boost日志使用说明

#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/console.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/date_time/posix_time/posix_time_types.hpp>
#include <boost/log/support/date_time.hpp>

bool g_nInitLog = false;
namespace logging = boost::log;
namespace sinks = boost::log::sinks;
namespace src = boost::log::sources;
namespace expr = boost::log::expressions;
namespace attrs = boost::log::attributes;
namespace keywords = boost::log::keywords;
void InitLog()
{
 //输出到文件
 auto pSink = logging::add_file_log
  (
  keywords::open_mode = std::ios::app,  //重启程序不删除日志
  keywords::file_name = "log/videosnapshow_%N.log",
  keywords::rotation_size=10*1024*1024,       //超过此大小自动建立新文件
  // keywords::time_based_rotation=sinks::file::rotation_at_time_point(0,0,0),   //每隔指定时间重建新文件
  // This makes the sink to write log records that look like this:
  keywords::format =
  (
  expr::stream
  << expr::format_date_time< boost::posix_time::ptime >("TimeStamp", "%Y-%m-%d, %H:%M:%S.%f")
  << " " << expr::attr< boost::log::aux::thread::id >("ThreadID")
  << ": <" << logging::trivial::severity
  << "> " << expr::smessage
  )
  );
 pSink->locked_backend()->auto_flush(true);//使日志实时更新 
 //pSink->imbue(std::locale("zh_CN.UTF-8")); // 本地化  
 logging::add_console_log();
 logging::add_common_attributes(); 
}

使用的时候

 

void InitLog();
extern bool g_nInitLog;

 

1.    BOOST_LOG_TRIVIAL(trace) << "A trace severity message";  
2.     BOOST_LOG_TRIVIAL(debug) << "A debug severity message";  
3.     BOOST_LOG_TRIVIAL(info) << "An informational severity message";  
4.     BOOST_LOG_TRIVIAL(warning) << "A warning severity message";  
5.     BOOST_LOG_TRIVIAL(error) << "An error severity message";  
6.     BOOST_LOG_TRIVIAL(fatal) << "A fatal severity message";  

 

设置过滤也简单。在initlog中设置

logging::core::get()->set_filter(logging::trivial::severity >= logging::trivial::info);