Qt 利用线程每秒获取网页数据并保存

所需模块

QT += core gui
QT += axcontainer
QT += network

头文件

#include
<QObject>
#include <QtNetwork/QNetworkAccessManager>
#include <QtNetwork/QNetworkRequest>
#include <QtNetwork/QNetworkReply>
#include <QThread>
#include <QUrl>
#include <QMainWindow>
#include <QString>
#include <QDebug>
#include <QFile>
#include <QPushButton>

创建线程

新建MyThread.h

#include <QObject>
class MyThread : public QObject
{
Q_OBJECT
public:
explicit MyThread(QObject *parent = nullptr);
void myTimeout();
void setFlag(bool flag = true);
signals:
void mySignal();
public slots:
private:
bool isStop;
};

在生成的MyThread.cpp中添加线程响应

#include "mythread.h"
#include <QThread>
#include<QDebug>
MyThread::MyThread(QObject *parent) : QObject(parent)
{
isStop = false;
}
void MyThread::myTimeout()
{
while(isStop == false)
{
QThread::sleep(3);//强制暂停3秒，使得每三秒产生一次信号，
emit mySignal();//每3秒发送一次信号给mainwindow.cpp
qDebug()<<"子线程号"<<QThread::currentThread();
}
}
void MyThread::setFlag(bool flag)
{
isStop = flag;//定义标志位用于判断线程是否终止
}

在mainwindows.h中添加相应函数

class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
void dealSignal();//处理子线程响应函数，
void dealClose();//关闭线程响应
signals:
void startThread();//开启线程信号
private slots:
void finishedSlot();
private:
Ui::MainWindow *ui;
QPushButton pushButton_StartReading;
MyThread *myT;
QThread *thread;
QNetworkAccessManager *m_NetManger;
QNetworkReply *m_Reply;
};

在.cpp文件中进行各个函数的攥写

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QThread>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
//代码生成一个按钮,用于网络数据读取的触发方式
pushButton_StartReading.setParent(this);
pushButton_StartReading.setText("startReading");
pushButton_StartReading.move(45,90);
pushButton_StartReading.setMaximumSize(100,30);
connect(&pushButton_StartReading,&QPushButton::pressed,this,&MainWindow::on_pushButton_StartReading);
//网络获取数据部分
myT = new MyThread;
thread = new QThread(this);
myT->moveToThread(thread);
connect(myT, &MyThread::mySignal, this, &MainWindow::dealSignal);
qDebug()<<"主线程号"<<QThread::currentThread();
//
connect(this, &MainWindow::startThread,myT, &MyThread::myTimeout);
//当窗口销毁时，关闭线程
connect(this,&MainWindow::destroyed, this, &MainWindow::dealClose);
}
MainWindow::~MainWindow()
{
delete ui;
}
//网络信号响应
void MainWindow::dealSignal()
{
m_NetManger = new QNetworkAccessManager;
QUrl url(https://www.bilibili.com/);
m_Reply = m_NetManger->get(QNetworkRequest(url));
connect(m_Reply,SIGNAL(readyRead()),this,SLOT(finishedSlot()));
}
//网络信号结束响应
void MainWindow::dealClose()
{
if(thread->isRunning() == false)//判断线程是否终止
{
return;
}
myT->setFlag(true);
thread->quit();
thread->wait();//将等待线程完成本次响应操作后终止
delete myT;
}
void MainWindow::on_pushButton_StartReading()
{
if(thread->isRunning() == true)//判断此时线程是否正在运行，运行中则无视点击
{
return ;
}
thread->start();
myT->setFlag(false);
emit startThread();//启动线程
}
void MainWindow::finishedSlot()
{
m_Reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);
m_Reply->attribute(QNetworkRequest::RedirectionTargetAttribute);
//ui->textBrowser->setText(string);可以添加ui控件观察内容
if(m_Reply->error() == QNetworkReply::NoError)
{
QByteArray bytes = m_Reply->readAll();
QString string =QString::fromUtf8(bytes);
// QRegularExpression re(R"({[sS]*]})");//正则表达式，用于取出合适数据
//QRegularExpressionMatch match = re.match(string);
//string = match.captured();
QFile file(../1.txt);//将网页内容保存为1.txt,保存在上层目录中
file.open(QIODevice::WriteOnly|QIODevice::Truncate);
QTextStream out(&file);
out.setCodec("UTF-8");
out<<string<<endl;
file.close();
}
else
{
qDebug()<<m_Reply->errorString();
}
m_Reply->deleteLater();
}
//可以通过ui控件添加pushButton_Stop按钮，建立槽函数触发dealclose（）
void MainWindow::on_pushButton_Stop_clicked()
{
dealClose();
}

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