使用Boost::Log记录日志

最新推荐文章于 2025-11-13 00:00:00 发布

原创最新推荐文章于 2025-11-13 00:00:00 发布 · 991 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#开源软件

Win32软件开发专栏收录该内容

15 篇文章

订阅专栏

该代码示例展示了如何使用Boost.Log库在C++中配置日志系统，将日志信息写入文件并按照日期和时间进行滚动，每天结束时自动创建新文件。日志文件保存在./logs目录下，且当达到一定大小或磁盘空间不足时会进行清理。主要涉及的日志级别、文件命名规则、文件大小限制和自动刷新功能。

使用Boost的Log库，将日志信息写入文件，日志将按时间滚动。详见代码：

#include <boost/date_time/posix_time/posix_time_types.hpp>
#include <boost/log/core.hpp>
#include <boost/log/expressions.hpp>
#include <boost/log/sinks/sync_frontend.hpp>
#include <boost/log/sinks/text_ostream_backend.hpp>
#include <boost/log/sources/record_ostream.hpp>
#include <boost/log/sources/severity_logger.hpp>
#include <boost/log/support/date_time.hpp>
#include <boost/log/utility/setup/file.hpp>
#include <boost/log/utility/setup/common_attributes.hpp>
#include <boost/log/trivial.hpp>

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 init_log_lib()
{
    auto sink = logging::add_file_log(
        keywords::file_name = "%Y%m%d_%4N.log",
        keywords::rotation_size = 5 * 1024 * 1024,
        keywords::time_based_rotation = 
        sinks::file::rotation_at_time_point(23,59,59),
        keywords::format = (
            expr::stream<< expr::format_date_time<boost::posix_time::ptime>("TimeStamp",
            "%Y-%m-%d %H:%M:%S") << " <" <<logging::trivial::severity<<
            "> "<<expr::smessage
            )
    );

    sink->locked_backend()->set_file_collector(
        sinks::file::make_collector(
            keywords::target = "./logs",
            keywords::max_size = 500*1024*1024,
            keywords::min_free_space = 800*1024*1024
        )
    );

    sink->locked_backend()->auto_flush(true);
    sink->locked_backend()->scan_for_files();

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

    logging::add_common_attributes();
}

void close_log_lib()
{
    logging::core::get()->remove_all_sinks();
}

void log_msg(const std::string& msg)
{
    src::severity_logger_mt<logging::trivial::severity_level> lg;
    BOOST_LOG_SEV(lg, logging::trivial::info) << msg;
}

int main()
{
    init_log_lib();
    log_msg("Hello World!\n");

    close_log_lib();
    return 0;
}