Unity多人联机框架Mirro学习记录（一）

NetworkServer中注册事件RegisterHandler

主要是注册服务端使用的事件

   // message handlers 
        /// <summary>Register a handler for message type T. Most should require authentication.</summary>
        // TODO obsolete this some day to always use the channelId version.
        // all handlers in this version are wrapped with 1 extra action.
        public static void RegisterHandler<T>(Action<NetworkConnectionToClient, T> handler, bool requireAuthentication = true)
            where T : struct, NetworkMessage
        {
    
            ushort msgType = MessagePacking.GetId<T>();
            if (handlers.ContainsKey(msgType))
            {
    
                Debug.LogWarning($"NetworkServer.RegisterHandler replacing handler for {
      typeof(T).FullName}, id={
      msgType}. If replacement is intentional, use ReplaceHandler instead to avoid this warning.");
            }
            handlers[msgType] = MessagePacking.WrapHandler(handler, requireAuthentication);
        }

使用方法如下：
先设计传输的数据

  public struct TestServerMessage: NetworkMessage
    {
    
        public string message;
    }

在服务端注册事件，注意一定要在服务端，事件格式如下所示

NetworkServer.RegisterHandler<TestServerMessage>(OnTestServerMessage);

public void OnTestServerMessage(NetworkConnectionToClient conn, TestServerMessage msg)
{
    
 Debug.Log(msg.message);
}

然后发送事件，客户端使用Send发送事件，发送给服务端执行，而不是发送给其他客户端

 NetworkClient.Send(new TestServerMessage {
     message="我来了"});

NetworkClient.Send() 函数

主要是发送数据给服务端，调用注册的服务端函数

    // send 
        /// <summary>Send a NetworkMessage to the server over the given channel.</summary>
        public static void Send<T>(T message, int channelId = Channels.Reliable)
            where T : struct, NetworkMessage
        {
    
            if (connection != null)
            {
    
                if (connectState == ConnectState.Connected)
                {
    
                    connection.Send(message, channelId);
                }
                else Debug.LogError("NetworkClient Send when not connected to a server");
            }
            else Debug.LogError("NetworkClient Send with no connection");
        }

NetworkConnectionToClient中的Send函数

主要是向该连接的客户端发送消息，例如我在服务端保存了所有客户端NetworkConnectionToClient，可以通过该客户端的Send函数执行对应的事件

 // Send stage one: NetworkMessage<T>
        /// <summary>Send a NetworkMessage to this connection over the given channel.</summary>
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public void Send<T>(T message, int channelId = Channels.Reliable)
            where T : struct, NetworkMessage
        {
    
            using (NetworkWriterPooled writer = NetworkWriterPool.Get())
            {
    
                // pack message and send allocation free
                MessagePacking.Pack(message, writer);
                NetworkDiagnostics.OnSend(message, channelId, writer.Position, 1);
                Send(writer.ToArraySegment(), channelId);
            }
        }

例如在服务器端运行的OnServerConnect函数中，检测到一旦有客户端加入，就会执行该函数，conn为加入函数的客户端NetworkConnectionToClient 。

public override void OnServerConnect(NetworkConnectionToClient conn){
    }

创建一个客户端使用的传输数据

    public struct TestClientMessage : NetworkMessage
    {
    
        public string message;
    }

注册该事件，每个客户端都要注册，如果出现客户端没有注册该事件，但是仍然发送数据过去，就会出现下面这个错误，因为NetworkClient没有注册该事件，所以会出现该问题

一般注册在OnStartClient函数中

public override void OnStartClient(){
    
	NetworkClient.RegisterHandler<TestClientMessage>(OnTestClientMessage);
}
public void OnTestClientMessage(TestClientMessage msg)
{
    
	Debug.Log(msg.message);
}

注册完成之后，进行发送调用

public override void OnServerConnect(NetworkConnectionToClient conn){
    
 conn.Send(new TestClientMessage {
     message=conn.connectionId+"发来消息"});
}