套接字中的消息错误

Question

我创建了一个基于套接字的SFML C ++程序，包括客户端和服务器。 问题是当我从客户端向服务器发送x和y坐标时，结果是意外的。服务器显示更改x和y坐标但它们不正确。请帮忙。

服务器代码：

#include <SFML\Network.hpp>
#include <SFML\Window.hpp>
#include <iostream>
#include <cstdlib>

using namespace std;
using namespace sf;

int main()
{
    float x = 0.0, y = 0.0;
    Packet packet;
    TcpListener listener;
    TcpSocket socket;
    listener.listen(26200);
    listener.accept(socket);
    cout<<"Connected to client!";
    socket.setBlocking(false);

    while(true)
    {
        if(Keyboard::isKeyPressed(Keyboard::Key::Escape)) break;
        if(socket.receive(packet) != Socket::Status::Done) continue;

        cout<<endl<<"Recieved packet";
        if( packet >> x >> y )
        {
            cout<<"\nX: "<<x<<" Y: "<<y;
            packet.clear();
        }
        packet.clear();
        system("cls");
    }
    system("pause");
    return 0;
}

客户代码：

#include <SFML\Window.hpp>
#include <SFML\Graphics.hpp>
#include <SFML\Network.hpp>
#include <iostream>

using namespace std;
using namespace sf;

int main()
{
    IpAddress ip = IpAddress::getLocalAddress();
    TcpSocket socket;
    Packet packet;

    Vector2f prevpos;

    socket.connect(ip,26200);

    cout<<"Connected to server!";

    CircleShape ball;
    ball.setPosition(400,300);
    ball.setRadius(10.0f);
    ball.setFillColor(Color::Blue);
    ball.setOrigin(2.0f,2.0f);

    sf::RenderWindow window(sf::VideoMode(800, 600), "SFML works!");

    while(true)
    {
        window.clear(Color::Black);
        prevpos = ball.getPosition();

        if(Keyboard::isKeyPressed(Keyboard::Key::Escape)) break;
        if(Keyboard::isKeyPressed(Keyboard::Key::Up)) ball.move(0.0,-1.0);
        if(Keyboard::isKeyPressed(Keyboard::Key::Down)) ball.move(0.0,1.0);
        if(Keyboard::isKeyPressed(Keyboard::Key::Left)) ball.move(-1.0,0.0);
        if(Keyboard::isKeyPressed(Keyboard::Key::Right)) ball.move(1.0,0.0);


        window.draw(ball);
        window.display();

        if(prevpos != ball.getPosition())
        {
            packet << ball.getPosition().x << ball.getPosition().y ;
            socket.send(packet);
            packet.clear();
        }
        packet.clear();
    }
    return 0;
}