cprintflog4cplus

Can I use printf format when using log4cplus?

Does log4cplus gives an API to print in C-Style / printf format?

Reason: I would like to use log4cplus in C code (in addition to C++) and don't want to prepare the string before hand.

Solution

  • All the logging macros have an FMT variant that does what you expect:

    LOG4CPLUS_WARN_FMT(logger, "Hello %s %d", "World", 1);

    Compare/contrast with the "default" variant, which uses C++ streams:

    LOG4CPLUS_WARN(logger, "Hello " << "World " << 1);

    There's also an _STR variant which can be used to output an std::string if you have it ready (without paying for the overhead of a C++ string stream).