TCP断线重连

.h文件

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QTcpSocket>
#include <QTimer>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    void on_pushButton_clicked();

    void on_pushButton_2_clicked();

    void getData();

    void reConnectTCP();

    void on_pushButton_3_clicked();

private:
    Ui::MainWindow *ui;
    QTcpSocket *socket;
    QTimer *timer;
    QString ip;
    quint16 port;
};

#endif // MAINWINDOW_H

.cpp文件

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    socket = new QTcpSocket;
    QObject::connect(socket, SIGNAL(readyRead()), this, SLOT(getData()));
    timer = new QTimer;    // 开启定时器
    QObject::connect(timer, SIGNAL(timeout()), this, SLOT(reConnectTCP()));
    timer->start(10000);
}

MainWindow::~MainWindow()
{
    delete ui;
    delete socket;
    socket = nullptr;
}

// 连接TCP服务器
void MainWindow::on_pushButton_clicked()
{
    ip = ui->lineEdit->text();
    port = ui->lineEdit_2->text().toUInt();
    socket->connectToHost(ip, port);
}

// 断开连接
void MainWindow::on_pushButton_2_clicked()
{
    socket->close();
    delete socket;
    socket = nullptr;
    qDebug() << "连接已断开";
}

// 获取数据
void MainWindow::getData()
{
    QByteArray data = socket->readAll();
    ui->textEdit->append(data);
}

// 重连服务器
void MainWindow::reConnectTCP()
{
    if(!socket){
        qDebug() << "已重新连接";
        socket = new QTcpSocket;
        socket->connectToHost(ip, port);
        QObject::connect(socket, SIGNAL(readyRead()), this, SLOT(getData()));
    }
}

// 发送数据
void MainWindow::on_pushButton_3_clicked()
{
    QString str = ui->textEdit_2->toPlainText();
    qDebug() << str;
    socket->write(str.toUtf8());
}

.ui文件