利用WCF的callback机制开发一个简单的多人游戏模型

本文介绍了如何利用WCF和callback机制开发一个简单的多人在线游戏模型。

运行过程如下：

当game service 启动之后，若干个客户端便会自动连接到服务器。当某个客户端点击join game时，所有客户端同时更新。

运行screenshot如下图所示：

WCF service screenshot

client1 screenshot:

client2 screenshot:

WCF service主要代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel;

namespace GameService
{
    public class PlayerEventAgrs : EventArgs
    {
       public Player player;
       public GameDesk desk;
    }


    [ServiceBehavior(InstanceContextMode=InstanceContextMode.PerSession)]
    class GameService:IGameService
    {
        static List<Player> Players=new List<Player>();
        public delegate void PlayerEventHandler(object sender, PlayerEventAgrs e);
        public static event PlayerEventHandler OnJoinGame;
        public static event PlayerEventHandler OnStartGame;

        public IPlayerCallBack callback;
       
        public GameService()
        {
            callback = System.ServiceModel.OperationContext.Current.GetCallbackChannel<IPlayerCallBack>();
            OnJoinGame += new PlayerEventHandler(GameService_OnJoinGame);
            OnStartGame += new PlayerEventHandler(GameService_OnStartGame);
              
        }


        public List<Player> GetPlayerList()
        {
            System.Threading.Thread.Sleep(4000);
            return Players;
        }

        void GameService_OnJoinGame(object sender, PlayerEventAgrs e)
        {
            Console.WriteLine("{0} is joining the game on desk NO {1}", e.player.PlayerName, e.desk.DeskNo);
            callback.OnJoin(e.player,e.desk);
        }

        void GameService_OnStartGame(object sender, PlayerEventAgrs e)
        {
            callback.OnStart(e.player);
        }
      
        public void BroadGameEvent(PlayerEventAgrs e, PlayerEventHandler temp)
        {
            if (OnJoinGame != null)
            {
                foreach (PlayerEventHandler handler in temp.GetInvocationList())
                {
                    handler.BeginInvoke(this, e, null, null);
                }
            }
        }

              
        public void JoinToGame(Player player,GameDesk desk)
        {
            Players.Add(player);    

            PlayerEventAgrs e = new PlayerEventAgrs();
            e.player = player;
            e.player.PositionNO = desk;
            e.desk = desk;
            BroadGameEvent(e, OnJoinGame);
        }

        public void StartGame(Player player)
        {
            PlayerEventAgrs e = new PlayerEventAgrs();
            e.player = player;
            BroadGameEvent(e, OnStartGame);
        }
      
    }
}

callback interface如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel;
using System.Runtime.Serialization;

namespace GameService
{
    [ServiceContract]
    public interface IPlayerCallBack
    {
        [OperationContract(IsOneWay = true)]
        void OnJoin(Player player,GameDesk gamedesk);
    
        [OperationContract(IsOneWay = true)]
        void OnStart(Player player);
    }
}

客户端callback implementation如下：

 #region CallBack Implementation
        public void OnJoin(GameService.Player player, GameService.GameDesk desk)
        {           
            int deskNo = desk.DeskNo;
            StringBuilder show = new StringBuilder();;
            show.AppendFormat("Player Information\n");
            show.AppendFormat("Player Name:{0}\n", player.PlayerName);
            show.AppendFormat("Player Status: {0}\n",player.Action);
            show.AppendFormat("Player Role: {0}\n", player.Role);

            img_Desktop.Image = new System.Drawing.Bitmap(System.Drawing.Image.FromFile(@"image\active-desktop.bmp"));                   
            switch (deskNo)
            {
                case 1:                   
                    lb_PlayerInfo1.Text = show.ToString();
                    lb_PlayerInfo1.Refresh();
                    pic_Player1.Image=new System.Drawing.Bitmap(System.Drawing.Image.FromFile(@"image\acvite-icon.bmp"));                   
                    break;
                case 2:
                    lb_PlayerInfo2.Text = show.ToString();                  
                    pic_Player2.Image = new System.Drawing.Bitmap(System.Drawing.Image.FromFile(@"image\acvite-icon.bmp"));
                    break;
                case 3:
                    lb_PlayerInfo3.Text = show.ToString();                   
                    pic_Player3.Image = new System.Drawing.Bitmap(System.Drawing.Image.FromFile(@"image\acvite-icon.bmp"));
                    break;
                
            }     
    
        }

        public void OnStart(GameService.Player player)
        {

        }
        #endregion

有关本文完整源代码，请点击此处下载