Boost日志库的使用

电玩女神 2022-03-01 03:20 451阅读 0赞

作者：朱金灿

来源：[https://blog.csdn.net/clever101][https_blog.csdn.net_clever101]

使用VS2013新建一个MyLog类，代码如下：

log.h（类的声明）

#pragma once
    
    #include <string>
    #include <boost/log/trivial.hpp>
    
    
    #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 std::string & dir);
    
    	static void Log(const std::string& msg);
    
    	static boost::log::sources::severity_logger<boost::log::trivial::severity_level > s_slg;
    
    protected:
    
    private:
    
    };

log.cpp（类的实现）

#include "stdafx.h"
    #include "log.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 std::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, // 采用追加模式
    		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 std::string& msg)
    {
    	src::logger lg;
    	BOOST_LOG(lg) << msg;
    }

测试代码：

int _tmain(int argc, _TCHAR* argv[])
    {
    
    	MyLog log;
    	log.Init("F:\\Debug_x64");// 日志文件存放的路径
    	log.Log("start");
    
    
    	getchar();
    
    	return 0;
    }

生成的日志文件如下：

\[2019-03-21 11:23:34.292733 0x00002a1c \] start

\[2019-03-21 15:46:36.343623 0x00002870 \] start

[https_blog.csdn.net_clever101]: https://blog.csdn.net/clever101