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This recipe will explain how to use the NetworkSession.BeginFind method. All other asynchronous operations in XNA follow the same principle. This recipe is the asynchronous version of recipe 8-3. In that recipe, your program started in the SignIn state and went through the SearchSession, CreateSession, and InSession states. In this recipe, you ll add the Searching state, which allows you to provide the user with information while the operation is running in the background: public enum GameState { SignIn, SearchSession, Searching, CreateSession, InSession}
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Starting the Asynchronous Operation
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The SearchSession state becomes very easy, because all it has to do is initiate the asynchronous operation: case GameState.SearchSession: { NetworkSession.BeginFind(NetworkSessionType.SystemLink, 2, null, EndAsynchSearch, null); log.Add("ASynch search started - proceed to Searching"); log.Add("Searching");
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CH A PT ER 8 N ETWO RKI NG I N XN A 2.0
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currentGameState = GameState.Searching; } break; The NetworkSession.BeginFind method will cause a second thread to be created in the background. This thread will perform the search in parallel with your main program. As a benefit, you program doesn t wait at the NetworkSession.BeginFind line as it did with the NetworkSession.Find method. Instead, it immediately continues to the Searching state. The NetworkSession.BeginFind method requires five arguments. The first three are the same as for the NetworkSession.Find method, as described in recipe 8-3. To understand the fourth argument, I ll now discuss what happens when the search in the background finishes. The second thread will call one of your methods and pass it the results. This means you have to specify which method should be called, which can be done using the fourth parameter. In this example, you instruct the second thread to call the EndAsynchSearch method when it finishes, which you can find next. The last argument allows you to identify the asynchronous operation, which can be useful in case you have multiple asynchronous operations running at the same time. See recipe 1-8 for an example of this argument.
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In the Meantime . . .
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While the search is running in the background, you re free to do whatever you want in the Searching state. In this simple example, each time the Update method is called, a dot will be added to the last line that s being printed to the screen: case GameState.Searching: { log[log.Count - 1] += "."; } break;
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NetworkSessions.EndFind
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When the second thread that s running in the background has finished its asynchronous search, it will call the method you specified as the fourth argument in the NetworkSession. BeginFind method. In the previous code, I specified the EndAsynchSearch method, which you can find here. It looks complicated, but the main part is taken from the SearchSession state of the previous recipe. private void EndAsynchSearch(IAsyncResult result) { AvailableNetworkSessionCollection activeSessions = NetworkSession.EndFind(result); if (activeSessions.Count == 0) { currentGameState = GameState.CreateSession; log.Add("No active sessions found - proceed to CreateSession"); }
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CHAPTER 8 NETWORKING IN XNA 2.0
else { AvailableNetworkSession sessionToJoin = activeSessions[0]; networkSession = NetworkSession.Join(sessionToJoin); string myString = "Joined session hosted by " + sessionToJoin.HostGamertag; myString += " with " + sessionToJoin.CurrentGamerCount.ToString() + " players"; myString += " and " + sessionToJoin.OpenPublicGamerSlots.ToString() + " open player slots."; log.Add(myString); HookSessionEvents(); currentGameState = GameState.InSession; } } The method receives the results from the asynchronous operation as the argument. For each method that begins an asynchronous operation, you can find a method that is capable of processing its results. In this case of the NetworkSession.BeginFind method, you can pass the results to the NetworkSession.EndFind method, which will process the results into an AvailableNetworkSessionCollection object. From here on, things remain identical to the previous recipe.
The Code
Here you can find the main switch block inside the Update method. This code will cause the program to move from the SignIn state to the SearchSession and Searching states. However, it will be the EndAsynchSearch method, which you can find earlier, that decides whether to move to the CreateSession or InSession state. switch (currentGameState) { case GameState.SignIn: { if (Gamer.SignedInGamers.Count < 1) { Guide.ShowSignIn(1, false); log.Add("Opened User SignIn Interface"); } else { currentGameState = GameState.SearchSession; log.Add(Gamer.SignedInGamers[0].Gamertag + " logged in - proceed to SearchSession"); } }
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