MyKits/UDP/widget.cpp

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

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    //1.创建对象
    udpSocket = new QUdpSocket(this);

}

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

void Widget::on_btnOpen_clicked()
{
    //2.打开连接
    //判断是否成功
    if(udpSocket->bind(ui->editLocalPort->text().toUInt()) == true){
        QMessageBox::information(this,"提示","成功");
    }else{
        QMessageBox::critical(this,"提示","失败");
    };
    //3.连接成功触发函数
    connect(udpSocket,SIGNAL(readyRead()),this,SLOT(readyRead()));
}

void Widget::readyRead(){
    //3.槽函数,读取数据
    while(udpSocket->hasPendingDatagrams()){    //判断是否有数据
        QByteArray ary;
        ary.resize(udpSocket->pendingDatagramSize());
        udpSocket->readDatagram(ary.data(),ary.size());

        QString buff;
        buff = ary.data();
        ui->editMessageRCV->appendPlainText(buff);
    }
}

void Widget::on_btnSend_clicked()
{
    //4.发送数据
    //数据
    QString sendBuff;
    sendBuff = ui->editMessageSend->text();
    //ip
    QHostAddress addr;
    addr.setAddress(ui->editTargetIP->text());
    //端口
    quint16 port;
    port = ui->editTargetPort->text().toUInt();
    //发送数据
    udpSocket->writeDatagram(sendBuff.toLocal8Bit().data(),sendBuff.length(),addr,port);
}

void Widget::on_btnClose_clicked()
{
    //5.关闭
    udpSocket->close();
    QMessageBox::information(this,"提示","已关闭");
}