Hello everyone!<br><br>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.<br><code><br></code>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.<br>
<br>Here is my function to set up the logger (using my custom severity levels):<br><br>void init()
<br>   {
<br>   typedef boost::log::sinks::synchronous_sink&lt; boost::log::sinks::text_file_backend &gt; FileSink_t;
<br> <br>   boost::shared_ptr&lt; FileSink_t&gt; mySink(
<br>            new FileSink_t(
<br>                  boost::log::keywords::file_name = &quot;%Y%m%d_%H%M%S_%5N.log&quot;
<br>                , boost::log::keywords::rotation_size = 16 * 1024 * 1024 /3
<br>                , boost::log::keywords::time_based_rotation = boost::log::sinks::file::rotation_at_time_point(0,0,0)
<br>                , boost::log::keywords::auto_flush = true
<br>                , boost::log::keywords::open_mode=(std::ios::out | std::ios::app) // seems to have no effect
<br>                ));
<br>     <br>    // this method of setting append does not seem to work either, so I must be doing something wrong
<br>    mySink-&gt;locked_backend()-&gt;set_open_mode(std::ios::out|std::ios::app);
<br> <br>    mySink-&gt;locked_backend()-&gt;set_file_collector(boost::log::sinks::file::make_collector(
<br>              boost::log::keywords::target = &quot;logs&quot;
<br>            , boost::log::keywords::max_size = 16 * 1024 * 1024
<br>            , boost::log::keywords::min_free_space = 2 * 16 * 1024 * 1024 ));
<br>     <br>    mySink-&gt;set_filter(boost::log::filters::attr&lt; LOGGING::LOG_LEVEL &gt;(&quot;Severity&quot;, std::nothrow) &gt;= LOGGING::warning);
<br> <br>    mySink-&gt;locked_backend()-&gt;scan_for_files(); mySink-&gt;set_formatter(
<br>          boost::log::formatters::format(&quot;[%1% | %2%] %3%&quot;)
<br>        % boost::log::formatters::date_time&lt; boost::posix_time::ptime &gt;(&quot;TimeStamp&quot;)
<br>        % boost::log::formatters::attr&lt; LOGGING::LOG_LEVEL &gt;(&quot;Severity&quot;, std::nothrow)
<br>        % boost::log::formatters::message() );
<br>     <br>    boost::log::core::get()-&gt;add_sink(mySink);
<br>    boost::log::core::get()-&gt;add_global_attribute(&quot;TimeStamp&quot;, boost::log::attributes::local_clock());
<br>    }
<br><br>