Question

我需要一个Boost记录器，该记录器使用以下参数登录控制台（并稍后登录到文件）： “ [[％TimeStamp％] [％Severity％] [％File％（％Line％）]％Message％”。我已经阅读了Boost.Log v2文档，并从其他地方获得了一些“灵感”，但是我真的无法使它正常工作。

               '.InlineShapes.AddPicture(filePath, Type.Missing, Type.Missing, Type.Missing)

                'Dim objRng As Word.Range = .Range()
                'objRng.InlineShapes.AddPicture(filePath)

                'Dim objInlineShape As Word.InlineShape = objWordApp.Selection.InlineShapes.AddPicture(
                '    FileName:=filePath,
                '    LinkToFile:=False,
                '    SaveWithDocument:=True
                ')
                'objInlineShape.LockAspectRatio = Microsoft.Office.Core.MsoTriState.msoTrue
                'objInlineShape.Width = imgX
                'objInlineShape.Height = imgY

                '.Application.Selection.InlineShapes.AddPicture(filePath)

                'Dim objRng As Word.Range = .Sections(1).Range()
                'objRng.InlineShapes.AddPicture(filePath)
                '
                'Dim objInlineShape As Word.InlineShape = .InlineShapes.AddPicture(filePath)
                'Dim objShape As Word.Shape = objInlineShape.ConvertToShape()

                'objDoc.Bookmarks.Item("\startofdoc").Range.InlineShapes.AddPicture(filePath)

和源文件：

// cswlogger.h
#pragma once
#include <boost/log/sources/severity_logger.hpp>
#include <boost/log/attributes/mutable_constant.hpp>
#include <boost/log/utility/setup/common_attributes.hpp>
#include <boost/log/trivial.hpp>
#include <boost/log/sources/global_logger_storage.hpp>
#include <boost/log/sources/severity_logger.hpp>
#include <boost/log/utility/manipulators/add_value.hpp>


BOOST_LOG_GLOBAL_LOGGER(sysLogger,
boost::log::sources::severity_logger_mt<boost::log::trivial::severity_level>);


class CswLogger 
{
public:
    /// Init with default info level logging
    static void init(boost::log::trivial::severity_level level = boost::log::trivial::info);

    /// Disable logging
    static void disable();
};

#define LOG_LOG_LOCATION(LOGGER, LEVEL, ARG)            \
  BOOST_LOG_SEV(LOGGER, boost::log::trivial::LEVEL)     \
    << boost::log::add_value("Line", __LINE__)          \
    << boost::log::add_value("File", __FILE__) << ARG


/// System Log macros.
/// TRACE < DEBUG < INFO < WARN < ERROR < FATAL
#define LOG_TRACE(ARG) LOG_LOG_LOCATION(sysLogger::get(), trace, ARG);
#define LOG_DEBUG(ARG) LOG_LOG_LOCATION(sysLogger::get(), debug, ARG);
#define LOG_INFO(ARG)  LOG_LOG_LOCATION(sysLogger::get(), info, ARG);
#define LOG_WARN(ARG)  LOG_LOG_LOCATION(sysLogger::get(), warning, ARG);
#define LOG_ERROR(ARG) LOG_LOG_LOCATION(sysLogger::get(), error, ARG);
#define LOG_FATAL(ARG) LOG_LOG_LOCATION(sysLogger::get(), fatal, ARG);

main.cpp

//  cswlogger.cpp

#include "cswlogger.h"

#include <boost/log/core.hpp>
#include <boost/log/common.hpp>
#include <boost/log/attributes.hpp>
#include <boost/log/utility/setup/console.hpp>
#include <boost/log/utility/setup/common_attributes.hpp>
#include <boost/log/utility/setup/settings.hpp>
#include <boost/log/sinks/sync_frontend.hpp>

BOOST_LOG_GLOBAL_LOGGER_DEFAULT(sysLogger,
    boost::log::sources::severity_channel_logger_mt<boost::log::trivial::severity_level>);


void CswLogger::init(boost::log::trivial::severity_level level) 
{
    boost::log::add_console_log
    (
        std::clog,
        boost::log::keywords::format = "[%TimeStamp%] [%Severity%] [%File%(%Line%)] %Message%"
    );

    boost::log::core::get()->set_filter
    (
        boost::log::trivial::severity >= level
    );

    // Indicate start of logging
    LOG_INFO("Log Start");
}

void CswLogger::disable() 
{
    boost::log::core::get()->set_logging_enabled(false);
}

其输出将是：“ [] [] main.cpp（3）这是一条信息跟踪”

缺少时间戳和严重性参数。是否可以使用“ BOOST_LOG_SEV”日志宏并添加自定义日志参数，还是需要使用其他方法？

Answer 1

首先，输出中缺少TimeStamp属性，因为您尚未将其添加到日志记录核心。您可以按照here的说明添加它：

boost::log::core::get()->add_global_attribute(
    "TimeStamp",
    boost::log::attributes::local_clock());

或者您可以通过调用add_common_attributes将其添加为常用属性之一。

接下来，Severity属性存在，由记录器提供。但是，默认情况下，从字符串解析的过滤器和格式化程序不支持该属性的值类型（即boost::log::trivial::severity_level）。您可以通过两种方式解决此问题。

首先，您可以切换到日志接收器的手动设置，这将允许您将接收器的过滤器和格式化程序设置为lambda表达式。这样，您将能够向格式化程序提供属性类型。例如：

BOOST_LOG_ATTRIBUTE_KEYWORD(a_timestamp, "TimeStamp", boost::log::attributes::local_clock::value_type)
BOOST_LOG_ATTRIBUTE_KEYWORD(a_severity, "Severity", boost::log::trivial::severity_level)
BOOST_LOG_ATTRIBUTE_KEYWORD(a_file, "File", std::string)
BOOST_LOG_ATTRIBUTE_KEYWORD(a_line, "Line", int)

typedef boost::log::sinks::synchronous_sink< boost::log::sinks::text_ostream_backend > sink_t;
auto sink = boost::make_shared< sink_t >();
sink->set_formatter(boost::log::expressions::ostream
    << "[" << a_timestamp << "] "
    << "[" << a_severity << "] "
    << "[" << a_file << "(" << a_line << ")] "
    << boost::log::expressions::message);

boost::log::core::get()->add_sink(sink);

或者，您可以为Severity属性注册格式化程序和过滤器工厂，以便格式化程序和过滤器解析器能够将该属性与boost::log::trivial::severity_level类型相关联。 here对此进行了详细说明。就您而言，您可以在解析所有格式器之前（即在add_console_log调用之前）添加此调用：

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

使用自定义属性增强BOOST_LOG_SEV

1 个答案: