Playing Sounds in Visual Studio .NET

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7 Playing Sounds
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It is very easy to control the playback of a song using the MediaPlayer class. The code here will use the A button to start/resume playback and the B button to pause it:
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pad1 = GamePad.GetState(PlayerIndex.One); if (pad1.Buttons.A == ButtonState.Pressed) { if (MediaPlayer.State == MediaState.Paused) { MediaPlayer.Resume(); } if (MediaPlayer.State == MediaState.Stopped) { MediaPlayer.Play(music); } } if (pad1.Buttons.B == ButtonState.Pressed) { if (MediaPlayer.State == MediaState.Playing) { MediaPlayer.Pause(); } }
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The MediaPlayer class provides a property called State that your program can use to determine whether or not it is presently playing a song. Sample Code: 04 MusicPlayer The 04 Mus cP ayer project n the resources for th s chapter conta ns an XNA project and an mp3 mus c fi e The mus c p ayback can be started/resumed w th button A and paused w th button B When you run this program, you will notice that the first time you press button A to start the music there is quite a delay before the tune starts to play. This is because the media player has to open the media file and start playing it. The SoundEffect class uses sound samples that are held in memory and can play them instantly. You should use the media player only for background music and not when you need instant response.
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This has been an interesting chapter. You ve seen how to capture sounds and store them on your computer. You ve also discovered how to use XNA to make sounds and play music.
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Part II Images, Sound, and Text
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Review Questions
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And now the ever-popular review. Some people say that for some things in life, there are no right answers. Well, I think that for these questions, there is namely, true or false. 1. Sound in an XNA program is managed by the Content Manager. 2. Games can use .mp3 files for sound. 3. You have to copy your sound files onto your target device by hand. 4. You can play only one sound at a time in an XNA program. 5. The Play method loads a sound effect into memory. 6. The Play method does not return anything useful. 7. A null reference refers to a null object.
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8
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Creating a Timer
In this chapter, you will
Find out how your program can measure the passage of time. Create a multi-player reaction game. Use C# arrays to allow the program to determine who won.
Making Another Game
You are now going to use your knowledge of Microsoft XNA and C# to create another game. This builds on the party theme that you explored in 6, Creating a Multi-Player Game, where you created a button-bashing game.
Game Idea: Mob Reaction Timer
In this game, you test the reactions of your players. Each player is in charge of one button on a gamepad. The game plays a sound, and the player who presses his or her button the soonest after the sound starts playing wins. Anyone who presses the button before the sound starts playing is out.
You need to use a timer variable to keep track of time and a variable for each player to measure the reaction time of that player. Those variables are declared in the following code:
// Game World int timer; // Gamepad 1 scores int ascore1; int bscore1; int xscore1; int yscore1;
These are the variables for the timer and the first gamepad. The timer starts counting up from zero when the sound plays. Each time that XNA calls the Update method, the value in timer is increased by one and the program checks to see if the player has pressed his or her button. If the button has been pressed, the value of the timer is copied into the score variable for that button. The player with the lowest value is the winner. The first problem we have to solve is how to start the game. If the sound is produced as soon the game begins, the player who starts the game has an obvious advantage. One way to make this work is to make
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