[C#.NET][TCP Socket] 接收 Alien Reader UDP 廣播封包

2012-10-12

9044
0
C#
2012-12-06

我們可以利用 Socket 類別，處理UDP廣播封包，處理的方法很簡單，步驟如下：

Step1.初始化執行個體：

Step2.用 Receive 前綴字方法接收封包：

Step3.將封包轉成字串：

encoding.GetString(receiveBuffer, 0, dataLength);

實做程式碼如下：

private bool IsReceive = true;
private List<string> _broadcastPackages = new List<string>();

public IEnumerable<string> BroadcastPackages
{
    get { return this._broadcastPackages; }
}

private void getBroadcastPackage(int UdpPort)
{
    Encoding encoding = Encoding.UTF8;
    IPEndPoint ipEndPoint = new IPEndPoint(IPAddress.Any, UdpPort);
    Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
    clientSocket.Bind(ipEndPoint);

    EndPoint endPoint = (EndPoint)ipEndPoint;
    var receiveLength = clientSocket.ReceiveBufferSize;

    byte[] receiveBuffer = new byte[receiveLength];

    try
    {
        while (IsReceive)
        {
            int dataLength = clientSocket.ReceiveFrom(receiveBuffer, ref endPoint);
            var dataPackage = encoding.GetString(receiveBuffer, 0, dataLength);

            var query = (from package in BroadcastPackages
                         where package == dataPackage
                         select package).FirstOrDefault();

            //var query = this.BroadcastPackages.Select(package => new { Package = package }).FirstOrDefault(item => item.Package == dataPackage);

            if (query == null)
            {
                this._broadcastPackages.Add(dataPackage);
            }
        }
    }
    finally
    {
        clientSocket.Close();
    }
}