boost log to print source code file name and line number

boost, boost-log, boost-logging, c++

Solution

I would suggest to use the `boost::log::add_value()` function.

Define:

#define LOG_LOCATION(LEVEL, MSG)      \
  BOOST_LOG_SEV(logger::get(), LEVEL)     \
    << boost::log::add_value("Line", __LINE__)          \
    << boost::log::add_value("File", __FILE__)          \
    << boost::log::add_value("Function", __FUNCTION__) << MSG

And then you can format it as follows:

boost::log::add_common_attributes();

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

auto syslog_format(
    boost::log::expressions::stream <<
        "["   << boost::log::expressions::format_date_time< boost::posix_time::ptime >("TimeStamp", "%Y-%m-%d %H:%M:%S") <<
        "] [" << boost::log::expressions::attr<boost::log::attributes::current_thread_id::value_type>("ThreadID") << 
        "] [" << std::left << std::setw(7) << std::setfill(' ') << boost::log::trivial::severity <<
        "] "  << boost::log::expressions::smessage <<
        " ("  << boost::log::expressions::attr<std::string>("Filename") <<
        ":"   << boost::log::expressions::attr<int>("Line") <<
        ":"   << boost::log::expressions::attr<std::string>("Function") <<
        ")"
);

boost::log::add_file_log(
    boost::log::keywords::file_name  = "sys_%d_%m_%Y.%N.log",
    boost::log::keywords::format = syslog_format
);

No need to add global attributes, and you can format it easily as seen above. I find this is a good compromise between other's solutions and the raw `__FILE__` `__LINE__` approach.

Full example here.

Problem

I'm using Boost(1.55.0) Logging in my C++ application. I have been able to generate log of this format ``` [2014-Jul-15 10:47:26.137959]: <debug> A regular message ``` I want to be able to add source file name and line number where the log is generated. ``` [2014-Jul-15 10:47:26.137959]: <debug> [filename:line_no] A regular message ``` example: ``` [2014-Jul-15 10:47:26.137959]: <debug> [helloworld.cpp : 12] A regular message ``` Source Code: ``` #include <boost/log/core.hpp> #include <boost/log/trivial.hpp> #include <boost/log/expressions.hpp> #include <boost/log/sinks/text_file_backend.hpp> #include <boost/log/utility/setup/file.hpp> #include <boost/log/utility/setup/common_attributes.hpp> #include <boost/log/sources/severity_logger.hpp> #include <boost/log/sources/record_ostream.hpp> #include <boost/log/expressions.hpp> #include <boost/log/support/date_time.hpp> #include <boost/log/attributes/attribute.hpp> #include <boost/log/attributes/attribute_cast.hpp> #include <boost/log/attributes/attribute_value.hpp> #include <boost/make_shared.hpp> #include <boost/property_tree/ptree.hpp> namespace logging = boost::log; namespace src = boost::log::sources; namespace sinks = boost::log::sinks; namespace keywords = boost::log::keywords; void init() { logging::add_file_log ( keywords::file_name = "sample_%N.log", /*< file name pattern >*/ keywords::rotation_size = 10*1024*1204, /*< rotate files every 10 MiB... >*/ keywords::time_based_rotation = sinks::file::rotation_at_time_point(0, 0, 0), /*< ...or at midnight >*/ keywords::format = ( boost::log::expressions::stream << boost::log::expressions::format_date_time< boost::posix_time::ptime >("TimeStamp", "%Y-%m-%d_%H:%M:%S.%f") << ": <" << boost::log::trivial::severity << "> " << boost::log::expressions::smessage ) ); } int main(int, char*[]) { init(); logging::add_common_attributes(); using namespace logging::trivial; src::severity_logger< severity_level > lg; BOOST_LOG_SEV(lg, debug) << "A regular message"; return 0; } ```

Original source

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