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免费b站推广网站动漫,b站推广网站2024mmm,psd做模板下载网站,多用户商城系统的优势版本 spdlog版本：1.5.0 采用1.5.0版本主要基于以下考虑：兼容Qt5.9.X版本和兼容C11。 spdlog 1.5.0下载地址：https://github.com/gabime/spdlog/releases/tag/v1.5.0 摘要在Qt应用程序开发中，良好的日志系统至关重要。本文将介…

版本

spdlog版本：1.5.0

采用1.5.0版本主要基于以下考虑：兼容Qt5.9.X版本和兼容C++11。

spdlog 1.5.0下载地址：https://github.com/gabime/spdlog/releases/tag/v1.5.0

摘要

在Qt应用程序开发中，良好的日志系统至关重要。本文将介绍如何使用spdlog 1.5.0创建满足以下要求的日志系统：

自定义文件名格式：yyyyMMdd_hhmmss_毫秒.log，不使用spdlog提供的日志轮转功能

spdlog::sinks::rotating_file_sink_mt，采用自定义custom_rotating_file_sink；
保留最近10个日志文件，每个日志文件大小限制为1MB。

例子

logmanager.h文件

#ifndef LOGMANAGER_H
#define LOGMANAGER_H#include <QObject>
#include <memory>
#include <spdlog/spdlog.h>class LogManager : public QObject
{Q_OBJECT
public:static LogManager& instance();void initialize(const QString& logDir = "logs",const QString& appName = "app",size_t maxFileSize = 1024 * 1024, // 1MBsize_t maxFiles = 10);void shutdown();template<typename... Args>static void log(spdlog::level::level_enum level, const QString& message, Args... args){if (instance().m_logger){instance().m_logger->log(level, message.toStdString().c_str(), args...);}}// 便捷方法static void trace(const QString& message){log(spdlog::level::trace, message);}static void debug(const QString& message){log(spdlog::level::debug, message);}static void info(const QString& message){log(spdlog::level::info, message);}static void warn(const QString& message){log(spdlog::level::warn, message);}static void error(const QString& message){log(spdlog::level::err, message);}static void critical(const QString& message){log(spdlog::level::critical, message);}private:LogManager(QObject* parent = nullptr);~LogManager();std::shared_ptr<spdlog::logger> createCustomLogger(const std::string& base_filename,size_t max_size,size_t max_files);std::shared_ptr<spdlog::logger> m_logger;std::atomic<bool> m_shuttingDown{false};signals:void aboutToShutdown();private slots:void onAboutToQuit();};// 日志宏定义
#define LOG_TRACE(...)    LogManager::log(spdlog::level::trace, __VA_ARGS__)
#define LOG_DEBUG(...)    LogManager::log(spdlog::level::debug, __VA_ARGS__)
#define LOG_INFO(...)     LogManager::log(spdlog::level::info, __VA_ARGS__)
#define LOG_WARN(...)     LogManager::log(spdlog::level::warn, __VA_ARGS__)
#define LOG_ERROR(...)    LogManager::log(spdlog::level::err, __VA_ARGS__)
#define LOG_CRITICAL(...) LogManager::log(spdlog::level::critical, __VA_ARGS__)#endif // LOGMANAGER_H

