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Summary

The mciGetErrorString function retrieves a string that describes the specified MCI error code.

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C# Signature:

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VB.NET Signature:

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Private Shared Function mciGetErrorString(ByVal dwError As Integer, ByVal lpstrBuffer As System.Text.StringBuilder, ByVal uLength As Integer) As Integer

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VB Signature:

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Public Declare Auto Function mciGetErrorString Lib "winmm.dll" (ByVal errorCode As Integer, ByRef errorText As StringBuilder, ByVal errorTextSize As Integer) As Integer

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VB.NET Signature:

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Private Shared Function mciSendString(ByVal command As String, ByVal buffer As StringBuilder, ByVal bufferSize As Integer, ByVal hwndCallback As IntPtr) As Integer

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VB Signature:

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Declare Ansi Function mciSendString Lib "winmm.dll" Alias "mciSendStringA" (ByVal command As String, ByRef buffer As StringBuilder, ByVal bufferSize As Integer, ByVal hWndCallback As IntPtr) As Integer

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    StringBuilder returnstring = new StringBuilder();

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    mciSendString("set CDAudio door open", returnstring,127, IntPtr.Zero);

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// Declare the notify constant

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protected override void WndProc(ref Message m)

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    base.WndProc(ref m);

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     Dim returnstring As StringBuilder = New StringBuilder()

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     mciSendString("set CDAudio door open", returnstring, 127, IntPtr.Zero)

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     MsgBox(returnstring)

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' Declare the notify constant

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     ' It's is assumed this function is in a Form so Me points to the current instance of the form

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Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)

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C# Signature:

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static extern UInt32 midiConnect(IntPtr hMidi, IntPtr hmo, IntPtr pReserved);

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Declare Function midiConnect Lib "winmm.dll" (TODO) As TODO

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     return midiConnect(midiInputHandle, midiOutputHandle, IntPtr.Zero);

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static extern UInt32 midiDisconnect(IntPtr hMidi, IntPtr hmo, IntPtr pReserved);

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Declare Function midiDisconnect Lib "winmm.dll" (TODO) As TODO

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     return midiDisconnect(midiInputHandle, midiOutputHandle, IntPtr.Zero);

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Summary

The MIDIHDR structure is used for registering buffers with the Midi Ports.

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C# Signature:

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    public uint bytesRecorded;

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    public IntPtr reserved;

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    public IntPtr[] reservedArray;

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Declare Function MIDIHDR Lib "winmm.dll" (TODO) As TODO

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    private static extern MMRESULT midiInGetDevCaps(UIntPtr uDeviceID, ref MIDIINCAPS caps, uint cbMidiInCaps);

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MMRESULT

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Summary

midiInGetNumDevs - retrieves the number of MIDI input devices in the system

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C# Signature:

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VB Signature:

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Declare Function midiInOpen Lib "winmm.dll" (TODO) As TODO

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Summary

The midiInReset function stops input on a given MIDI input device

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    static extern uint midiInReset(IntPtr hMidiIn);

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Documentation

[midiInReset] on MSDN

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Summary

The MIDIOUTCAPS structure describes the capabilities of a MIDI output device.

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    // values for wTechnology field of MIDIOUTCAPS structure

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    private const ushort MOD_SQSYNTH = 3;      // square wave internal synth

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    private const ushort MOD_WAVETABLE = 6;    // hardware wavetable synth

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    private const ushort MOD_SWSYNTH = 7;      // software synth

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    // flags for dwSupport field of MIDIOUTCAPS structure

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    private const uint MIDICAPS_STREAM = 8;      // driver supports midiStreamOut directly

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int result = midiOutGetDevCaps(deviceID, ref outCaps, Marshal.SizeOf(outCaps));

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Declare Function midiOutClose Lib "winmm.dll" (ByRef phMidiOut As IntPtr) As Uinteger

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public static extern MMRESULT midiOutGetDevCaps(UIntPtr uDeviceID, ref MIDIOUTCAPS lpMidiOutCaps, uint cbMidiOutCaps);

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MMRESULT

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           //Do whatever you want with the caps object here

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Summary

Retrieves a textual description for an error identified by the specified error code.

