boost.log在项目中应用

//头文件
#pragma once

#include <string>
#include <boost/log/trivial.hpp>


using std::string;

#define LOG_DEBUG
    BOOST_LOG_SEV((MyLog::s_slg),(boost::log::trivial::debug))
#define LOG_INFO
    BOOST_LOG_SEV((MyLog::s_slg),(boost::log::trivial::info))
#define LOG_ERROR
    BOOST_LOG_SEV((MyLog::s_slg),(boost::log::trivial::error))
#define LOG_WARNING
    BOOST_LOG_SEV((MyLog::s_slg),(boost::log::trivial::warning))
// 在使用之前必须先调用 init
// 使用方式  LOG_DEBUG<<"test string";
// 也可以用boost 中的宏  BOOST_LOG_TRIVIAL(info)<<"test msg";
class MyLog
{
public:
  MyLog();
  ~MyLog(void);
 
  // 在使用之前必须先调用此函数
  static void Init(const string & dir);
  static void Log(const string & msg );
  static boost::log::sources::severity_logger<boost::log::trivial::severity_level > s_slg;
protected:
private:

};

#include "MyLog.h"

#include <iostream>
#include <string>

#include <boost/filesystem.hpp>


#include <boost/log/sources/logger.hpp>
#include <boost/log/sources/record_ostream.hpp>
#include <boost/log/sources/global_logger_storage.hpp>
#include <boost/log/utility/setup/file.hpp>
#include <boost/log/utility/setup/common_attributes.hpp>
#include <boost/log/sinks/text_ostream_backend.hpp>
#include <boost/log/attributes/named_scope.hpp>
#include <boost/log/expressions.hpp>
#include <boost/log/support/date_time.hpp>
#include <boost/log/detail/format.hpp>
#include <boost/log/detail/thread_id.hpp>



namespace logging = boost::log;
namespace src = boost::log::sources;
namespace keywords = boost::log::keywords;
namespace sinks = boost::log::sinks;
namespace expr = boost::log::expressions;

BOOST_LOG_INLINE_GLOBAL_LOGGER_DEFAULT(my_logger, src::logger_mt)
boost::log::sources::severity_logger<boost::log::trivial::severity_level > MyLog::s_slg;

MyLog::MyLog()
{

}

MyLog::~MyLog(void)
{
 
}

void MyLog::Init(const string & dir)
{
  if (boost::filesystem::exists(dir) == false)
  {
    boost::filesystem::create_directories(dir);
  }

  auto pSink = logging::add_file_log
  (
      keywords::open_mode = std::ios::app,
      keywords::file_name = dir + "/%Y%m%d.log",
      keywords::rotation_size = 10 * 1024 * 1024,
      keywords::time_based_rotation = sinks::file::rotation_at_time_point(0, 0, 0), 
      //keywords::format = "[%TimeStamp% %ThreadID%]: %Message%"
      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
      )
  );
  // 如果不写这个 它不会实时的把日志写下去, 而是等待缓冲区满了,或者程序正常退出时写下,这样做的好处是减少IO操作.提高效率,  不过我这里不需要它. 因为我的程序可能会异常退出.
  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_common_attributes();
}


void MyLog::Log(const string & msg )
{
  src::logger lg;
  BOOST_LOG(lg) << msg;
}