C++ day5

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

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
    , server(new QTcpServer(this)) // 实例化服务器对象
{
    ui->setupUi(this);
}

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

void Widget::on_startButton_clicked()
{
    // 获取界面输入的端口号
    quint16 port = ui->PortLineEdit->text().toUInt();

    // 设置服务器为监听状态: 监听任意客户端（主机）
    int ret = server->listen(QHostAddress::Any, port);
    if(ret == true)
    {
        QMessageBox::information(this, "", "启动服务器成功");
    }
    else
    {
        QMessageBox::information(this, "", "启动服务器失败");
        return;
    }

    // 新客户端连接信号 连接 槽函数
    connect(server, &QTcpServer::newConnection, this, &Widget::connectSlot);
}

void Widget::connectSlot()
{
    // 获取新连接客户端的socket
    QTcpSocket *clientSocket = server->nextPendingConnection();

    // 将客户端socket对象存入链表中
    socketList.push_back(clientSocket);

    // 客户端发送数据信号 连接 窗口
    connect(clientSocket, &QTcpSocket::readyRead, this, &Widget::readySlot);
}

void Widget::readySlot()
{
    int ret;
    // 遍历客户端链表，移除无效客户端
    for(int i = 0; i < socketList.count(); ++i)
    {
        ret = socketList.at(i)->state();
        if(ret == QTcpSocket::UnconnectedState)
        {
            socketList.removeAt(i);
        }
    }

    // 遍历客户端链表，判断哪个客户端发送了消息
    for(int i = 0; i < socketList.count(); ++i)
    {
        // 会阻塞等待
        ret = socketList.at(i)->bytesAvailable();
        if(ret > 0)
        {
            // 读取数据
            QByteArray msg = socketList.at(i)->readAll();

            // 将读取到的数据发送到窗口
            ui->listWidget->addItem(QString::fromLocal8Bit(msg));

            // 将数据广播给所有客户端（除了发送此消息的客户端）
            for(int j = 0; j < socketList.count(); ++j)
            {
                if(i == j)continue;
                socketList.at(j)->write(msg);
            }
        }
    }
}