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C# Signature:

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static extern uint midiOutGetErrorText(uint mmrError, StringBuilder pszText, uint cchText);

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VB Signature:

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Declare Function midiOutGetErrorText Lib "winmm.dll" (TODO) As TODO

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  public string GetErrorText(uint mmrError)

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    uint uiMMResult = midiOutGetErrorText(mmrError, sb, MAXERRORLENGTH + 1);

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    if (uiMMResult != MMSYSERR_NOERROR)

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      throw new Exception(string.Format("Failed to get error text for result {0}.", mmrError));

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    return sb.ToString();

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Summary

The midiOutGetNumDevs function retrieves the number of MIDI output devices present in the system.

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Declare Function midiOutGetNumDevs Lib "winmm.dll" () As uint

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VB Signature:

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    <DllImport("winmm.dll")> Shared Function midiOutOpen(ByRef lphMidiOut As IntPtr, ByVal uDeviceID As UInteger, ByVal dwCallback As IntPtr, ByVal dwInstance As IntPtr, ByVal dwFlags As UInteger) As UInteger

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The device should be disposed with midiOutClose when not needed anymore.

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Declare Function midiOutShortMsg Lib "winmm.dll" (hMidiOut As Intptr,dwMsg As UInt32) As UInt32

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extern static Int32 midiStreamClose(IntPtr hMidiStream);

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Public Declare Function midiStreamClose Lib "winmm.dll" (ByVal hMidiStream As IntPtr) As Integer

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Documentation

[midiStreamClose] on MSDN

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C# Signature:

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extern static Int32 midiStreamOpen(ref IntPtr hMidiStream, ref Int32 puDeviceID, Int32 cMidi, IntPtr dwCallback, IntPtr dwInstance, Int32 fdwOpen);

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VB.NET Signature:

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Public Declare Function midiStreamOpen Lib "winmm.dll" (ByVal hMidiStream As IntPtr, ByVal puDeviceId As IntPtr, ByVal cMidi As Integer, ByVal dwCallback As IntPtr, ByVal dwInstance As IntPtr, ByVal fdwOpen As Integer) As Integer

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Documentation

[midiStreamOpen] on MSDN

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C# Signature:

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static extern Int32 midiStreamOut(IntPtr hMidiStream, MIDIHDR lpMidiHdr, uint cbMidiHdr);

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VB Signature:

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Declare Function midiStreamOut Lib "winmm.dll" (ByVal hMidiStream As IntPtr, ByVal lpMidiHdr As MIDIHDR, ByVal cbMidiHdr As UInteger) As Integer

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     int dwBytesRecorded;

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     IntPtr reserved;

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     IntPtr dwReserved;

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Structure MIDIHDR

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     Dim dwBytesRecorded As Integer

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     Dim reserved As IntPtr

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     Dim dwReserved As IntPtr

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End Structure

.

Documentation

[midiStreamOut] on MSDN

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static extern Int32 midiStreamPause(IntPtr hMidiStream);

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VB Signature:

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Declare Function midiStreamPause Lib "winmm.dll" (ByVal hMidiStream As IntPtr) As Integer

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Documentation

[midiStreamPause] on MSDN

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C# Signature:

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static extern TODO midiStreamPosition(TODO);

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VB Signature:

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Declare Function midiStreamPosition Lib "winmm.dll" (ByVal hms As IntPtr, ByVal pmmt As MMTIME, ByVal cbmmt As UInteger) As Integer

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Structure MMTIME

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     Structure u

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     Structure smpte

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     End Structure

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     Structure midi

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     End Structure

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     End Structure

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End Structure

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Documentation

[midiStreamPosition] on MSDN

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static extern TODO midiStreamProperty(TODO);

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Declare Function midiStreamProperty Lib "winmm.dll" (TODO) As TODO

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Documentation

[midiStreamProperty] on MSDN

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static extern Int32 midiStreamRestart(IntPtr hMidiStream);

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Documentation

[midiStreamRestart] on MSDN

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C# Signature:

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static extern Int32 midiStreamStop(IntPtr hMidiStream);

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Documentation

[midiStreamStop] on MSDN

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Declare Function mixerClose Lib "winmm.dll" (ByVal hmx As IntPtr) As Integer

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VB Signature:

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This enumeration is not yet complete. Many functions use other flags that are not included in this list. Please help to integrate it.

