"WAVEOUTCAPS" [http://msdn2.microsoft.com/en-us/library/ms713743(d=printer).aspx]

"Manufacturer and Product Identifiers" [http://msdn2.microsoft.com/en-us/library/ms709440.aspx]

C# Signature:

[DllImport("winmm.dll", SetLastError = true, CharSet = CharSet.Auto)]
public static extern uint waveOutGetDevCaps(IntPtr hwo,ref WAVEOUTCAPS pwoc,uint cbwoc);

VB Signature:

Declare Auto Function waveOutGetDevCaps Lib "winmm.dll" (ByVal uDeviceID as Integer, ByRef lpCaps As WAVEOUTCAPS, _
ByVal uSize As Integer) As Integer

Constants Used:

Public Const C_MAXPNAMELEN As Integer = 32
Public Const WAVE_MAPPER As Integer = -1    'Specifies default device ID

Structures Used:

VB.NET 2005 - Use the following structure: WAVEOUTCAPS

<Runtime.InteropServices.StructLayout(Runtime.InteropServices.LayoutKind.Sequential, CharSet:=Runtime.InteropServices.CharSet.Auto)> _
Public Structure WAVEOUTCAPS
     Public wMid As Short
     Public wPid As Short
     Public vDriverVersion As Integer

     <System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValTStr, SizeConst:=32)> _
     Public szPname As String

     Public dwFormats As Integer
     Public wChannels As Short
     Public wReserved As Short
     Public dwSupport As Integer
End Structure

C# 2005 version of structure
[System.Runtime.InteropServices.StructLayout(Runtime.InteropServices.LayoutKind.Sequential, CharSet = System.Runtime.InteropServices.CharSet.Auto)]
public struct WAVEOUTCAPS
{
     public short wMid;
     public short wPid;
     public int vDriverVersion;

     [MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValTStr, SizeConst = 32)]
     public string szPname;

     public int dwFormats;
     public short wChannels;
     public short wReserved;
     public int dwSupport;
}

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

Remember to have the strings marshaled as ByValTStr with size of 32.

Use "Auto" in the Declare statement to have the correct character set selected automatically.

Tips & Tricks:

Please add some!

Sample Code:

Sub ShowDeviceCaps()
     Dim i As Integer
     Dim wc As New WAVEOUTCAPS

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

     For i = 0 To waveOutGetNumDevs() - 1
         ' waveOutGetDevCaps(i, wc, Len(wc))
         waveOutGetDevCaps(i, wc, System.Runtime.InteropServices.Marshal.SizeOf(wc))  
         MsgBox("MID = " & wc.wMid & Chr(13) & "PID = " & wc.wPid & Chr(13) & "Version = " & _
         wc.vDriverVersion & Chr(13) & "Name = " & wc.szPname & Chr(13) & "Formats = " & wc.dwFormats & _
         Chr(13) & "Channels = " & wc.wChannels, , "Device ID = " & i + 1)
     Next i
End Sub

C# Code

    /// <summary>
    ///
    /// </summary>
    [StructLayout(LayoutKind.Sequential, Pack = 4, CharSet = CharSet.Auto)]
    public struct WAVEOUTCAPS
    {
        public short wMid;
        public short wPid;
        public int vDriverVersion;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
        private string szPname;
        public uint dwFormats;
        public short wChannels;
        public short wReserved;
        public uint dwSupport;

        public override string ToString()
        {
        return string.Format("wMid:{0}|wPid:{1}|vDriverVersion:{2}|'szPname:{3}'|dwFormats:{4}|wChannels:{5}|wReserved:{6}|dwSupport:{7}", new object[] { wMid, wPid, vDriverVersion, szPname, dwFormats, wChannels, wReserved, dwSupport });
        }
    }

    /// <summary>
    ///
    /// </summary>
    [StructLayout(LayoutKind.Sequential, Pack = 4, CharSet = CharSet.Auto)]
    public struct WAVEINCAPS
    {
        public short wMid;
        public short wPid;
        public int vDriverVersion;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
        public string szPname;
        public uint dwFormats;
        public short wChannels;
        public short wReserved;
        //public int dwSupport;

        public override string ToString()
        {
        return string.Format("wMid:{0}|wPid:{1}|vDriverVersion:{2}|'szPname:{3}'|dwFormats:{4}|wChannels:{5}|wReserved:{6}", new object[] { wMid, wPid, vDriverVersion, szPname, dwFormats, wChannels, wReserved });
        }
    }

    public static WAVEOUTCAPS[] GetDevCapsPlayback()
    {
        uint waveOutDevicesCount = waveOutGetNumDevs();
        if (waveOutDevicesCount > 0)
        {
        WAVEOUTCAPS[] list = new WAVEOUTCAPS[waveOutDevicesCount];
        for (int uDeviceID = 0; uDeviceID < waveOutDevicesCount; uDeviceID++)
        {
            WAVEOUTCAPS waveOutCaps = new WAVEOUTCAPS();
            waveOutGetDevCaps(uDeviceID, ref waveOutCaps, Marshal.SizeOf(typeof(WAVEOUTCAPS)));
            System.Diagnostics.Debug.WriteLine("\n" + waveOutCaps.ToString());
            list[uDeviceID] = waveOutCaps;
        }
        return list;
        }
        else
        {
        return null;
        }
    }

    public static WAVEINCAPS[] GetDevCapsRecording()
    {
        uint waveInDevicesCount = waveInGetNumDevs();
        if (waveInDevicesCount > 0)
        {
        WAVEINCAPS[] list = new WAVEINCAPS[waveInDevicesCount];
        for (int uDeviceID = 0; uDeviceID < waveInDevicesCount; uDeviceID++)
        {
            WAVEINCAPS waveInCaps = new WAVEINCAPS();
            waveInGetDevCaps(uDeviceID, ref waveInCaps, Marshal.SizeOf(typeof(WAVEINCAPS)));
            System.Diagnostics.Debug.WriteLine("\n" + waveInCaps.ToString());
            list[uDeviceID] = waveInCaps;
        }
        return list;
        }
        else
        {
        return null;
        }
    }

    [DllImport("winmm.dll", SetLastError = true, CharSet = CharSet.Auto)]
    public static extern uint waveInGetDevCaps(int hwo, ref WAVEINCAPS pwic, /*uint*/ int cbwic);

    [DllImport("winmm.dll", SetLastError = true)]
    public static extern uint waveInGetNumDevs();

    [DllImport("winmm.dll", SetLastError = true, CharSet = CharSet.Auto)]
    public static extern uint waveOutGetDevCaps(int hwo, ref WAVEOUTCAPS pwoc, /*uint*/ int cbwoc);

    [DllImport("winmm.dll", SetLastError = true)]
    static extern uint waveOutGetNumDevs();
    }

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).