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From COM.

When I press on the toolbox and choose: "Choose items" and then the tab COM I don't see "Windows Media Player" at all (supposed to be with a checkbox).

When I go to Reference=>Add reference, and choose COM I see Windows Media Player with version 1.0 and when I check its checkbox and press OK to add it it says:

A reference to "Windows Media Player" could not be added.

I'm on Windows 10 64 bit 21H1.

Is there a newer way to play MP3 files from resources and/or from a path on the hard disk?

What I have tried:

using WMPLib;

public static WindowsMediaPlayer myplayer = new WindowsMediaPlayer();
Updated 21-Dec-21 5:24am

I installed Windows Media Player from Apps & Features from Optional Features and now the old reference works and the code enters debugging without the error: "WMPLib not found" as it's found in the old reference.
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CHill60 21-Dec-21 9:02am    
Don't repost the same solution twice. Be patient - your posts both went into the moderation queue for a human to assess. We do this in our spare time and can't always respond immediately
FierceLion 21-Dec-21 9:39am    
Ok, I removed the first, thank you.
There is a System.Media.SoundPlayer class that plays sound files or streams.

It is part of System.dll under .NET FrameWork (no extra reference needed); it has been moved to System.Windows.Extensions.dll under .NET 6 (which needs you to add a reference).


you can also use P/Invoke to call on the native method sndPlaySound inside winmm.dll

The code below should give you a starting point, I use it for playing sounds from embedded resources:

/// <summary>
/// Synchronously play a sound resource from the assembly that also includes type.
/// </summary>
/// <param name="type"></param>
/// <param name="resourceName"></param>
public static void PlaySound_old(Type type, string resourceName) {
    try {
        // inspired by
        if (type == null) type = typeof(LP_Resource);
        resourceName = type.Namespace + ".resources." + resourceName;
        Stream stream = type.Assembly.GetManifestResourceStream(resourceName);
        int len = (int)stream.Length;
        byte[] buf = new byte[len];
        stream.Read(buf, 0, len);
        GCHandle handle = GCHandle.Alloc(buf);
        IntPtr ptr = Marshal.UnsafeAddrOfPinnedArrayElement(buf, 0);
        int res = sndPlaySound(ptr, 4);   // SND_MEMORY
        log("Played sound " + resourceName);
    } catch (Exception e) {
        log(resourceName + " failed: " + e.Message);

[DllImport("Winmm.dll", CharSet = CharSet.Unicode,
     CallingConvention = CallingConvention.StdCall)]
internal static extern int sndPlaySound(IntPtr buffer, int dwFlags);

Alas, that too only handles .wav sounds.


the only way I've found so far to play MP3 from C# is using WMPLib:

WMPLib.WindowsMediaPlayer player = new WMPLib.WindowsMediaPlayer();
player.URL = absoluteFilePath;;

which needs an absolute file path (like C:\...\filename.mp3) or an actual URL.
I see no way to play a sound resource, without temporarily creating a file that is.

In order to use WMPLib, one has to add a reference:
- references
- add reference
- search "Windows Media Player", the tooltip should mention C:\WINDOWS\system32\wmp.dll

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FierceLion 21-Dec-21 14:27pm    
Thx, this is only for .wav files, what about for .mp3 files?
Luc Pattyn 21-Dec-21 14:59pm    
You're right.

I've added an alternative to my original post. It is however obsolete, and also limited to .wav files.

Working on something new...

BTW: a decent mp3-to-wav converter can be found here
Luc Pattyn 21-Dec-21 15:46pm    
now see added2 (the circle is round)

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