本文介紹了如何利用WCF和callback機制開發一個簡單的多人在線游戲模型。

運行過程如下：

當game service 啟動之后，若干個客戶端便會自動連接到服務器。當某個客戶端點擊join game時，所有客戶端同時更新。

運行screenshot如下圖所示：

WCF service screenshot

client1 screenshot:

client2 screenshot:

WCF service主要代碼如下：

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);
????}
}

客戶端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

有關本文完整源代碼，請點擊此處下載

?

轉載于:https://www.cnblogs.com/Winston/archive/2008/11/02/1324885.html

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