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C# Signature:

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   ref MixerControlDetails pmxcd, UInt32 fdwDetailsmixer);

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VB Signature:

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Declare Function mixerGetControlDetails Lib "winmm.dll" (<MarshalAs(UnmanagedType.I4)> ByVal hmxobj As Integer, ByRef pmxcd As MIXERCONTROLDETAILS, ByVal fdwDetails As Integer) As Integer

.

The winmm dll may not execute properly on 64-bit systems. Consequently, the StructLayout must be Sequential, with CharSet = Ansi, and Pack = 4. This particular type has some special layout considerations (the c union keyword) which typically means developers would use the explicit layout. However, the explicit layout breaks down on 64-bit systems for any type with an IntPtr in the type. Consequently, the C# types have been redesigned to use Sequential layout so that they will automatically adjust to 64-bit systems. This means private fields with public properties which perform the gunky work of making it look like there is a union.

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     #region Properties

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        get { return this.cbStruct; }

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        get { return this.dwControlID; }

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        get { return this.cChannels; }

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        get { return this.hwndOwner; }

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        get { return (UInt32)this.hwndOwner; }

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        get { return this.cbDetails; }

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        get { return this.paDetails; }

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     #endregion

.

The fdwDetailsmixer parameter can be composed constants from two distinct enumerations, one of which is used frequently in the winmm library, and the other constant is only used with this method. Consequently, you should wrap up the method definition so that it is easier to use, and more consistent. In the following example, the actual extern is private, while the public static method lists both enums to callers.

.

private static extern Int32 mixerGetControlDetails(IntPtr hmxobj, ref MIXERCONTROLDETAILS pmxcd, uint fdwDetails);

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public static Int32 mixerGetControlDetails(IntPtr hmxobj, ref MIXERCONTROLDETAILS pmxcd, MIXER_OBJECTF fdwDetails, MIXER_GETCONTROLDETAILSF getControlDetails)

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     return mixerGetControlDetails(hmxobj, ref pmxcd, flags);

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C# Signature:

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   private static extern uint MixerGetDevCaps(int mixerId, ref MixerCaps mixerCaps, int mixerCapsSize);

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VB Signature:

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   Private Shared Function MixerGetDevCaps(ByVal mixerId As Integer, ByRef mixerCaps As MixerCaps, ByVal mixerCapsSize As Integer) As UInteger

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MixerCaps is in Structures.MIXERCAPS

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       private static extern uint MixerGetDevCaps(int mixerId, ref MixerCaps mixerCaps, int mixerCapsSize);

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           public ushort ManufacturerID;

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           return String.Format("Manufacturer ID: {0}, Product ID: {1}, Driver Version: {2}, Product Name: \"{3}\", Support: {4}, Destinations: {5}", ManufacturerID, ProductId, Version, ProductName, Support, Destinations);

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           uint result = MixerGetDevCaps(mixerId, ref caps, Marshal.SizeOf(caps));

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           Console.ReadKey();

. .

Summary

The mixerGetID function retrieves the device identifier for a mixer device associated with a specified device handle.

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C# Signature:

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VB Signature:

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Shared Function mixerGetID(<MarshalAs(UnmanagedType.I4)> ByVal hmxobj As Integer, ByRef puMxId As UInteger, ByVal fdwId As MixerFlags) As MMRESULT

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MMRESULT

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C# Signature:

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   ref MIXERLINECONTROLS pmxlc, UInt32 fdwControls);

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VB Signature:

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Declare Function mixerGetLineControls Lib "winmm.dll" (hmxobj As IntPtr, _

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   ByRef pmxlc As MIXERLINECONTROLS, fdwControls As Integer) As Integer

.

The fdwControls parameter can be composed constants from two distinct enumerations, one of which is used frequently in the winmm library, and the other constant is only used with this method. Consequently, you should wrap up the method definition so that it is easier to use, and more consistent. In the following example, the actual extern is private, while the public static method lists both enums to callers.

