c++基于qt写一个udp收发消息-QT开发中文网

以下是一个简单的基于Qt的UDP消息收发示例：

#include <QtGui>
#include <QtNetwork>

class UdpSender : public QWidget
{
    Q_OBJECT

public:
    UdpSender(QWidget *parent = 0);

private slots:
    void sendMessage();

private:
    QLabel *statusLabel;
    QPushButton *sendButton;
    QLineEdit *messageLineEdit;
    QUdpSocket *udpSocket;
};

UdpSender::UdpSender(QWidget *parent)
    : QWidget(parent)
{
    setWindowTitle(tr("UDP Sender"));

    statusLabel = new QLabel(tr("Ready to send messages."));
    sendButton = new QPushButton(tr("&Send"));
    messageLineEdit = new QLineEdit;

    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(statusLabel);
    layout->addWidget(messageLineEdit);
    layout->addWidget(sendButton);

    setLayout(layout);

    udpSocket = new QUdpSocket(this);

    connect(sendButton, SIGNAL(clicked()), this, SLOT(sendMessage()));
}

void UdpSender::sendMessage()
{
    QByteArray data;
    data.append(messageLineEdit->text());

    udpSocket->writeDatagram(data, QHostAddress::LocalHost, 12345);

    statusLabel->setText(tr("Sent message: %1").arg(messageLineEdit->text()));
    messageLineEdit->clear();
}

class UdpReceiver : public QDialog
{
    Q_OBJECT

public:
    UdpReceiver(QWidget *parent = 0);

private slots:
    void processPendingDatagrams();

private:
    QLabel *statusLabel;
    QUdpSocket *udpSocket;
};

UdpReceiver::UdpReceiver(QWidget *parent)
    : QDialog(parent)
{
    setWindowTitle(tr("UDP Receiver"));

    statusLabel = new QLabel(tr("Ready to receive messages."));

    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(statusLabel);

    setLayout(layout);

    udpSocket = new QUdpSocket(this);
    udpSocket->bind(QHostAddress::LocalHost, 12345);

    connect(udpSocket, SIGNAL(readyRead()), this, SLOT(processPendingDatagrams()));
}

void UdpReceiver::processPendingDatagrams()
{
    while (udpSocket->hasPendingDatagrams()) {
        QByteArray datagram;
        datagram.resize(udpSocket->pendingDatagramSize());

        QHostAddress sender;
        quint16 senderPort;

        udpSocket->readDatagram(datagram.data(), datagram.size(),
                                &sender, &senderPort);

        statusLabel->setText(tr("Received message: %1").arg(QString(datagram)));
    }
}

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    UdpSender sender;
    UdpReceiver receiver;
    receiver.show();
    sender.show();

    return app.exec();
}

#include "main.moc"

这个示例程序包括一个UDP消息发送器和一个UDP消息接收器。当发送器发送一条消息时，接收器会显示该消息的文本内容。在这个示例中，我们使用本地主机地址和端口号12345来进行通信。如果您希望实现更复杂的功能（例如通过网络连接到其他计算机），则需要相应地修改代码。