Qt实现记录日志文件log

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Qt实现记录日志文件log

2023-08-14 08:09| 来源: 网络整理| 查看: 265

概述

Qt有两种实现记录日志的方式，第一种是安装自定义的Qt消息处理程序，自动输出程序产生的调试消息、警告、关键和致命错误消息的函数；第二种是自定义一个类，可以在程序指定位置打印输出指定的内容。

第一种qInstallMessageHandler方式

自定义消息处理函数，然后安装该函数，注意此时QDebug的消息将会输出在日志文件，Qt程序调式时不再打印。 main.cpp

#include "widget.h" #include #include #include #include #include #include void outputMessage(QtMsgType type,const QMessageLogContext &context,const QString &msg); int main(int argc, char *argv[]) { qInstallMessageHandler(outputMessage);//安装消息处理程序 QApplication a(argc, argv); Widget w; w.show(); return a.exec(); } void outputMessage(QtMsgType type,const QMessageLogContext &context,const QString &msg) { static QMutex mutex; mutex.lock(); QByteArray localMsg = msg.toLocal8Bit(); QString text; switch (type) { case QtDebugMsg: text = QString("Debug:"); break; case QtWarningMsg: text = QString("Warning:"); break; case QtCriticalMsg: text = QString("Critical:"); break; case QtFatalMsg: text = QString("Fatal:"); break; default: text = QString("Debug:"); } // 设置输出信息格式 QString context_info = QString("File:(%1) Line:(%2)").arg(QString(context.file)).arg(context.line); // F文件L行数 QString strDateTime = QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss"); //QString strMessage = QString("%1 %2 \t%3 \t%4").arg(text).arg(context_info).arg(strDateTime).arg(msg); QString strMessage = QString("%1 \t%2 \t%3").arg(text).arg(strDateTime).arg(msg); // 输出信息至文件中（读写、追加形式） QFile file(QString(QDateTime::currentDateTime().toString("yyyy-MM-dd").append("-log.txt"))); file.open(QIODevice::ReadWrite | QIODevice::Append); QTextStream stream(&file); stream RINFO, /*!< 提示 */ RWARNING, /*!< 警告 */ RERROR /*!< 错误 */ }; Q_FLAG(CLOG_LEVEL) struct LogConfig { bool isRecord2File; /*!< 是否记录到文件 */ int level; /*!< 记录日志等级，大于等于此level的日志将被记录 */ }; CLog(); void setLogLevel(const CLog::CLOG_LEVEL & level); CLog::CLOG_LEVEL getLogLevel(){return logLevel;} static bool init(CLog::LogConfig & logConfig); static bool createDir(QString dirPath); static void log(CLOG_LEVEL nLevel,const char * fileDesc,const char * functionDesc, int lineNum,const char* data, ...); private: static QString getLeveDesc(CLOG_LEVEL level); private: static bool isRecord2File; static bool isFileReady; static CLOG_LEVEL logLevel; }; #ifdef Q_OS_WIN #define FILE_SEPARATOR '\\' #else #define FILE_SEPARATOR '/' #endif #define FUNC_SEPARATOR '::' #ifndef QT_NO_DEBUG #define __FILENAME__ (strrchr(__FILE__, FILE_SEPARATOR) ? (strrchr(__FILE__, FILE_SEPARATOR) + 1):__FILE__) #define __FUNNAME__ (strrchr(__FUNCTION__,FUNC_SEPARATOR)?(strrchr(__FUNCTION__, FUNC_SEPARATOR) + 1):__FUNCTION__) #else #define __FILENAME__ NULL #define __FUNNAME__ NULL #endif #define CLOG_INFO(...) CLog::log(CLog::RINFO,__FILENAME__,__FUNNAME__,__LINE__, __VA_ARGS__) #define CLOG_WARNING(...) CLog::log(CLog::RWARNING, __FILENAME__,__FUNNAME__, __LINE__,__VA_ARGS__) #define CLOG_ERROR(...) CLog::log(CLog::RERROR,__FILENAME__,__FUNNAME__,__LINE__,__VA_ARGS__) #endif // CLOG_H

clog.cpp

#include "clog.h" #include #include #include #include #include #include #include #include #include const char PATH_LogPath[] = "/../logs"; const char Suffix[] = ".log"; #define MAX_LOG_LENGH 1024 bool CLog::isFileReady = false; bool CLog::isRecord2File = true; CLog::CLOG_LEVEL CLog::logLevel = CLog::RINFO; //默认是info级 QFile localFile; QMutex mutex; CLog::CLog() { } void CLog::setLogLevel(const CLog::CLOG_LEVEL &level) { logLevel = level; } bool CLog::init(LogConfig &logConfig) { isRecord2File = logConfig.isRecord2File; logLevel = (CLog::CLOG_LEVEL)logConfig.level; QString logDir = qApp->applicationDirPath() + QString(PATH_LogPath); if(createDir(logDir)) { QString fileName = logDir + QDir::separator() + QDate::currentDate().toString("yyyy-MM-dd") + QString(Suffix); localFile.setFileName(fileName); if(localFile.open(QFile::WriteOnly|QFile::Append|QFile::Text)) { isFileReady = true; } } return isFileReady; } bool CLog::createDir(QString dirPath) { QFileInfo fileInfo(dirPath); if(!fileInfo.exists()) { QDir tmpDir; return tmpDir.mkpath(dirPath); } return true; } void CLog::log(CLOG_LEVEL nLevel, const char *fileDesc, const char *functionDesc, int lineNum, const char* data, ...) { QMutexLocker locker(&mutex); if(isFileReady && nLevel >= logLevel) { QString recordInfo = QString("[%1]").arg(QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss:zzz")); recordInfo.append(getLeveDesc(nLevel)); #ifndef QT_NO_DEBUG recordInfo.append(QString("[%1:%2:%3]").arg(fileDesc).arg(functionDesc).arg(lineNum)); #endif va_list vlist; va_start(vlist,data); QByteArray byteArray; #if defined(Q_OS_WIN) int recordLen = _vscprintf(data,vlist); byteArray.resize(recordLen); #else byteArray.resize(1024); #endif vsprintf(byteArray.data(),data,vlist); recordInfo.append(byteArray); va_end(vlist); recordInfo.append("\n"); if(isRecord2File){ localFile.write(recordInfo.toLocal8Bit().data(),recordInfo.toLocal8Bit().length()); localFile.flush(); }else{ // qDebug() case CLOG_LEVEL::INFO: return "[INFO]"; case CLOG_LEVEL::INFO: return "[WARNING]"; case CLOG_LEVEL::INFO: return "[ERROR]"; } #endif }

简单调用示例：

CLog::LogConfig logConfig; logConfig.isRecord2File = true; logConfig.level = 0; CLog::init(logConfig); CLOG_INFO("df2008");

输出日志： [2020-12-03 13:15:14:549][RINFO][widget.cpp:Widget:17]df2008

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Qt实现记录日志文件log

Qt实现记录日志文件log

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