logger name to represent the topic or audience |
| of the logging request. The easiest approach to solve the underlying issue |
| is to use a logger names like "AUDIT.com.example.MyPackage.MyClass" |
| that allow all AUDIT messages to be routed to a particular appender. |
| If you attempted to use a level for that then you would lose |
| the ability to distinguish between different significances within |
| the audit messages. |
| </p> |
| <p align="right"><a href="#top">[top]</a></p><hr /></dd> |
| <dt><a name="msvc_crash">My application on Windows crashes on shutdown?</a></dt> |
| <dd> |
| |
| <p>Apache log4cxx API calls use C++ Standard Template Library string |
| parameters. If the caller is using a different instance or type of the |
| C Runtime Library that log4cxx, then it is very likely that some memory |
| that was originally allocated by log4cxx would be freed by the caller. |
| If log4cxx and the caller are using different C RTL's, the program |
| will likely crash at the point. Use "Multithread DLL" with release |
| builds of log4cxx and "Multithread DLL Debug" with debug builds. |
| </p> |
| <p align="right"><a href="#top">[top]</a></p><hr /></dd> |
| <dt><a name="unicode">Does Apache log4cxx support Unicode?</a></dt> |
| <dd> |
| |
| <p>Yes. Apache log4cxx exposes API methods in multiple string flavors |
| const char*, std::string, wchar_t*, std::wstring, CFStringRef et al. |
| const char* and std::string are interpreted according to the |
| current locale settings. Applications should call setlocale(LC_ALL, "") |
| on startup or the C RTL will assume US-ASCII. |
| Before being processed internally, all these are converted to the |
| LogString type which is one of several supported Unicode representations |
| selected by the --with-logchar option. When using methods that take LogString arguments, |
| the LOG4CXX_STR() macro can be used to convert ASCII literals to |
| the current LogString type. FileAppenders support an encoding |
| property which should be explicitly specified to "UTF-8" or "UTF-16" |
| for XML files. |
| </p> |
| <p align="right"><a href="#top">[top]</a></p></dd></dl> |
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