Re: [Boost-users] text_file_backend with append and rotate (Victor Yankee)

Subject: Re: [Boost-users] text_file_backend with append and rotate (Victor Yankee)
From: Victor Whiskey Yankee (victor.whiskey.yankee_at_[hidden])
Date: 2012-12-09 10:57:22

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());
>      }