740104872d
Mention that QtMessageHandler needs to be reentrant, as well as other caveats. Mention QLoggingCategory, so people do know that they don't have to necessarily implement their own handler to filter messages (and that not all messages reach the handler). Also mention qFormatLogMessage(). Finally, give a more useful example for a custom message handler that logs to a file. Note that the example leaks a file handle at exit, but that is arguably not that bad. Pick-to: 6.5 Change-Id: I5be44167b266c9bbdbb0e94806bb024c9b352a32 Reviewed-by: Thiago Macieira <thiago.macieira@intel.com> (cherry picked from commit cb841b449a22d6646e148cd7e9d58be5ef5de27c) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>