.

private static extern Int32 mixerGetLineControls(IntPtr hmxobj, ref MIXERLINECONTROLS pmxlc, uint fdwControls);

.

public static Int32 mixerGetLineControls(IntPtr hmxobj, ref MIXERLINECONTROLS pmxlc, MIXER_OBJECTF mixerFlags, MIXER_GETLINECONTROLSF controlsFlags)

.

     return mixerGetLineControls(hmxobj, ref pmxlc, flags);

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C# Signature:

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   ref MIXERLINE pmxl, UInt32 fdwInfo);

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VB Signature:

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Shared Function mixerGetLineInfo(<MarshalAs(UnmanagedType.I4)> ByVal hmxobj As Integer, ByRef pmxl As MIXERLINE, ByVal fdwInfo As MixerFlags) As MMRESULT

.

MMRESULT

.

The fdwInfo parameter can be composed constants from two distinct enumerations, one of which is used frequently in the winmm library, and the other constant is only used with this method. Consequently, you should wrap up the method definition so that it is easier to use, and more consistent. In the following example, the actual extern is private, while the public static method lists both enums to callers.

.

private static extern Int32 mixerGetLineInfo(IntPtr hmxobj, ref MIXERLINE pmxl, uint fdwInfo);

.

public static Int32 mixerGetLineInfo(IntPtr hmxobj, ref MIXERLINE pmxl, MIXER_OBJECTF fdwInfo, MIXER_GETLINEINFOF fieldToFollow)

.

     return mixerGetLineInfo(hmxobj, ref pmxl, flags);

. .

Summary

Returns the number of mixer devices present.

.

C# Signature:

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VB Signature:

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Declare Function mixerGetNumDevs Lib "winmm.dll" () As UInt32

.

  Console.WriteLine("Number of mixers present: {0}", mixerGetNumDevs());

. .

Summary

Returns the number of mixer devices present.

.

C# Signature:

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VB.Net Signature:

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Public Declare Function mixerGetNumDevs Lib "winmm.dll" () As Integer

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C# Signature:

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static extern Int32 mixerOpen(ref IntPtr phmx, uint pMxId,

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VB Signature:

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Declare Function mixerOpen Lib "winmm.dll" (ByRef phmx As IntPtr, ByVal pMxId As UInteger, ByVal dwCallback As IntPtr, ByVal dwInstance As IntPtr, ByVal fdwOpen As UInteger) As Integer

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C# Signature:

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   ref MixerControlDetails pmxcd, UInt32 fdwDetails);

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VB Signature:

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Declare Function mixerSetControlDetails Lib "winmm.dll" (ByVal hmxobj As IntPtr, ByVal pmxcd As MIXERCONTROLDETAILS, ByVal fdwDetails As Integer) As Integer

.

The winmm dll may not execute properly on 64-bit systems. Consequently, the StructLayout must be Sequential, with CharSet = Ansi, and Pack = 4. This particular type has some special layout considerations (the c union keyword) which typically means developers would use the explicit layout. However, the explicit layout breaks down on 64-bit systems for any type with an IntPtr in the type. Consequently, the C# types have been redesigned to use Sequential layout so that they will automatically adjust to 64-bit systems. This means private fields with public properties which perform the gunky work of making it look like there is a union.

.

     #region Properties

.

     /// <summary>size in bytes of <see cref="MIXERCONTROL">MIXERCONTROL</see></summary>

.

        get { return this.cbStruct; }

.

        get { return this.dwControlID; }

.

        get { return (MIXERCONTROL_CONTROLTYPE)this.dwControlType; }

.

        get { return (MIXERCONTROL_CONTROLF)this.fdwControl; }

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        get { return this.cMultipleItems; }

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        get { return this.szShortName; }

.

        get { return this.szName; }

.

     #endregion

.

     //public uint dwReserved1; // Unioned with lMinimum

.

     //public uint dwReserved2; // Unioned with lMaximum

.

     private UInt32 dwReserved3;

.

     private UInt32 dwReserved4;

.

     private UInt32 dwReserved5;

.

     private UInt32 dwReserved6;

.

