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The SystemSounds class is pretty limiting in that it can produce only five specific sounds. The SoundPlayer class allows you a broader range. The following are the important things to know about the SoundPlayer class: The SoundPlayer class is a very lightweight wrapper around the Win32 PlaySound API. It can only play sound files in the pulse-code modulation (PCM) .wav format. The three operations SoundPlayer allows are starting playback, stopping playback, and changing the source of the sound file. The sound source can be a local file, a URL, an Embedded Resource (not a Resource but an Embedded Resource) or a Stream. (Stream objects are beyond the scope of this text.)
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The following code shows a simple example of using this class. It consists of creating a SoundPlayer object, specifying the location of the .wav file to play, and calling the Play method. private void Button_Click( object sender, RoutedEventArgs e ) { SoundPlayer sp = new SoundPlayer( ); Create SoundPlayer object. sp.SoundLocation = "Shuffle.wav"; Specify the location of the sound file. sp.Play(); Load and play asynchronously. } By default, the SoundPlayer object doesn t load the sound file until the Play method is called. If the file is coming from a URL and you want to load it ahead of time, you can call the LoadAsync method to preload the file. If the sound file isn t accessed through a URL, though, this command is ignored. The Play method loads the sound file asynchronously and then plays it in another thread. This means that your main thread is free to continue working as the sound plays. If you want the program to play the sound synchronously in your main thread you can use the PlaySync method. Figure 20-1 illustrates the SoundPlayer class s most important members.
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Figure 20-1. The main exposed components of the SoundPlayer class
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The SoundPlayer class isn t a WPF element and therefore can t be placed in the markup. To get around this, the WPF designers created the SoundPlayerAction class, which is a wrapper around the SoundPlayer class. SoundPlayerAction is derived from the TriggerAction class and can therefore be used as an EventTrigger. The SoundPlayerAction class has even fewer options than the SoundPlayer class. For example, it doesn t allow you to preload the .wav file, and you can t play the sound synchronously. The following markup shows the button used in the previous example, but this time, there s no event handler in the code-behind. Instead, clicking the button trips the button s EventTrigger, which contains the SoundPlayerAction element. Notice the following about the markup: The SoundPlayerAction element takes an attribute named Source, which takes the file path or URL of the .wav file. If you include the .wav file in the Visual Studio project, you can specify it as an assembly resource. I covered assembly resources in 11 but in short, after adding it to the project, you can set the file s properties in one of the following two ways: Set the file s Build Action option to Resource. This compiles it into the executable. Set the Build Action property to None, and set the Copy to Output Directory option to Copy always. This leaves the .wav file as a loose file that is copied to the output directory.
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<Grid> <Button> <Button.Triggers> <EventTrigger RoutedEvent="Button.Click"> <EventTrigger.Actions> <SoundPlayerAction Source="Shuffle.wav"/> </EventTrigger.Actions> </EventTrigger> </Button.Triggers> Click Me </Button> </Grid>
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MediaPlayer
With the SoundPlayer class, your only control over playing a sound is starting it, stopping it, or setting it to play repeatedly in a loop. The MediaPlayer class gives you much more control. The following are the important things to know about the MediaPlayer class: MediaPlayer uses components of the Windows Media Player (WMP), which must be installed on the target machine. The installed version of WMP must be version 10.0 or later. Since MediaPlayer uses components from WMP, it can use any sound file format that WMP can use. MediaPlayer gives you much greater control of sound playback. It allows you to start, stop, and set the speed of the playback. You can also set the position in the file and even adjust the balance of the left and right channels. Unlike most of the classes you ve seen in this text, the properties of the MediaPlayer class are not dependency properties, and its events are not RoutedEvents. MediaPlayer can be used only in imperative code. That is, you cannot use it in XAML.
The following code is a simple example of using the MediaPlayer class. The process consists of creating the MediaPlayer object, opening the media file using a URI, and then calling the Play method. public partial class Window1 : Window { MediaPlayer player; public Window1() { InitializeComponent(); player = new MediaPlayer(); Create the MediaPlayer object. Open the media file player.Open( new Uri( "music.wma", UriKind.Relative ) ); player.Play(); } }
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