【Qt】qDebug()调试信息保存至txt日志文件

#include <QApplication>
#include <iostream>
#include <cstdlib>
#include <QFile>
#include <QString>
#include <QTextStream>
#include <QMutex>
#include <QDateTime>
using namespace std;QMutex mutex;//日志代码互斥锁
QString timePoint;//日志生成
void LogMsgOutput(QtMsgType type, const QMessageLogContext &context, const QString &msg){	 mutex.lock();cout << msg.toStdString() << endl;//Critical Resource of CodeQByteArray localMsg = msg.toLocal8Bit();QString log;switch (type) {case QtDebugMsg://fprintf(stderr, "Debug: %s (%s:%u, %s)\n", localMsg.constData(), context.file, context.line, context.function);log.append(QString("Debug  File:%1 %2  Line:%3  Content:%4").arg(context.file).arg(context.function).arg(context.line).arg(msg));break;case QtInfoMsg://fprintf(stderr, "Info: %s (%s:%u, %s)\n", localMsg.constData(), context.file, context.line, context.function);log.append(QString("Info: %1  %2  %3  %4").arg(localMsg.constData()).arg(context.file).arg(context.line).arg(context.function));break;case QtWarningMsg://fprintf(stderr, "Warning: %s (%s:%u, %s)\n", localMsg.constData(), context.file, context.line, context.function);log.append(QString("Warning: %1  %2  %3  %4").arg(localMsg.constData()).arg(context.file).arg(context.line).arg(context.function));break;case QtCriticalMsg://fprintf(stderr, "Critical: %s (%s:%u, %s)\n", localMsg.constData(), context.file, context.line, context.function);log.append(QString("Critical: %1  %2  %3  %4").arg(localMsg.constData()).arg(context.file).arg(context.line).arg(context.function));break;case QtFatalMsg://fprintf(stderr, "Fatal: %s (%s:%u, %s)\n", localMsg.constData(), context.file, context.line, context.function);log.append(QString("Fatal: %1  %2  %3  %4").arg(localMsg.constData()).arg(context.file).arg(context.line).arg(context.function));abort();}QFile file;QString path = QString("log%1.lgt").arg(timePoint);file.setFileName(path);if (!file.open(QIODevice::ReadWrite | QIODevice::Append)){QString erinfo = file.errorString();cout << erinfo.toStdString() << endl;return;}QTextStream out(&file);out << "\n\r" << log;file.close();mutex.unlock();}int main(int argc, char *argv[])
{//release模式下，调试信息输出至日志文件
#ifndef _DEBUGtimePoint = QDateTime::currentDateTime().toString("yyyyMMddHHmmss");qInstallMessageHandler(LogMsgOutput);
#endifQApplication a(argc, argv);Widget w;w.show();return a.exec();
}