使用UDP套接字实现简单的通信

来源：互联网发布：锋云搜歌文件生成软件编辑：程序博客网时间：2024/06/05 19:31

先看下效果图：

server端，只能接收数据：http://blog.chinaunix.net/photo/116111_101004192628.jpg

client端，发送数据，并显示在上面的text中：

http://blog.chinaunix.net/photo/116111_101004192710.jpg

代码实现：

server端代码：

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

this->setWindowTitle("QQ2011-UDP");

//绑定套接字

    udpSocket = new QUdpSocket;
    udpSocket->bind(QHostAddress("219.229.140.239"), 8888);
    QObject::connect(udpSocket, SIGNAL(readyRead()), this, SLOT(processReadData()));
}

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

void server::changeEvent(QEvent *e)
{
    QMainWindow::changeEvent(e);
    switch (e->type()) {
    case QEvent::LanguageChange:
        ui->retranslateUi(this);
        break;
    default:
        break;
    }
}

//socket有数据可读时触发的槽函数

void server::processReadData()
{
    time = QDateTime(QDateTime::currentDateTime());
    QString timeString = time.toString("hh:mm:ss");
    ui->messagetextEdit->append(timeString);

    qint64 size = udpSocket->pendingDatagramSize();
    qDebug()<<"size = " <<size;
    char data[size];
    udpSocket->readDatagram(data, size, 0, 0);
    QByteArray array(data, size);
    QString datastring(array);
    ui->messagetextEdit->append(datastring);
}

client端代码：

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

this->setWindowTitle("QQ2011-UDP");

//绑定套接字

udpSocket = new QUdpSocket;
udpSocket->bind(QHostAddress("219.229.140.239"), 9999);
}

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

void client::changeEvent(QEvent *e)
{
    QMainWindow::changeEvent(e);
    switch (e->type()) {
    case QEvent::LanguageChange:
        ui->retranslateUi(this);
        break;
    default:
        break;
    }
}

//send按钮槽函数

void client::on_sendButton_clicked()
{
this->processSendMessage();
}

//message发送的处理函数

void client::processSendMessage()
{
    if (ui->sendMessagetextEdit->toPlainText().isEmpty() == false)
    {
        time = QDateTime(QDateTime::currentDateTime());
        QString timeString = time.toString("hh:mm:ss");
        ui->messagetextEdit->append(timeString);

        QString senderName = "farsight:\n";
        QByteArray arrayData((senderName + ui->sendMessagetextEdit->toPlainText()).toAscii());
        udpSocket->writeDatagram(arrayData, QHostAddress("219.229.140.239"), 8888);
        QString datastring(ui->sendMessagetextEdit->toPlainText());
        qDebug()<<"size" <<arrayData.size();
        ui->messagetextEdit->append(datastring);
        ui->sendMessagetextEdit->clear();
    }
    else
    {
        QMessageBox::information(this, "ERROR Message", "please input message to send");
    }
}