使用Boost库Log模块实现的C++日志类
概述
Boost库的Log模块用于实现日志，虽然功能强大，但比较复杂，学习起来比较费时。
为此，我将其进行了封装成日志类，以方便日后使用。
该日志类具有多线程安全、可以使用中文字符等优点。
类头文件
#pragma once#include <string>#include <boost/log/sources/severity_logger.hpp>#include <boost/log/attributes.hpp>#include <boost/log/attributes/scoped_attribute.hpp>#include <boost/log/trivial.hpp>class Log{public:Log(const std::string &sLogFilePfx = "Log", const unsigned int nRotSize = 5 * 1024 * 1024);~Log();void fatalLog(const std::wstring & wsTxt);void errorLog(const std::wstring & wsTxt);void warningLog(const std::wstring & wsTxt);void infoLog(const std::wstring & wsTxt);void debugLog(const std::wstring & wsTxt);void traceLog(const std::wstring & wsTxt);#define M_LOG_USE_TIME_LINE BOOST_LOG_SCOPED_THREAD_ATTR("Timeline", boost::log::attributes::timer());#define M_LOG_USE_NAMED_SCOPE(named_scope) BOOST_LOG_NAMED_SCOPE(named_scope);private:void internLog(const std::wstring & wsTxt, const boost::log::trivial::severity_level eSevLev);boost::log::sources::wseverity_logger_mt<boost::log::trivial::severity_level> m_oWsLogger;};
类实现文件
namespace logging = boost::log;namespace src = boost::log::sources;namespace expr = boost::log::expressions;namespace sinks = boost::log::sinks;namespace attrs = boost::log::attributes;namespace keywords = boost::log::keywords;using std::string;BOOST_LOG_ATTRIBUTE_KEYWORD(tag_attr, "Tag", std::string)BOOST_LOG_ATTRIBUTE_KEYWORD(scope, "Scope", attrs::named_scope::value_type)BOOST_LOG_ATTRIBUTE_KEYWORD(timeline, "Timeline", attrs::timer::value_type)BOOST_LOG_ATTRIBUTE_KEYWORD(thread_id, "ThreadID", attrs::current_thread_id::value_type)Log::Log(const string &sLogFilePfx, const unsigned int nRotSizeInByte){if (sLogFilePfx.empty()){throw new std::invalid_argument("日志文件前缀为空");}if (0 == nRotSizeInByte){throw new std::invalid_argument("日志文件旋转大小为0");}typedef sinks::synchronous_sink< sinks::text_file_backend > text_sink;boost::shared_ptr< sinks::text_file_backend > backend = boost::make_shared< sinks::text_file_backend >(keywords::file_name = sLogFilePfx + "_%N.log", keywords::rotation_size = nRotSizeInByte,keywords::open_mode = std::ios_base::app);boost::shared_ptr< text_sink > sink(new text_sink(backend));sink->set_formatter(expr::stream<< expr::format_date_time< boost::posix_time::ptime >("TimeStamp", "%Y-%m-%d %H:%M:%S") << " | "<< logging::trivial::severity << "\t| "<< thread_id << " | "<< "(" << scope << ") "<< expr::if_(expr::has_attr(tag_attr))[expr::stream << "[" << tag_attr << "] "]<< expr::if_(expr::has_attr(timeline))[expr::stream << "[" << timeline << "] "]<< expr::message);std::locale loc = boost::locale::generator()("en_US.UTF-8");sink->imbue(loc);logging::core::get()->add_sink(sink);logging::add_common_attributes();logging::core::get()->add_global_attribute("Scope", attrs::named_scope());}Log::~Log(){}void Log::fatalLog(const std::wstring & wsTxt){if (wsTxt.empty()){return;}internLog(wsTxt, logging::trivial::fatal);}void Log::errorLog(const std::wstring & wsTxt){if (wsTxt.empty()){return;}internLog(wsTxt, logging::trivial::error);}void Log::warningLog(const std::wstring & wsTxt){if (wsTxt.empty()){return;}internLog(wsTxt, logging::trivial::warning);}void Log::infoLog(const std::wstring & wsTxt){if (wsTxt.empty()){return;}internLog(wsTxt, logging::trivial::info);}void Log::debugLog(const std::wstring & wsTxt){if (wsTxt.empty()){return;}internLog(wsTxt, logging::trivial::debug);}void Log::traceLog(const std::wstring & wsTxt){if (wsTxt.empty()){return;}internLog(wsTxt, logging::trivial::trace);}void Log::internLog(const std::wstring & wsTxt, const logging::trivial::severity_level eSevLev){if (wsTxt.empty()){return;}BOOST_LOG_SEV(m_oWsLogger, eSevLev) << wsTxt;}
测试代码
#include <future>#include <thread>#include "Log.h"void useTimeLine(Log &oLog){M_LOG_USE_TIME_LINE;oLog.infoLog(L"Time line 1");oLog.infoLog(L"Time line 2");}void named_scope_logging(Log &oLog){M_LOG_USE_NAMED_SCOPE("named_scope_logging");oLog.infoLog(L"Hello from the function named_scope_logging!");}int main(int, char*[]){Log oLog;auto result1 = std::async([&] {for (size_t i = 0; i < 10; i++){oLog.infoLog(L"async fun");}});oLog.infoLog(L"info log");useTimeLine(oLog);oLog.infoLog(L"info log1");named_scope_logging(oLog);oLog.fatalLog(L"致命错误日志");oLog.errorLog(L"错误日志");oLog.warningLog(L"警告日志");oLog.infoLog(L"信息日志");oLog.debugLog(L"调试日志");oLog.traceLog(L"跟踪日志");result1.get();return 0;}
测试结果
2019-10-07 12:54:16 | info | 0x000017bc | () async fun
2019-10-07 12:54:16 | info | 0x000017bc | () async fun
2019-10-07 12:54:16 | info | 0x000017bc | () async fun
2019-10-07 12:54:16 | info | 0x000017bc | () async fun
2019-10-07 12:54:16 | info | 0x000017bc | () async fun
2019-10-07 12:54:16 | info | 0x000017bc | () async fun
2019-10-07 12:54:16 | info | 0x000017bc | () async fun
2019-10-07 12:54:16 | info | 0x00001c90 | () info log
2019-10-07 12:54:16 | info | 0x000017bc | () async fun
2019-10-07 12:54:16 | info | 0x00001c90 | () [00:00:00.000063] Time line 1
2019-10-07 12:54:16 | info | 0x000017bc | () async fun
2019-10-07 12:54:16 | info | 0x000017bc | () async fun
2019-10-07 12:54:16 | info | 0x00001c90 | () [00:00:00.002959] Time line 2
2019-10-07 12:54:16 | info | 0x00001c90 | () info log1
2019-10-07 12:54:16 | info | 0x00001c90 | (named_scope_logging) Hello from the function named_scope_logging!
2019-10-07 12:54:16 | fatal | 0x00001c90 | () 致命错误日志
2019-10-07 12:54:16 | error | 0x00001c90 | () 错误日志
2019-10-07 12:54:16 | warning | 0x00001c90 | () 警告日志
2019-10-07 12:54:16 | info | 0x00001c90 | () 信息日志
2019-10-07 12:54:16 | debug | 0x00001c90 | () 调试日志
2019-10-07 12:54:16 | trace | 0x00001c90 | () 跟踪日志
其他
Nuget安装Boost库Log模块命令
Install-package boost -version 1.68.0Install-package boost_atomic-vc141 -version 1.68.0Install-package boost_chrono-vc141 -version 1.68.0Install-package boost_date_time-vc141 -version 1.68.0Install-package boost_filesystem-vc141 -version 1.68.0Install-package boost_log_setup-vc141 -version 1.68.0Install-package boost_log-vc141 -version 1.68.0Install-package boost_system-vc141 -version 1.68.0Install-package boost_thread-vc141 -version 1.68.0Install-package boost_locale-vc141 -version 1.68.0
转自：https://blog.csdn.net/xuyouqiang1987/article/details/102300043
