qt 簡單UDP編程

dialog.h

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <QUdpSocket>

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT

public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();

    QUdpSocket *m_udp;

private slots:
    void on_pushButton_send_clicked();

    void reciveData();

private:
    Ui::Dialog *ui;
};

#endif // DIALOG_H

dialog.cpp

#include "dialog.h"
#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog)
{
    ui->setupUi(this);
    m_udp = new QUdpSocket(this);//創建socket套接字
    m_udp->bind(8000);//綁定端口8000
    connect(m_udp,SIGNAL(readyRead()),this,SLOT(reciveData()));//建立接收數據的信號槽
}

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

void Dialog::on_pushButton_send_clicked()
{
    QString msg = ui->lineEdit->text();
    if(!msg.isEmpty())
    {
        m_udp->writeDatagram(msg.toUtf8(),QHostAddress("127.0.0.1"),7000);//發送數據
    }
}

void Dialog::reciveData()
{
    while (m_udp->hasPendingDatagrams())
    {
        quint32 size = m_udp->pendingDatagramSize();
        QByteArray buf(size,0);//size是buf大小，0是初始化數據
        QHostAddress ip;
        quint16 port;
        m_udp->readDatagram(buf.data(),buf.size(),&ip,&port);//接收數據
        ui->textEdit->append("[" + ip.toString() + ":" + QString::number(port) + "] " + buf);
    }
}

main.cpp

#include "dialog.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Dialog w;
    w.show();
    return a.exec();
}