TCP网络编程--客户端/服务器 原创

QT -----TCP网络编程

文章目录

1.主要流程
1.客户端
  • 创建QTcpSocket对象
  • 连接到服务器 --connectToHost()
  • 发送数据 —write()
  • 读取数据 —readAll()
  • 断开连接
2.服务器
  • 创建QTcpServer 对象
  • 绑定本地信息—listen(QHostAddress::Any，端口)
  • 等待客户端连接—newConnection()
  • 读取数据
  • 发送数据
  • 断开连接
2.头文件
  • 客户端：#include < QTcpSocket >
  • 服务器：#include < QTcpServer >
  • 必须要在pro文件加上-----QT += core gui network

3.代码

1.客户端

  • widget.h

    #ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QtNetwork/QTcpSocket>
#include <QKeyEvent>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT


private:
    QTcpSocket *client;
    QString *message;

    void keyPressEvent(QKeyEvent *event);
public:
    explicit Widget(QWidget *parent = nullptr);
    ~Widget();

private:
    Ui::Widget *ui;
};

#endif // WIDGET_H

  • widget.cpp

    #include "widget.h"
#include "ui_widget.h"
#include <QTextEdit>
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);

    client = new QTcpSocket(this);

    ui->Button_send->setEnabled(false);

    /*  连接服务器  */
    connect(ui->Button_connection,&QPushButton::released,this,
            [=]()
            {
                client->connectToHost(ui->lineEdit_ip->text(),ui->lineEdit_d->text().toInt());
            });
    /*  连接成功    */
    connect(client,&QTcpSocket::connected,this,
            [&]()
            {
                ui->Button_send->setEnabled(true);
                ui->label_prompt->setText("已连接");
                ui->textEdit_receive->append("连接成功……");
            });

    /* 发送到服务器 */
   connect(ui->Button_send,&QPushButton::released,this,
           [&]()
           {
               QString data = ui->textEdit_edit->toPlainText();
               if(data.length() > 0)                //如果输入框不为空才可以发送
               {
                   client->write(data.toUtf8());
                   QString data1 = "已发送："+data;
                   ui->textEdit_receive->append(data1);
               }
               else {
                   ui->textEdit_receive->append("输入信息");
               }

           });

   /*    接收信息   */
   connect(client,&QTcpSocket::readyRead,this,
           [&]()
           {
               QString msg = "收到：" + client->readAll();
               ui->textEdit_receive->append(msg);
           });


    /*  断开连接    */
    connect(ui->Button_disconnect,&QPushButton::released,this,
            [=]()
            {
                client->disconnectFromHost();
                ui->Button_send->setEnabled(false);
            });
    /*  断开连接    */
    connect(client,&QTcpSocket::disconnected,this,
            [&]()
            {
                ui->label_prompt->setText("未连接……");
                ui->textEdit_receive->append("断开连接……");
            });


}

/*    键盘事件：捕获按下回车键发送---这一部分可选择不要 */
void Widget::keyPressEvent(QKeyEvent *event)
{
    int key = event->key();
    if(key == Qt::Key_Enter)
    {
        QString data = ui->textEdit_edit->toPlainText();
        if(data.length() > 0)
        {
            client->write(data.toUtf8());
            QString data1 = "已发送："+data;
            ui->textEdit_receive->append(data1);
        }
        else {
            ui->textEdit_receive->append("输入信息");
        }

    }
}
Widget::~Widget()
{
    delete ui;
}
2.服务器

  • widget.h

    #ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QtNetwork/QTcpServer>
#include <QtNetwork/QTcpSocket>
#include <QKeyEvent>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    QTcpServer *server;
    QTcpSocket *socket;

    void new_client();
    void send_data();
    void read_data();
    void disconnect();

    void keyPressEvent(QKeyEvent *event);     //重写键盘事件虚函数，如果不要键盘发											  //送可选择删掉
public:
    explicit Widget(QWidget *parent = nullptr);
    ~Widget();

private:
    Ui::Widget *ui;
};

#endif // WIDGET_H

  • widget.cpp

    #include "widget.h"
#include "ui_widget.h"
#include <QDebug>

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

    ui->Button_send->setEnabled(false);
    server = new QTcpServer(this);

    /*  绑定绑定信息  */
    server->listen(QHostAddress::Any,ui->lineEdit_d->text().toInt());

    /*  等待客户端连接 */
    connect(server,&QTcpServer::newConnection,this,&Widget::new_client);

    /*  发送信息    */
    connect(ui->Button_send,&QPushButton::released,this,&Widget::send_data);


}

/*  等待连接    */
void Widget::new_client()
{
    qDebug() << "新客户连接";
    ui->label_prompt->setText("已连接");
    ui->textEdit_log->append("连接成功");
    ui->Button_send->setEnabled(true);
    socket = server->nextPendingConnection();
    connect(socket,&QTcpSocket::readyRead,this,&Widget::read_data);
    connect(ui->Button_disconnect,&QPushButton::released,socket,&QTcpSocket::disconnectFromHost);
    connect(socket,&QTcpSocket::disconnected,this,
            [&]()
            {
               ui->textEdit_log->append("断开连接");
            });
}
/*  发送信息  */
void Widget::send_data()
{
    QString data = ui->textEdit_edit->toPlainText();
    if(data.length() > 0)               //如果输入栏不为空才可以发送
    {
        socket->write(data.toUtf8());
        QString data1 = "已发送：" + data;
        ui->textEdit_log->append(data1);
    }
    else {
        ui->textEdit_log->append("输入信息");
    }
}

/*  接收信息    */
void Widget::read_data()
{
   // QTcpSocket *obj = (QTcpSocket*)sender();
     QString msg = "收到：" + socket->readAll();
     ui->textEdit_log->append(msg);
}

/*  断开连接    */
void Widget::disconnect()
{
    ui->textEdit_log->append("断开连接");
    ui->Button_send->setEnabled(false);
}

/*      回车键发送  -----  可选择不要 */
void Widget::keyPressEvent(QKeyEvent *event)
{
    int key = event->key();
    if(key == Qt::Key_Enter)
    {
        QString data = ui->textEdit_edit->toPlainText();
        if(data.length() > 0)                       //如果输入栏不为空才可以发送
        {
            qDebug() << data.length();
            socket->write(data.toUtf8());
            QString data1 = "已发送：" + data;
            ui->textEdit_log->append(data1);
        }
        else {
            ui->textEdit_log->append("输入信息");
        }
    }
}

Widget::~Widget()
{
    delete ui;
}

4.布局

  • 客户端
    在这里插入图片描述
  • 服务器
    在这里插入图片描述
posted @ 2023-09-04 19:11  mahuifa  阅读(0)  评论(0)  编辑  收藏  举报  来源