     #region Properties

.

        get { return this.lMinimum; }

.

        get { return this.lMaximum; }

.

        get { return (uint)this.lMinimum; }//TODO: something different

.

        get { return (uint)this.lMaximum; }//TODO: something different

.

     public UInt32 Reserved1

.

        get { return (uint)this.lMinimum; }//TODO: something different

.

     public UInt32 Reserved2

.

        get { return (uint)this.lMaximum; }//TODO: something different

.

     public UInt32 Reserved3

.

        get { return this.dwReserved3; }

.

        set { this.dwReserved3 = value; }

.

     public UInt32 Reserved4

.

        get { return this.dwReserved4; }

.

        set { this.dwReserved4 = value; }

.

     public UInt32 Reserved5

.

        get { return this.dwReserved5; }

.

        set { this.dwReserved5 = value; }

.

     public UInt32 Reserved6

.

        get { return this.dwReserved6; }

.

        set { this.dwReserved6 = value; }

.

     #endregion

.

     //private UInt32 dwReserved1; //Unioned with cSteps

.

     private UInt32 dwReserved2;

.

     private UInt32 dwReserved3;

.

     private UInt32 dwReserved4;

.

     private UInt32 dwReserved5;

.

     private UInt32 dwReserved6;

.

     #region Properties

.

        get { return this.cSteps; }

.

        get { return this.cSteps; }

.

     public UInt32 Reserved1

.

        get { return this.cSteps; }//TODO: something different

.

     public UInt32 Reserved2

.

        get { return this.dwReserved2; }

.

        set { this.dwReserved2 = value; }

.

     public UInt32 Reserved3

.

        get { return this.dwReserved3; }

.

        set { this.dwReserved3 = value; }

.

     public UInt32 Reserved4

.

        get { return this.dwReserved4; }

.

        set { this.dwReserved4 = value; }

.

     public UInt32 Reserved5

.

        get { return this.dwReserved5; }

.

        set { this.dwReserved5 = value; }

.

     public UInt32 Reserved6

.

        get { return this.dwReserved6; }

.

        set { this.dwReserved6 = value; }

.

     #endregion

.

Structure MIXERCONTROLDETAILS

.

     Structure u ' A union

.

     End Structure

.

End Structure

.

The fdwDetails parameter can be composed constants from two distinct enumerations, one of which is used frequently in the winmm library, and the other constant is only used with this method. Consequently, you should wrap up the method definition so that it is easier to use, and more consistent. In the following example, the actual extern is private, while the public static method lists both enums to callers.

.

private static extern Int32 mixerSetControlDetails(IntPtr hmxobj, ref MIXERCONTROLDETAILS pmxcd, uint fdwDetails);

.

public static Int32 mixerSetControlDetails(IntPtr hmxobj, ref MIXERCONTROLDETAILS pmxcd, MIXER_OBJECTF fdwDetails, MIXER_SETCONTROLDETAILSF setControlDetails)

.

     return mixerSetControlDetails(hmxobj, ref pmxcd, flags);

. .

Summary

Enumeration for the MMRESULT possible values in winmm.dll

.

C# Signature:

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public static enum MMRESULT : uint

.

  MMSYSERR_READERROR      = 16,

.

  WAVERR_UNPREPARED       = 34

.

VB Signature:

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Enum MMRESULT

.

  MMSYSERR_READERROR = 16

.

  WAVERR_UNPREPARED = 34

. .

Summary

Plays a PCM sound file from a filename, resource name or registry alias

.

C# Signature:

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VB Signature:

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Shared Function PlaySound( _

.

Public Declare Auto Function PlaySound Lib "winmm.dll" (ByVal pszSound As String, ByVal hmod As IntPtr, ByVal fdwSound As Integer) As Boolean

.

Public Declare Auto Function PlaySound Lib "winmm.dll" (ByVal pszSound As Byte(), ByVal hmod As IntPtr, ByVal fdwSound As SoundFlags) As Boolean

.

    /// <summary>don't stop any currently playing sound</summary>

.

    /// <summary>The pszSound parameter is an application-specific alias in the registry. You can combine this flag with the SND_ALIAS or SND_ALIAS_ID flag to specify an application-defined sound alias.</summary>

.

    /// <summary>name is a registry alias</summary>

.

