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How to: Play Sounds 

This example demonstrates using platform invoke to play two WAV files, one as an embedded resource and the other as content.

To implement your WAV file as an embedded resource in Microsoft Visual Studio 2005, in the Properties pane, set its Build Action property to "Embedded Resource." If you are compiling at the command line, see How to: Compile at the Command Prompt for information about compiling an embedded resource.

This example defines the Sound class that provides the following native code functionality using CoreDll.dll in Windows CE:

  • Platform invoke method declarations to play a sound using a file name or a stream.

  • An enumeration of bit values for passing arguments in the platform invoke method call.

  • A Play method that calls the correct platform invoke method to play a separate file or embedded resource.

This example uses a sound file named Chimes.wav. When you include the sound file as an embedded resource, you must return the resource stream for the file by prepending the assembly namespace to the original file name in the call to GetManifestResourceStream.

To play sounds using Platform Invoke

  1. Add the Sound class to your projects.

    public class Sound
    {
        private byte[] m_soundBytes;
        private string m_fileName;
    
        private enum Flags {
            SND_SYNC = 0x0000,  /* play synchronously (default) */
            SND_ASYNC = 0x0001,  /* play asynchronously */
            SND_NODEFAULT = 0x0002,  /* silence (!default) if sound not found */
            SND_MEMORY = 0x0004,  /* pszSound points to a memory file */
            SND_LOOP = 0x0008,  /* loop the sound until next sndPlaySound */
            SND_NOSTOP = 0x0010,  /* don't stop any currently playing sound */
            SND_NOWAIT = 0x00002000, /* don't wait if the driver is busy */
            SND_ALIAS = 0x00010000, /* name is a registry alias */
            SND_ALIAS_ID = 0x00110000, /* alias is a predefined ID */
            SND_FILENAME = 0x00020000, /* name is file name */
            SND_RESOURCE = 0x00040004  /* name is resource name or atom */
        }
    
        [DllImport("CoreDll.DLL", EntryPoint="PlaySound", SetLastError=true)]
        private extern static int WCE_PlaySound(string szSound, IntPtr hMod, int flags);
    
        [DllImport("CoreDll.DLL", EntryPoint="PlaySound", SetLastError=true)]
        private extern static int WCE_PlaySoundBytes (byte[] szSound, IntPtr hMod, int flags);
    
        /// <summary>
        /// Construct the Sound object to play sound data from the specified file.
        /// </summary>
        public Sound (string fileName) {
            m_fileName = fileName;
        }
    
        /// <summary>
        /// Construct the Sound object to play sound data from the specified stream.
        /// </summary>
        public Sound(Stream stream)    {
            // read the data from the stream
            m_soundBytes = new byte [stream.Length];
            stream.Read(m_soundBytes, 0,(int)stream.Length);
        }
    
        /// <summary>
        /// Play the sound
        /// </summary>
        public void Play () {
            // if a file name has been registered, call WCE_PlaySound,
            //  otherwise call WCE_PlaySoundBytes
            if (m_fileName != null)
                WCE_PlaySound(m_fileName, IntPtr.Zero, (int) (Flags.SND_ASYNC | Flags.SND_FILENAME));
            else
                WCE_PlaySoundBytes (m_soundBytes, IntPtr.Zero, (int) (Flags.SND_ASYNC | Flags.SND_MEMORY));
        }
    }
    
    
  2. Add methods to create an instance of the Sound class and to play a file, such as in a button's Click event.

    // To return a Stream object associated with an embedded
    // resource, you must prepend the namespace to the original
    // name of the file in the project.
    private void btnEmbedded_Click(object sender, System.EventArgs e) {
        Sound sound = new Sound (Assembly.GetExecutingAssembly().GetManifestResourceStream("SoundSample.chimes.wav"));
        sound.Play();
    }
    
    private void btnFile_Click(object sender, System.EventArgs e) {
        Sound sound = new Sound ("Program Files\\SoundSample\\chord.wav");
        sound.Play();
    }
    
    

Compiling the Code

This example requires references to the following namespaces:

See Also

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