QT--TCP网络编程(客户端/服务器)

QT -----TCP网络编程

 

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

 

  • 服务器
posted @ 2019-09-05 11:41  mahuifa  阅读(2798)  评论(0)  编辑  收藏  举报