/// <summary>
/// 在 50050 端口向目的 IP 发送UDP信息。
/// </summary>
/// <param name="iPAddress">目标主机的 IP 地址，当填写 IPAddress.Broadcast 时即为广播。</param>
/// <param name="carrier">需要发送的信息</param>
public void UDPMessageSender(IPAddress iPAddress, string carrier)
{
Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
IPEndPoint iep1 = new IPEndPoint(iPAddress, 50050);
HostInfo hostInfo = new HostInfo();
IPEndPoint iepHost = new IPEndPoint(hostInfo.IPv4Address, 50050);
byte[] data = Encoding.UTF8.GetBytes(carrier);
socket.Bind(iepHost); //需要绑定一块活动的网卡，不然无法发送信息
socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, 1);
socket.SendTo(data, iep1);
socket.Shutdown(SocketShutdown.Send);//发送完数据后关闭socket
socket.Close();
}
/// <summary>
/// 向目的 IP 发送本机上线信息。
/// </summary>
/// <param name="iPAddress">目标主机的 IP 地址，当填写 IPAddress.Broadcast 时即为广播。</param>
/// <param name="replyStatus">广播状态字：请使用 ReplyStatus 枚举类型。</param>
/// <param name="onlineStatus">在线状态字：请使用 OnlineStatus 结构体。</param>
public void OnlineMessageSend(IPAddress iPAddress, ReplyStatus replyStatus, string onlineStatus)
{
/// 上线状态信息由以下部分组成：
/// 【本机活动的IP地址】 + 【分隔符“英文逗号 , ”】 + 【上下线状态字 UP 或 DP 】 + 【本用户17位UID】+ 【广播状态字】 + 【本用户名】
string re = "";
if (replyStatus == ReplyStatus.NeedReply)
{
re = "1";
}
else
{
re = "0";
}
HostInfo hostInfo = new HostInfo();
string carrier = hostInfo.IPv4Address.ToString() + onlineStatus.ToString() + CommonFoundations.HostUID + re + CommonFoundations.HostName;
UDPMessageSender(iPAddress, carrier);
}
/// <summary>
/// 监听端口的 TCP 信息发送。一次性使用。
/// </summary>
/// <param name="port">监听的端口号</param>
/// <returns></returns>
public string TCPMessageListener(int port)
{
HostInfo hostInfo = new HostInfo();
TcpListener tcpListener = new TcpListener(hostInfo.IPv4Address, port);//本机ip
tcpListener.Start();
string message = "";
try
{
TcpClient newClient = tcpListener.AcceptTcpClient();
using (newClient)
{
byte[] buffer = new byte[newClient.ReceiveBufferSize];//缓冲字节数组
NetworkStream clientStream = newClient.GetStream();
using (clientStream)
{
clientStream.Read(buffer, 0, buffer.Length);
message = Encoding.UTF8.GetString(buffer).Trim('\0');//收到的信息
clientStream.Close();
}
newClient.Close();
}
}
catch (Exception e)
{
return("Error!\r\n" + e.ToString());
}
finally
{
tcpListener.Stop();
}
return(message);
}