[网络协议]QT QTcpServer

#ifndef TCP4WEB_H

#define TCP4WEB_H

#include <QObject>

#include <QTcpServer>

#include <QTcpSocket>

#include <QDebug>

class Tcp4Web : public QObject

{

    Q_OBJECT

public:

    explicit Tcp4Web(QObject *parent = 0);

    ~Tcp4Web();

signals:

    void dataArrive(QByteArray ba); //send data to deal

public slots:

    void onNewConnection(); //new connection come

    void socketReaddata();    //read socket data

    void socketDisconnect();

private:

    QTcpServer *m_tcpserver;

    QByteArray tmpdata;

    int tcpPort = 6000;

    QByteArray m_buffer;

    QHash<QString, QTcpSocket*>m_validClientList;// 有效列表<用户:密码，QTcpSocket* >

    QList<QTcpSocket*>m_allClinet;

};

#endif // TCP4WEB_H

#include "tcp4web.h"

Tcp4Web::Tcp4Web(QObject *parent) : QObject(parent)

{

    //m_thread = new QThread();

    m_tcpserver = new QTcpServer();

    connect(m_tcpserver, &QTcpServer::newConnection, this, &Tcp4Web::onNewConnection, Qt::DirectConnection);

    if (!m_tcpserver->listen(QHostAddress::AnyIPv4, 6000))

    {

            m_tcpserver->close();

            qDebug()<< "tcplistenerror:" << m_tcpserver->errorString();

    }

}

Tcp4Web::~Tcp4Web()

{

    m_tcpserver->close();

    delete m_tcpserver;

}

void Tcp4Web::onNewConnection()

{

    QTcpSocket *socket_Client= m_tcpserver->nextPendingConnection();

    m_allClinet.append(socket_Client);

    qDebug() << "new TCPconnection come.";

    connect(socket_Client, SIGNAL(readyRead()), this, SLOT(socketReaddata()));

    connect(socket_Client, SIGNAL(disconnected()), this, SLOT(socketDisconnect()));

    QByteArray data("connect ... need uersname and pwd to login");

    socket_Client->write(data, data.length());

}

void Tcp4Web::socketReaddata()

{

    QTcpSocket *socket_Client  = (QTcpSocket*)sender();

    if(m_allClinet.contains(socket_Client))

    {

        qDebug() << "m_allClinet.contains TCPconnection."<< m_allClinet.indexOf(socket_Client);

    }

    QByteArray data = socket_Client->readAll();

    QString str = data.data();

    qDebug()<< " 11111111    "<<str;

    emit dataArrive(tmpdata);

}

void Tcp4Web::socketDisconnect()

{

    QTcpSocket *socket_Client  = (QTcpSocket*)sender();

    m_allClinet.removeOne(socket_Client);

    socket_Client->deleteLater();

    qDebug()<< " deleteLater    "<<m_allClinet.size();

}

客户端

#ifndef WIDGET_H

#define WIDGET_H

#include <QWidget>

#include <QTcpSocket>

QT_BEGIN_NAMESPACE

namespace Ui { class Widget; }

QT_END_NAMESPACE

class Widget : public QWidget

{

    Q_OBJECT

public:

    Widget(QWidget *parent = nullptr);

    ~Widget();

private slots:

    void on_pushButton_clicked();

    void on_pushButton_2_clicked();

    void on_processPendingData();

private:

    Ui::Widget *ui;

    QList<QTcpSocket*> m_socketList;

};

#endif // WIDGET_H

#include "widget.h"

#include "ui_widget.h"

Widget::Widget(QWidget *parent)

    : QWidget(parent)

    , ui(new Ui::Widget)

{

    ui->setupUi(this);

}

Widget::~Widget()

{

    delete ui;

}

void Widget::on_pushButton_clicked()

{

    QTcpSocket *newSocket = new QTcpSocket(this);

    connect(newSocket, SIGNAL(readyRead()), this, SLOT(on_processPendingData()));

    newSocket->connectToHost("192.168.61.213", 6000);

    if (newSocket->waitForConnected() && newSocket->error() != QAbstractSocket::SocketTimeoutError)

    {

        m_socketList.append(newSocket);

         qDebug() << "waitForConnected OK!";

        ui->comboBox->clear();

        for(int i = 0; i < m_socketList.size(); i++)

        {

            QString str = QString("%1 Client").arg(i);

            ui->comboBox->addItem(str);

        }

        ui->comboBox->setCurrentIndex(0);

    }

    else

    {

        qDebug() << "waitForConnected failed!";

    }

}

void Widget::on_processPendingData()

{

    QTcpSocket *socket_Client  = (QTcpSocket*)sender();

    QByteArray datagram = socket_Client->readAll();

    if (datagram.size() > 0)

    {

        qDebug()<<"111111111"<<QString(datagram.data());

    }

}

void Widget::on_pushButton_2_clicked()

{

    QString str = ui->lineEdit->text();

    QByteArray ba; ba.append(str);

    m_socketList.at(ui->comboBox->currentIndex())->write(ba, ba.length());

}