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POboost.log auto_flush files are not stored when app is crashed
 

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  1. POboost.log auto_flush files are not stored when app is crashed
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    <p>Recently I started to play with boost.log, and bumped into an issue that if an unhanded exception is thrown no log messages are written to the log file. I am using rolling text files and auto-flash option is set on.</p> <p>Here is the modified source from the samples:</p> <pre><code>#include &lt;stdexcept&gt; #include &lt;string&gt; #include &lt;iostream&gt; #include &lt;fstream&gt; #include &lt;functional&gt; #include &lt;boost/ref.hpp&gt; #include &lt;boost/bind.hpp&gt; #include &lt;boost/shared_ptr.hpp&gt; #include &lt;boost/date_time/gregorian/gregorian.hpp&gt; #include &lt;boost/date_time/posix_time/posix_time_types.hpp&gt; #include &lt;boost/thread/thread.hpp&gt; #include &lt;boost/thread/barrier.hpp&gt; #include &lt;boost/log/common.hpp&gt; #include &lt;boost/log/filters.hpp&gt; #include &lt;boost/log/formatters.hpp&gt; #include &lt;boost/log/attributes.hpp&gt; #include &lt;boost/log/sinks.hpp&gt; #include &lt;boost/log/utility/empty_deleter.hpp&gt; #include &lt;boost/log/utility/record_ordering.hpp&gt; namespace logging = boost::log; namespace attrs = boost::log::attributes; namespace src = boost::log::sources; namespace sinks = boost::log::sinks; namespace fmt = boost::log::formatters; namespace keywords = boost::log::keywords; using boost::shared_ptr; using namespace boost::gregorian; enum { LOG_RECORDS_TO_WRITE = 100, LOG_RECORDS_TO_WRITE_BEFORE_EXCEPTION = 10, THREAD_COUNT = 10 }; BOOST_LOG_DECLARE_GLOBAL_LOGGER(test_lg, src::logger_mt) //! This function is executed in multiple threads void thread_fun(boost::barrier&amp; bar) { // Wait until all threads are created bar.wait(); // Here we go. First, identify the thread. BOOST_LOG_SCOPED_THREAD_TAG("ThreadID", boost::thread::id, boost::this_thread::get_id()); // Now, do some logging for (unsigned int i = 0; i &lt; LOG_RECORDS_TO_WRITE; ++i) { BOOST_LOG(get_test_lg()) &lt;&lt; "Log record " &lt;&lt; i; if(i &gt; LOG_RECORDS_TO_WRITE_BEFORE_EXCEPTION) { BOOST_THROW_EXCEPTION(std::exception("unhandled exception")); } } } int main(int argc, char* argv[]) { try { typedef sinks::synchronous_sink&lt; sinks::text_file_backend &gt; file_sink; shared_ptr&lt; file_sink &gt; sink(new file_sink( keywords::file_name = L"%Y%m%d_%H%M%S_%5N.log", // file name pattern keywords::rotation_size = 10 * 1024 * 1024, // rotation size, in characters keywords::auto_flush = true // make each log record flushed to the file )); // Set up where the rotated files will be stored sink-&gt;locked_backend()-&gt;set_file_collector(sinks::file::make_collector( keywords::target = "log" // where to store rotated files )); // Upon restart, scan the target directory for files matching the file_name pattern sink-&gt;locked_backend()-&gt;scan_for_files(); sink-&gt;locked_backend()-&gt;set_formatter( fmt::format("%1%: [%2%] [%3%] - %4%") % fmt::attr&lt; unsigned int &gt;("Line #") % fmt::date_time&lt; boost::posix_time::ptime &gt;("TimeStamp") % fmt::attr&lt; boost::thread::id &gt;("ThreadID") % fmt::message() ); // Add it to the core logging::core::get()-&gt;add_sink(sink); // Add some attributes too shared_ptr&lt; logging::attribute &gt; attr(new attrs::local_clock); logging::core::get()-&gt;add_global_attribute("TimeStamp", attr); attr.reset(new attrs::counter&lt; unsigned int &gt;); logging::core::get()-&gt;add_global_attribute("Line #", attr); // Create logging threads boost::barrier bar(THREAD_COUNT); boost::thread_group threads; for (unsigned int i = 0; i &lt; THREAD_COUNT; ++i) threads.create_thread(boost::bind(&amp;thread_fun, boost::ref(bar))); // Wait until all action ends threads.join_all(); return 0; } catch (std::exception&amp; e) { std::cout &lt;&lt; "FAILURE: " &lt;&lt; e.what() &lt;&lt; std::endl; return 1; } } </code></pre> <p>Source is compiled under Visual Studio 2008. boost.log compiled for boost 1.40.</p> <p>Any help is highly appreciated.</p>
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    1. COI tried your code, it worked for me. But you only expect log messages before exception happens, don't you?
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