logmanager.cpp文件

#include "logmanager.h"
#include <spdlog/sinks/base_sink.h>
#include <spdlog/details/file_helper.h>
#include <mutex>
#include <chrono>
#include <iomanip>
#include <sstream>
#include <vector>
#include <algorithm>
#include <QDir>
#include <QFileInfo>
#include <QDateTime>
#include <QCoreApplication>
#include <csignal>
#include <QDebug>// 替换 std::filesystem 的 C++11 兼容实现
namespace spdlog
{class custom_rotating_file_sink : public spdlog::sinks::base_sink<std::mutex>{public:custom_rotating_file_sink(const std::string& base_filename,std::size_t max_size,std::size_t max_files): base_filename_(base_filename),max_size_(max_size),max_files_(max_files){file_helper_.open(gen_filename());}protected:void sink_it_(const spdlog::details::log_msg& msg) override{spdlog::memory_buf_t formatted;formatter_->format(msg, formatted);if (file_helper_.size() + formatted.size() > max_size_){rotate_();}file_helper_.write(formatted);}void flush_() override{file_helper_.flush();}private:std::string gen_filename(){QDateTime now = QDateTime::currentDateTime();QString timeStr = now.toString("yyyyMMddhhmmss");// 添加毫秒部分(3位)int ms = now.time().msec();timeStr += QString("_%1").arg(ms, 3, 10, QLatin1Char('0'));return base_filename_ + "_" + timeStr.toStdString() + ".log";}void rotate_(){file_helper_.close();cleanup_old_files();file_helper_.open(gen_filename());}void cleanup_old_files(){if (max_files_ == 0) return;QFileInfo base_info(QString::fromStdString(base_filename_));QDir dir = base_info.absoluteDir();QString base_name = base_info.fileName();QFileInfoList files = dir.entryInfoList(QStringList() << (base_name + "_*.log"),QDir::Files, QDir::Time);// 删除最旧的文件while (files.size() >= static_cast<int>(max_files_)){QFile::remove(files.last().absoluteFilePath());files.removeLast();}}std::string base_filename_;std::size_t max_size_;std::size_t max_files_;spdlog::details::file_helper file_helper_;};} // namespaceLogManager::LogManager(QObject* parent) : QObject(parent)
{// 连接Qt退出信号connect(qApp, &QCoreApplication::aboutToQuit, this, &LogManager::onAboutToQuit);// 处理异常信号static auto handleSignal = [](int){LogManager::instance().shutdown();std::_Exit(1);};std::signal(SIGTERM, handleSignal);std::signal(SIGSEGV, handleSignal);std::signal(SIGINT, handleSignal);std::signal(SIGABRT, handleSignal);
}LogManager::~LogManager()
{shutdown();
}LogManager& LogManager::instance()
{static LogManager instance;return instance;
}void LogManager::initialize(const QString& logDir, const QString& appName, size_t maxFileSize, size_t maxFiles)
{if (m_logger){return;}// 确保日志目录存在QDir().mkpath(logDir);std::string base_filename = QDir(logDir).absoluteFilePath(appName).toStdString();m_logger = createCustomLogger(base_filename, maxFileSize, maxFiles);// 设置默认日志格式m_logger->set_pattern("[%Y-%m-%d %H:%M:%S.%e] [%l] [thread %t] %v");m_logger->set_level(spdlog::level::trace);spdlog::register_logger(m_logger);spdlog::set_default_logger(m_logger);
}void LogManager::shutdown()
{/*if (m_logger){spdlog::drop(m_logger->name());m_logger.reset();}spdlog::shutdown();*/if (m_shuttingDown) return;m_shuttingDown = true;emit aboutToShutdown();try{if (m_logger){m_logger->flush();spdlog::drop(m_logger->name());}spdlog::shutdown();m_logger.reset();}catch (const spdlog::spdlog_ex& ex){qCritical() << "Log shutdown error:" << ex.what();}
}void LogManager::onAboutToQuit()
{shutdown();
}std::shared_ptr<spdlog::logger> LogManager::createCustomLogger(const std::string& base_filename,size_t max_size,size_t max_files)
{auto sink = std::make_shared<spdlog::custom_rotating_file_sink>(base_filename, max_size, max_files);auto logger = std::make_shared<spdlog::logger>("qt_logger", sink);return logger;
}

main.cpp文件

#include <QCoreApplication>
#include "logmanager.h"
#include <QTimer>
#include <QDebug>int main(int argc, char* argv[])
{QCoreApplication a(argc, argv);// 初始化日志系统LogManager::instance().initialize("logs", "MyAppTest");// 连接关闭信号进行额外清理QObject::connect(&LogManager::instance(), &LogManager::aboutToShutdown, [](){LOG_INFO("Performing final cleanup before shutdown...");});for (int i = 0; i < 5000; ++i){LOG_INFO("This is a test message to fill up the log file. Iteration: {}", i);}return a.exec();
}

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