QT日志系统

今天给大家介绍下QT里面的日志系统，直接上代码

#include <QApplication>
#include <iostream>
#include "ThorHardwareUtil/PLC/plc.h"
#include "ThorHardwareUtil/crc.h"
#include "ThorHardwareUtil/Warehouse/baseshelf.h"
#include <QDebug>
#include "opendoorthread.h"
#include "TestProject/testform.h"
#include <QtMessageHandler>
#include <QFile>
#include <QDir>
#include <ThorUtil/confighelper.h>
#include <thread>
using namespace std;
//写入信息到文件
void WriteLog(QString str, QString LogType)
{

    QString fileFolder= qApp->applicationDirPath()+"/log/"+QDateTime::currentDateTime().toString("yyyy-MM-dd");
    QDir dir(fileFolder);
    if(!dir.exists())
    {
        dir.mkpath(fileFolder);
    }
    QString filePath=QString("%1/%2.log").arg(fileFolder).arg(LogType);
    QString strToWrite="日志产生时间："+QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss");
    strToWrite.append(QString("
日志消息：%1").arg(str));
    strToWrite.append("
---------------------------------------------------------------------");
    QFile file(filePath);
    file.open(QIODevice::WriteOnly | QIODevice::Append);
    QTextStream text_stream(&file);
    text_stream <<strToWrite<<"
";
    file.flush();
    file.close();
    //打印到控制台
    std::cout << strToWrite.toLocal8Bit().constData() << std::endl;
}
//注册函数
void myMessageOutput(QtMsgType type, const QMessageLogContext &context, const QString &msg)
{
    QString txtMessage = "";
    QString messageType = "";
    switch (type)    {
    case QtDebugMsg:    //调试信息提示
        messageType = "Debug";
        txtMessage = QString("Debug: %1 (%2:%3, %4)
").arg(msg).arg(context.file).arg(QString::number(context.line)).arg(context.function);
        break;
    case QtInfoMsg:
        messageType = "Info";
        txtMessage = QString("Warning: %1 (%2:%3, %4)
").arg(msg).arg(context.file).arg(QString::number(context.line)).arg(context.function);
        break;
    case QtWarningMsg:    //一般的warning提示
        messageType = "Waring";
        txtMessage = QString("Warning: %1 (%2:%3, %4)
").arg(msg).arg(context.file).arg(QString::number(context.line)).arg(context.function);
        break;
    case QtCriticalMsg:    //严重错误提示
        messageType = "Critical";
        txtMessage = QString("Critical: %1 (%2:%3, %4)
").arg(msg).arg(context.file).arg(QString::number(context.line)).arg(context.function);
        PostErrorMessage(txtMessage,messageType);
        break;
    case QtFatalMsg:    //致命错误提示
        messageType = "Fatal";
        txtMessage = QString("Fatal: %1 (%2:%3, %4)
").arg(msg).arg(context.file).arg(QString::number(context.line)).arg(context.function);
        abort();
    }
    WriteLog(txtMessage, messageType);
}
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    //注册监听级别函数
    qInstallMessageHandler(myMessageOutput);
    
     qDebug() << "debug";


    return a.exec();
}

这样大家使用qDebug，qInfo，qCritical等打印信息就会分类输出到日志文件里面，方便查看

注意：release模式下无法打印QMessageLogContext的具体内容，因为qt默认把release给取消了，需要在pro文件里面加上DEFINES += QT_MESSAGELOGCONTEXT