QT5生成log日志

函数说明：生成log日志。

调用方法：qInstallMessageHandler(outputMessage);

使用qDebug()<<"q"<<endl;

就可以在log.txt文件中查看所打印的信息。

#ifndef _LOGRECORD_H
#define _LOGRECORD_H
#pragma execution_character_set("utf-8")
#include <QObject>
#include <QMutex>
#include <QDateTime>
#include <QFile>
#include <QTextStream>
void outputMessage(QtMsgType type, const QMessageLogContext &context, const QString &msg);

#endif // !_LOGRECORD_H

#include "LogRecord.h"
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 ");
}

QString context_info = QString("File:(%1) Line :(%2)").arg(QString(context.file)).arg(context.line);
QString current_date_time = QDateTime::currentDateTime().toString("yyyy - MM - dd hh : mm:ss ddd");
QString current_date = QString("(%1)").arg(current_date_time);
QString message = QString("%1%2%3%4").arg(text).arg(context_info).arg(msg).arg(current_date);

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();
}