"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>
/// typedef struct {
/// WORD wMid;
/// WORD wPid;
/// MMVERSION vDriverVersion;
/// TCHAR szPname[MAXPNAMELEN];
/// DWORD dwFormats;
/// WORD wChannels;
/// WORD wReserved1;
/// DWORD dwSupport;
///} WAVEOUTCAPS;
/// </summary>
[System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential, Pack = 4)]
public struct WAVEOUTCAPS
{
public short wMid;
public short wPid;
public int vDriverVersion;
[System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst = 32)]
public char[] 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, new string(szPname), dwFormats, wChannels, wReserved, dwSupport });
//return base.ToString();
}
}
/// <summary>
/// typedef struct {
/// WORD wMid;
/// WORD wPid;
/// MMVERSION vDriverVersion;
/// TCHAR szPname[MAXPNAMELEN];
/// DWORD dwFormats;
/// WORD wChannels;
/// WORD wReserved1;
/// } WAVEINCAPS;
/// </summary>
[System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential, Pack = 4)]
public struct WAVEINCAPS
{
public short wMid;
public short wPid;
public int vDriverVersion;
[System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst = 32)]
public char[] 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, new string(szPname), dwFormats, wChannels, wReserved });
//return base.ToString();
}
}
public static WavePlayerLib.WAVEOUTCAPS[] GetDevCapsPlayback()
{
int waveOutDevicesCount = WavePlayerLib.WaveNative.waveOutGetNumDevs();
if (waveOutDevicesCount > 0)
{
WavePlayerLib.WAVEOUTCAPS[] list = new WAVEOUTCAPS[waveOutDevicesCount];
for (int uDeviceID = 0; uDeviceID < waveOutDevicesCount; uDeviceID++)
{
WavePlayerLib.WAVEOUTCAPS waveOutCaps = new WavePlayerLib.WAVEOUTCAPS();
WavePlayerLib.WaveNative.waveOutGetDevCaps(uDeviceID, ref waveOutCaps, System.Runtime.InteropServices.Marshal.SizeOf(typeof(WavePlayerLib.WAVEOUTCAPS)));
System.Diagnostics.Debug.WriteLine("\n" + waveOutCaps.ToString());
list[uDeviceID] = waveOutCaps;
}
return list;
}
else
{
return null;
}
}
public static WavePlayerLib.WAVEINCAPS[] GetDevCapsRecording()
{
int waveInDevicesCount = WavePlayerLib.WaveNative.waveInGetNumDevs();
if (waveInDevicesCount > 0)
{
WAVEINCAPS[] list = new WAVEINCAPS[waveInDevicesCount];
for (int uDeviceID = 0; uDeviceID < waveInDevicesCount; uDeviceID++)
{
WavePlayerLib.WAVEINCAPS waveInCaps = new WavePlayerLib.WAVEINCAPS();
WavePlayerLib.WaveNative.waveInGetDevCaps(uDeviceID, ref waveInCaps, System.Runtime.InteropServices.Marshal.SizeOf(typeof(WavePlayerLib.WAVEINCAPS)));
System.Diagnostics.Debug.WriteLine("\n" + waveInCaps.ToString());
list[uDeviceID] = waveInCaps;
}
return list;
}
else {
return null;
}
}
