QT -20230711

练习. 基于TCP聊天室的客户端

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include 
#include 
#include 

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

public:
    explicit Widget(QWidget *parent = nullptr);
    ~Widget();

private slots:
    void on_sendBtn_clicked();
    void on_connectBtn_clicked();
    void connectedSlot();
    void readInfoSlot();
    void disconnectSlot();

private:
    Ui::Widget *ui;

    QTcpSocket *socket;
    QString username;
};

#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"

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

    socket = new QTcpSocket(this);

    ui->usernameEdit->setText("kk");
    ui->ipEdit->setText("192.168.2.107");
    ui->portEdit->setText("6667");

    connect(socket, &QTcpSocket::connected, this, &Widget::connectedSlot);
    connect(socket, &QTcpSocket::readyRead, this, &Widget::readInfoSlot);
    connect(socket, &QTcpSocket::disconnected, this, &Widget::disconnectSlot);
}

//连接成功回调
void Widget::connectedSlot()
{
    QMessageBox::information(this, "提醒", "连接成功");

    QString msg = username + ":进入聊天室";
    socket->write(msg.toLocal8Bit());
}

//断开连接回调
void Widget::disconnectSlot()
{
    QMessageBox::information(this, "提醒", "断开连接成功");
}

//接收服务器信息
void Widget::readInfoSlot() {
    //判断是否有可读数据
    if (socket->bytesAvailable() != 0) {
        QString msg = QString::fromLocal8Bit(socket->readAll());
        ui->listWidget->addItem(msg);
    }
}

//Button Event
//发送按钮
void Widget::on_sendBtn_clicked()
{
    socket->write(ui->textEdit->text().toLocal8Bit());
}

//连接服务器按钮
void Widget::on_connectBtn_clicked()
{
    QString ip = ui->ipEdit->text();
    quint16 port = ui->portEdit->text().toUShort();
    username = ui->usernameEdit->text();

    if (ui->connectBtn->text() == "连接服务器") {
        //连接服务器
        socket->connectToHost(ip, port);

        ui->connectBtn->setText("断开服务器");

    } else {
        //断开服务器

        QString msg = username + ": 离开聊天室";
        socket->write(msg.toLocal8Bit());

        socket->disconnectFromHost();
        //当客户端断开后，发送disconnected的信号

        ui->connectBtn->setText("连接服务器");
    }
}




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