qt tcp socket传输数据代码实例

在Qt框架中，可以使用QTcpSocket类来创建TCP套接字并进行数据传输。以下是一个简单的例子，展示了如何创建一个客户端和服务器，并通过TCP连接交换数据：

// 客户端(QTcpSocket)示例
#include <QObject>
#include <QTcpSocket>

class Client : public QObject
{
    Q_OBJECT

public slots:
    void connectToServer() {
        QTcpSocket *socket = new QTcpSocket(this);
        if (!socket->connectToHost("localhost", 8000)) { // 连接到本地服务器(假设默认IP)
            qWarning("Failed to connect: %s", socket->errorString());
            return;
        }
        
        QByteArray data = "Hello from client"; // 发送的数据
        if (socket->write(data) != data.size()) {
            qWarning("Failed to write data");
        } else {
            qDebug("Data sent successfully");
        }

        // 接收服务器响应
        QByteArray reply;
        while (socket->bytesAvailable()) {
            reply.append(socket->readAll());
        }
        qDebug("Received: %s", reply.data());
    }

private:
    ~Client() {}
};

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

    Client client;
    client.connectToServer();

    return app.exec();
}

// 服务器(QTcpServer)示例
#include <QCoreApplication>
#include <QTcpServer>

class Server : public QTcpServer
{
    Q_OBJECT

public:
    Server() : QTcpServer(this) {}

public slots:
    void incomingConnection(qintptr handle) {
        QTcpSocket *socket = new QTcpSocket(this);
        if (!accept(socket)) {
            qWarning("Failed to accept connection");
            return;
        }

        QByteArray request = socket->readAll(); // 接收客户端发送的数据
        emit newConnection(socket, request); // 管理接收请求

        socket->write("ACK received"); // 回应客户端
        delete socket;
    }

signals:
    void newConnection(QTcpSocket *client, QByteArray data);

};

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    Server server;

    if (!server.listen(QHostAddress::Any, 8000)) {
        qCritical("Listen failed: %s", server.errorString());
        return -1;
    }

    qDebug("Server started on port 8000");

    return a.exec();
}