一、方法一
#include <QCoreApplication> #include <QMutex> #include <QFile> #include <QDateTime> #include <QTextStream> #include <loghandle.h> #include <QDebug> void outputMessage(QtMsgType type, const QMessageLogContext &context, const QString &msg){ static QMutex mutex; mutex.lock(); 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: break; } QString context_info = QString("QFile:(%1) Line:(%2)").arg(QString(context.file)).arg(context.line); QString current_dateTime = QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss ddd"); QString current_data = QString("(%1)").arg(current_dateTime); QString message = QString("%1 %2 %3 %4").arg(text).arg(context_info).arg(msg).arg(current_data); QFile file("log.txt"); file.open(QIODevice::WriteOnly | QIODevice::Append); QTextStream text_stream(&file); text_stream << message << "\r\n"; file.flush(); file.close(); mutex.unlock(); } void space_line(){ // qDebug() << "==========================="; } int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); qInstallMessageHandler(outputMessage); atexit(space_line); qDebug() << "hello qt!"; return a.exec(); }
方法二、
以类的形式。
.h文件
#ifndef LOGHANDLE_H #define LOGHANDLE_H #include <QObject> #include <QMutex> #include <QTextStream> #include <QFile> #include <QDateTime> #include <QTimer> #include <QDir> static QMutex mutex; class LogHandle :public QObject { Q_OBJECT public: LogHandle(); ~LogHandle(); void checkLogFilesSize(); // 检查日志文件的大小 private slots: void autoDeleteLog(); // 自动删除日志 private: QTimer *timer = nullptr; }; #endif // LOGHANDLE_H
.cpp文件
#include "loghandle.h" #include <QDebug> void myMessageOutput(QtMsgType type, const QMessageLogContext &context, const QString &msg) { mutex.lock(); 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: break; } QString context_info = QString("QFile:(%1) Line:(%2)").arg(QString(context.file)).arg(context.line); QString current_dateTime = QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss ddd"); QString current_data = QString("(%1)").arg(current_dateTime); QString message = QString("%1 %2 %3 %4").arg(text).arg(context_info).arg(msg).arg(current_data); QFile file("today.txt"); file.open(QIODevice::WriteOnly | QIODevice::Append); QTextStream text_stream(&file); text_stream << message << "\r\n"; file.flush(); file.close(); mutex.unlock(); } LogHandle::LogHandle() { qInstallMessageHandler(myMessageOutput); timer = new QTimer; QObject::connect(timer, SIGNAL(timeout()), this, SLOT(autoDeleteLog())); timer->start(5000); } LogHandle::~LogHandle() { } void LogHandle::autoDeleteLog() { // QDateTime now = QDateTime::currentDateTime(); // QDateTime time1 = now.addDays(-30); // QDateTime time2; // QDir dir("taday.txt"); // QFileInfoList fileList = dir.entryInfoList(); // foreach (QFileInfo f, fileList ) { // // "."和".."跳过 // if (f.baseName() == "") // continue; // time2 = QDateTime::fromString(f.baseName(), "yyyy-MM-dd"); // if (time2 < time1) { // 只要日志时间小于前30天的时间就删除 // dir.remove(f.absoluteFilePath()); // } // } } void LogHandle::checkLogFilesSize() { qDebug() << "wadakjfaskd"; }
.main文件
#include <QCoreApplication> #include <QMutex> #include <QFile> #include <QDateTime> #include <QTextStream> #include <loghandle.h> #include <QDebug> int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); LogHandle log; qDebug() << "hello qt!"; log.checkLogFilesSize(); return a.exec(); }