why my format doesn't work in boost log

Question

I am using boost::log in this function:

#include <boost/log/core.hpp>
#include <boost/log/trivial.hpp>
#include <boost/log/expressions.hpp>
#include <boost/log/utility/setup/file.hpp>

void InitLog() {
  logging::core::get()->set_filter(logging::trivial::severity >= logging::trivial::debug);
  logging::add_file_log(
            keywords::file_name = AppHolder::Instance().config().log_folder + "/sign_%Y-%m-%d_%H-%M-%S.%N.log",
            keywords::rotation_size = 10 * 1024 * 1024,
            keywords::time_based_rotation = sinks::file::rotation_at_time_point(0, 0, 0),
            keywords::format = "%TimeStamp% (%LineID%) <%Severity%>: %Message%"
            );
}

Then, given the call:

BOOST_LOG_TRIVIAL(info) << "thread id: " << this_thread::get_id() << " Initialization succeeded";

Output is not as expected: timestamp, line id and severity are empty.

() <>: thread id: 7f58e30e8740 Initialization succeeded

score 16 · Answer 1 · answered Dec 04 '13 at 15:01

16

You have to register these attributes with the log core. Like this:

boost::log::add_common_attributes();

Or manually:

boost::log::core::get()->add_global_attribute("TimeStamp", boost::log::attributes::local_clock());
// etc...

answered Dec 04 '13 at 15:01

Igor R.

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score 4 · Accepted Answer · answered Dec 06 '13 at 09:00

4

After adding this, the problem was solved.

boost::log::register_simple_formatter_factory< boost::log::trivial::severity_level, char >("Severity");

Full code is located at my blog use boost log step 4

answered Dec 06 '13 at 09:00

Dean Chen

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70

One thing to notice in the linked blog post: it looks like you need to call `register_simple_formatter_factory` _before_ the call to `add_file_log`. (Arguably obvious, but I messed it up anyway.) – Spiro Michaylov Mar 07 '17 at 15:45

why my format doesn't work in boost log

2 Answers2