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[DllImport ("coredll.dll", EntryPoint="waveOutGetNumDevs", SetLastError=true)]

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static extern int waveOutGetNumDevs();

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Documentation

[waveOutGetNumDevs] on MSDN

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     MsgBox("Number of Wave Devices: " & waveOutGetNumDevs(), , "WAVE DEVICES")

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     For i = 0 To waveOutGetNumDevs() - 1

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        uint waveOutDevicesCount = waveOutGetNumDevs();

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    static extern uint waveOutGetNumDevs();

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static extern uint waveOutGetNumDevs();

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Declare Auto Function waveOutGetNumDevs Lib "winmm.dll" () As Integer

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Calling waveOutGetNumDevs() from Powershell:

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    public static extern uint waveOutGetNumDevs();

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   public static string waveOutGetNumDevs() {

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   System.Console.Write(wave.waveOutGetNumDevs());

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[NSMain.Wave]::waveOutGetNumDevs()

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Documentation

[waveOutGetNumDevs] on MSDN