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我想接受此端口上的UDP包:8070C# - UDP的Socket BeginReceive()(查看Ip地址)
我發送UDP數據包,我會收到另一個程序數據的程序(接收器)但我找不到發件人的IP地址! 我使用插座,我的代碼是這樣的:
Socket UdpListener = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 8070);
byte[] buf = new byte[1000];
public Form1()
{
InitializeComponent();
UdpListener.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.PacketInformation, true);
UdpListener.Bind(ipep);
}
private void button1_Click(object sender, EventArgs e)
{
UdpListener.BeginReceive(buf, 0, buf.Length, SocketFlags.None, new AsyncCallback(OnRecv), UdpListener);
}
private void OnRecv(IAsyncResult ar)
{
UdpListener.EndReceive(ar);
UdpListener.BeginReceive(buf, 0, buf.Length, SocketFlags.None, new AsyncCallback(OnRecv), UdpListener);
}
我將獲得的數據,但我怎麼能找到發送者的IP地址?
我想這:
Socket s = (Socket)ar.AsyncState;
MessageBox.Show(s.RemoteEndPoint.ToString());
,但我得到這個錯誤:
A request to send or receive data was disallowed because the socket is not connected and (when sending on a datagram socket using a sendto call) no address was supplied
感謝您的回答,我看到該鏈接並更改我的代碼MSDN示例代碼,但我得到以下錯誤「s.connect(發件人)」:「請求的地址在其上下文中無效「 –