Qt Udp QBuffer代码

以下是使用Qt中的QUdpSocket和QBuffer类实现UDP数据传输的示例代码：

// 创建QUdpSocket对象
QUdpSocket *socket = new QUdpSocket(this);

// 创建QBuffer对象
QBuffer *buffer = new QBuffer(this);
buffer->open(QIODevice::ReadWrite);

// 写入数据到buffer中
QByteArray data;
data.append("Hello World!");
buffer->write(data);

// 将buffer中的数据发送到指定的IP和端口号
QHostAddress address("127.0.0.1");
quint16 port = 1234;
socket->writeDatagram(buffer->data(), address, port);

// 接收数据
connect(socket, SIGNAL(readyRead()), this, SLOT(onReadyRead()));
void MyClass::onReadyRead()
{
    while (socket->hasPendingDatagrams()) {
        QByteArray datagram;
        datagram.resize(socket->pendingDatagramSize());
        QHostAddress sender;
        quint16 senderPort;

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

        // 处理接收到的数据
        qDebug() << "Received datagram:" << datagram;
    }
}

// 关闭socket和buffer
socket->close();
buffer->close();
delete socket;
delete buffer;

注意：在实际使用中，应该根据需要设置socket和buffer的属性和选项。此外，需要注意在发送和接收数据时，数据的大小和格式必须匹配。