我需要一个Boost记录器,它可以记录到控制台(稍后记录到文件(,并具有以下参数:"[%TimeStamp%][%Serity%][%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",但我真的无法让它发挥作用。
// 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);
和源文件:
// 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);
}
main.cpp
#include "cswlogger.h"
CswLogger::init();
LOG_INFO("This is a info trace");
其输出为:"[][]main.cpp(3(this is a info trace">
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?
首先,输出中缺少TimeStamp
属性,因为您尚未将其添加到日志核心中。您可以按此处所述添加:
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
属性出现,它由记录器提供。但是,默认情况下,从字符串解析的筛选器和格式化程序不支持该属性的值类型(即boost::log::trivial::severity_level
(。你可以用两种方法来解决这个问题。
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筛选器和格式化程序设置为lambda表达式。通过这种方式,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筛选器工厂,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。这里将对此进行详细描述。在您的情况下,您可以在解析任何格式化程序之前(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");