UDP File Transfer Using Qt

To send and receive files using the UDP protocol in Qt, you can achieve it by following these steps:

1. Instantiate a QUdpSocket object for UDP communication by creating it in the constructor of a class.

QUdpSocket *udpSocket = new QUdpSocket(this);

1. You can set the port number and binding address for UDP listening in the class constructor.

udpSocket->bind(QHostAddress::Any, 1234);

1. You can send file data by using the writeDatagram method of QUdpSocket, like this:

QFile file("file.txt");
if (file.open(QIODevice::ReadOnly)) {
    while (!file.atEnd()) {
        QByteArray data = file.read(1024);
        udpSocket->writeDatagram(data, QHostAddress::LocalHost, 1234);
    }
}
file.close();

1. To receive file data, you can use the readyRead signal and readDatagram method of QUdpSocket to receive data.

connect(udpSocket, SIGNAL(readyRead()), this, SLOT(readPendingDatagrams()));

void MyClass::readPendingDatagrams()
{
    while (udpSocket->hasPendingDatagrams()) {
        QByteArray datagram;
        datagram.resize(udpSocket->pendingDatagramSize());
        udpSocket->readDatagram(datagram.data(), datagram.size());
        
        // 处理接收到的文件数据
    }
}

By following the steps above, you can send and receive file data using UDP protocol in Qt. It is important to note that in real-world applications, additional file transfer control information may need to be added to ensure the integrity and accuracy of the file.