[网络协议]Qt：udp数据的收发

直接看代码：

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

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    //分配空间，指定父对象
    udpSocket = new QUdpSocket(this);
    //绑定
    udpSocket->bind(9999);
    setWindowTitle("服务端端口为: 8887");
    //当对方成功发送数据过来 自动触发readyRead()
    connect(udpSocket, &QUdpSocket::readyRead, this, &Widget::dealMsg);
}

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

void Widget::on_sendButton_clicked()
{
    //先获取对方的IP和端口
    QString ip = ui->ipLineEdit->text();
    quint16 port = ui->portLineEdit->text().toInt();
    //获取编辑区内容
    QString str = ui->textEdit->toPlainText();
    //给指定的IP发送数据
    udpSocket->writeDatagram(str.toUtf8(), QHostAddress(ip), port);

}

void Widget::dealMsg()
{
    //读取对方发送的内容
    char buf[1024] = {0};
    QHostAddress cliAddr;  //对方地址
    quint16 port;           //对方端口
    qint64 len = udpSocket->readDatagram(buf, sizeof(buf), &cliAddr, &port);
    if(len > 0)
    {
        //格式化  [192.68.2.2:8888]aaaaa
        QString str = QString("[%1:%2] %3")
                .arg(cliAddr.toString())
                .arg(port)
                .arg(buf);
        //给编辑区设置内容
        ui->textEdit->setText(str);
    }
}

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