/// <summary>
/// 开始异步接收数据
/// </summary>
/// <param name="key">要接收的客户端的ip地址和端口号</param>
private void ReceiveAsync(string key)
{
doReceive.Reset();
if (ListClient.ContainsKey(key))
{
UdpClient client = ListClient[key];
//if (!client.Connected)
//{
// ListClient.Remove(key);
// OnComplete(key, EnSocketAction.Close);
// return;
//}
UdpStateObject obj = new UdpStateObject
{
Client = client
};
try
{
client.Client.BeginReceive(obj.ListData, 0, obj.ListData.Length, SocketFlags.None, ReceiveCallBack, obj);
}
catch (Exception)
{
}
doReceive.WaitOne();
}
}
/// <summary>
/// 异步接收消息的回调函数
/// </summary>
/// <param name="ar"></param>
private void ReceiveCallBack(IAsyncResult ar)
{
UdpStateObject obj = ar.AsyncState as UdpStateObject;
int count = -1;
try
{
count = obj.Client.Client.EndReceive(ar);
doReceive.Set();
}
catch (Exception)
{
//如果发生异常，说明客户端失去连接，触发关闭事件
Close();
OnComplete(obj.Client, EnSocketAction.Close);
}
if (count > 0)
{
string msg = Encoding.UTF8.GetString(obj.ListData, 0, count);
if (!string.IsNullOrEmpty(msg))
{
if (Received != null)
{
IPEndPoint iep = obj.Client.Client.RemoteEndPoint as IPEndPoint;
string key = string.Format("{0}:{1}", iep.Address, iep.Port);
Received(key, msg);
}
}
}
}
/// <summary>
/// 异步接收消息
/// </summary>
private void ReceiveAsync()
{
doReceive.Reset();
UdpStateObject obj = new UdpStateObject
{
Client = client
};
client.Client.BeginReceive(obj.ListData, 0, obj.ListData.Length, SocketFlags.None, ReceiveCallBack, obj);
doReceive.WaitOne();
}
public static void StartListeningUDP()
{
// Receive a message and write it to the console.
IPEndPoint EndPoint = new IPEndPoint(IPAddress.Any, 8080);
UdpClient Client = new UdpClient(EndPoint);
UdpStateObject Net = new UdpStateObject();
Net.endPoint = EndPoint;
Net.client = Client;
// Do some work while we wait for a message.
while (true)
{
messageReceived = false;
//Console.WriteLine("Waiting for UDP conection...");
Client.BeginReceive(new AsyncCallback(ReceiveCallbackUDP), Net);
while (!messageReceived)
{
// Do something
//Thread.Sleep(16);
}
}
}
/// <summary>
/// 异步接收数据的回调函数
/// </summary>
/// <param name="ar"></param>
private void ReceiveCallBack(IAsyncResult ar)
{
UdpStateObject obj = ar.AsyncState as UdpStateObject;
int count = -1;
try
{
count = obj.Client.Client.EndReceive(ar);
}
catch (Exception)
{
if (!obj.Client.Client.Connected)
{
IPEndPoint iep = obj.Client.Client.RemoteEndPoint as IPEndPoint;
string key = string.Format("{0}:{1}", iep.Address.ToString(), iep.Port);
ListClient.Remove(key);
OnComplete(key, EnSocketAction.Close);
doReceive.Set();
return;
}
}
doReceive.Set();
if (count > 0)
{
string msg = Encoding.UTF8.GetString(obj.ListData, 0, count);
if (!string.IsNullOrEmpty(msg))
{
if (Received != null)
{
IPEndPoint iep = obj.Client.Client.RemoteEndPoint as IPEndPoint;
string key = string.Format("{0}:{1}", iep.Address.ToString(), iep.Port);
Received(key, msg);//触发接收事件
}
}
}
}