Anyone, Would someone show me what I am doing wrong setting up this logger? I posted on the boost log site too but got no reply there either. Thanks, Vic

Hello everyone!

How to create a text_file_backend that appends to existing log file and also has rotation. The init function below always creates a new file every time I run my program no matter the rotation settings.

I am using svn version 774 (latest as of Dec 5, 2012. I tried many ways but no joy. There is not an example like this, and there does not seem to be a test for appending either, so maybe it is not supported, but that would be bad. So I must be doing something wrong.

Here is my function to set up the logger (using my custom severity levels):

void init() { typedef boost::log::sinks::synchronous_sink<boost::log::sinks::text_file_backend > FileSink_t;

boost::shared_ptr< FileSink_t> mySink(new FileSink_t( boost::log::keywords::file_name = "%Y%m%d_%H%M%S_%5N.log" , boost::log::keywords::rotation_size = 16 * 1024 * 1024 /3 , boost::log::keywords::time_based_rotation =boost::log::sinks::file::rotation_at_time_point(0,0,0) , boost::log::keywords::auto_flush = true , boost::log::keywords::open_mode=(std::ios::out |std::ios::app) // seems to have no effect ));

// this method of setting append does not seem to work either, so Imust be doing something wrong mySink->locked_backend()->set_open_mode(std::ios::out|std::ios::app);

mySink->locked_backend()->set_file_collector(boost::log::sinks::file::make_collector( boost::log::keywords::target = "logs" , boost::log::keywords::max_size = 16 * 1024 * 1024 , boost::log::keywords::min_free_space = 2 * 16 * 1024 * 1024));

mySink->set_filter(boost::log::filters::attr< LOGGING::LOG_LEVEL("Severity", std::nothrow) >= LOGGING::warning); mySink->locked_backend()->scan_for_files(); mySink->set_formatter( boost::log::formatters::format("[%1% | %2%] %3%") % boost::log::formatters::date_time< boost::posix_time::ptime("TimeStamp") % boost::log::formatters::attr< LOGGING::LOG_LEVEL >("Severity",std::nothrow) % boost::log::formatters::message());

boost::log::core::get()->add_sink(mySink); boost::log::core::get()->add_global_attribute("TimeStamp",boost::log::attributes::local_clock()); }