Qt(进阶3)

Qt下的TCP通信过程

代码实现

界面展示

服务器端

1. 在.pro文件中加入

   QT += network

2. server.h

   #ifndef SERVER_H
   #define SERVER_H
   #include <QWidget>
   #include <QTcpServer>
   #include <QTcpSocket>
   namespace Ui {
   class Server;
   }
   class Server : public QWidget
   {
    Q_OBJECT
   public:
    explicit Server(QWidget *parent = nullptr);
    ~Server();
   private slots:
    void on_pushButton_clicked();
   
    void on_pushButton_2_clicked();
   private:
    Ui::Server *ui;
    QTcpServer *tcpServer;
    QTcpSocket *tcpSocket;
   };
   #endif // SERVER_H

3. server.cpp

   #include "server.h"
   #include "ui_server.h"
   Server::Server(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Server)
   {
    ui->setupUi(this);
    tcpServer = NULL;
    tcpSocket = NULL;
    tcpServer = new QTcpServer(this);//监听套接字
    tcpServer ->listen(QHostAddress::Any,8888);//监听，指定端口
    setWindowTitle("服务器:8888");
    connect(tcpServer,&QTcpServer::newConnection,[=](){
        //取出创建好连接的套接字
        tcpSocket = tcpServer->nextPendingConnection();
        //获取对方的IP、端口
        QString ip= tcpSocket->peerAddress().toString();
        qint16 port=tcpSocket->peerPort();
        QString temp = QString("[%1:%2]:成功连接.").arg(ip).arg(port);
        ui->read_edit->setText(temp);
   
        connect(tcpSocket,&QTcpSocket::readyRead,[=](){
            QByteArray array = tcpSocket->readAll();
            ui->write_edit->setText(array); //服务器发送来的信息写在write_edit里
   
        });
    });
   }
   Server::~Server()
   {
    delete ui;
   }
   void Server::on_pushButton_clicked()
   {
    if(NULL == tcpSocket){
        return;
    }
    QString str = ui->write_edit->toPlainText();
    //给客户端发送数据
    tcpSocket->write(str.toUtf8().data());
   }
   void Server::on_pushButton_2_clicked()
   {
    if(tcpSocket == NULL){
        return;
    }
    //主动与客户端断开连接、
    tcpSocket->disconnectFromHost();
    tcpSocket->close();
    tcpSocket=NULL;
   }

客户端

1. client.h

   #ifndef CLIENT_H
   #define CLIENT_H
   #include <QTcpSocket>
   #include <QWidget>
   namespace Ui {
   class Client;
   }
   class Client : public QWidget
   {
    Q_OBJECT
   public:
    explicit Client(QWidget *parent = nullptr);
    ~Client();
   private slots:
    void on_pushButton_3_clicked();
   
    void on_pushButton_clicked();
   
    void on_pushButton_2_clicked();
   private:
    Ui::Client *ui;
    QTcpSocket *tcpSocket;
   };
   #endif // CLIENT_H

2. client.cpp

   #include "client.h"
   #include "ui_client.h"
   #include <QHostAddress>
   Client::Client(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Client)
   {
    ui->setupUi(this);
   }
   Client::~Client()
   {
    delete ui;
   }
   void Client::on_pushButton_3_clicked()
   {
    tcpSocket= NULL;
    tcpSocket = new QTcpSocket(this);
    connect(tcpSocket,&QTcpSocket::connected,[=](){
        ui->textEdit->setText("成功与服务器建立连接");
    });
    connect(tcpSocket,&QTcpSocket::readyRead,[=](){
        QByteArray array = tcpSocket->readAll();
        ui->textEdit_2->setText(array);//将服务器发送的内容写在textEdit_2中
    });
   //获取服务器IP和端口
    QString ip = ui->ip_line->text();
    qint16 port = ui->port_line->text().toInt();
    //主动与服务器建立连接
    tcpSocket->connectToHost(QHostAddress(ip),port);
   }
   void Client::on_pushButton_clicked()
   {
    QString str = ui->textEdit_2->toPlainText();
    tcpSocket->write(str.toUtf8().data());//给服务器端发送信息
   }
   void Client::on_pushButton_2_clicked()
   {
    tcpSocket->disconnectFromHost();
    tcpSocket->close();
   }