76 lines
2.3 KiB
C#
76 lines
2.3 KiB
C#
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#if !NETFX_CORE
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using System;
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using System.Net;
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using System.Net.Sockets;
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using System.Threading.Tasks;
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namespace Plane.Communication
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{
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public partial class UdpThroughDtuServiceConnection
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{
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private UdpClient _client;
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/// <summary>
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/// 初始化 <see cref="UdpServerConnection"/> 的实例，并指定远程终结点和发送数据所使用的方法。
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/// </summary>
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public UdpThroughDtuServiceConnection(string ip, int port)
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{
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DtuServiceIP = ip;
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DtuServicePort = port;
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_client = new UdpClient();
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}
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/// <summary>
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/// 登陆到Dtu服务端。
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/// 登陆方式极其简单，只需发送一个数据包（内含希望连接到的飞机ID）
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/// </summary>
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/// <returns></returns>
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public virtual async Task OpenAsync()
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{
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if (!string.IsNullOrEmpty(CopterIDToBind))
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{
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_client.Connect(IPAddress.Parse(DtuServiceIP), DtuServicePort);
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var bytes = ConstructHandShakeDatagramToDTUService();
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await _client.SendAsync(bytes, bytes.Length);
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//等待服务端的应答，获取是否连接成功飞机的结果
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var result = await _client.ReceiveAsync();
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var ret = AnalyzeHandShakeDatagramFromDTUService(result.Buffer);
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if (ret == DTUHandShakeResult.Successful)
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{
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IsOpen = true;
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}
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else if (ret == DTUHandShakeResult.Occupied)
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{
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throw new Exception("飞机已被占用！");
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}
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else if (ret == DTUHandShakeResult.NotExisted)
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{
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throw new Exception("飞机不存在！");
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}
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}
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}
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public virtual void Close()
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{
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IsOpen = false;
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_client.Close();
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}
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private async Task SendAsync(byte[] datagram, int bytes)
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{
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try
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{
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await _client.SendAsync(datagram, bytes).ConfigureAwait(false);
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}
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catch (Exception ex)
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{
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Close();
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RaiseExceptionThrown(ex);
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}
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}
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}
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}
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#endif
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