    /// <summary>alias is a predefined id</summary>

.

    /// <summary>name is resource name or atom</summary>

.

    SND_RESOURCE = 0x00040004

.

    ''' The sound is played synchronously, and PlaySound returns after

.

    ''' The sound is played asynchronously and PlaySound returns

.

    ''' PlaySound returns silently without playing the default sound.

.

    ''' The sound plays repeatedly until PlaySound is called again

.

    ''' that is already playing. If a sound cannot be played because

.

    ''' the resource needed to generate that sound is busy playing

.

    ''' another sound, the function immediately returns False without

.

    ''' playing the requested sound.

.

    ''' <remarks>If this flag is not specified, PlaySound attempts

.

    ''' to stop the currently playing sound so that the device can

.

    ''' </remarks>

.

    ''' the registry. You can combine this flag with the SND_ALIAS

.

    ''' If the driver is busy, return immediately without playing

.

    ''' registry or the WIN.INI file. Do not use with either

.

    ''' SND_FILENAME or SND_RESOURCE.

.

    ''' The pszSound parameter is a resource identifier; hmod must

.

    ''' identify the instance that contains the resource.

.

    SND_RESOURCE = &H40004

.

     bool result = PlaySound(@"C:\path\to\wav\file.wav" ,ip ,0);

.

Public Shared Sub Play(ByVal strFileName As String)

.

Public Shared Sub Play(ByVal waveData As Byte()) //bad idea, see http://blogs.msdn.com/larryosterman/archive/2009/02/19/playsound-xxx-snd-memory-snd-async-is-almost-always-a-bad-idea.aspx

.

     Dim result As Boolean = PlaySound("C:\path\to\wav\file.wav", IntPtr.Zero, ip)

. .

Summary

The timeBeginPeriod function sets the minimum timer resolution for an application or device driver. Used to manipulate the timer frequency.

.

C# Signature:

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VB Signature:

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Declare Function timeBeginPeriod Lib "winmm.dll" (ByVal uPeriod As Integer) As Integer

.

  StreamWriter oWriter = null;

.

  MM_BeginPeriod(1); // set timer resolution to 1ms => freq=1000Hz

.

    oWriter = new StreamWriter(@"ticks.txt");

.

    // tickcount has resolution of 16.5ms, mmtime has 1ms

. .

Summary

The timeEndPeriod function clears a previously set minimum timer resolution

.

C# Signature:

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VB Signature:

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Declare Function timeEndPeriod Lib "winmm.dll" (ByVal uPeriod As Integer) As Integer

.

Summary

The timeGetDevCaps function queries the timer device to determine its resolution.

.

C# Signature:

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static extern UInt32 timeGetDevCaps( ref TimeCaps timeCaps,

.

VB Signature:

.

Declare Function timeGetDevCaps Lib "winmm.dll" (ByRef lpTimeCaps As TimeCaps, ByVal uSize As UInt32) As UInt32

.

http://www.pinvoke.net/default.aspx/Structures.TimeCaps

.

Returns TIMERR_NOERROR if successful or TIMERR_STRUCT if it fails to return the timer device capabilities.

. .

C# Signature:

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static extern UInt32 timeGetSystemTime( ref MmTime mmTime, UInt32 sizeMmTime );

.

VB Signature:

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Declare Function timeGetSystemTime Lib "winmm.dll" (TODO) As TODO

. .

Summary

The timeGetTime function retrieves the system time, in milliseconds. The system time is the time elapsed since Windows was started.

.

C# Signature:

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VB Signature:

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Public Shared Function MM_GetTime() As UInteger

.

Unlike Environment.TickCount, you can directly set the resolution of this timer with the TimeBeginPeriod function.

. .

C# Signature:

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static extern UInt32 timeKillEvent( UInt32 timerEventId );

.

VB Signature:

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Declare Function timeKillEvent Lib "winmm.dll" (TODO) As TODO

. .

C# Signature:

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static extern UInt32 timeSetEvent( UInt32 msDelay, UInt32 msResolution,

.

            TimerEventHandler handler, ref UInt32 userCtx, UInt32 eventType );

.

VB Signature:

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Declare Function timeSetEvent Lib "winmm.dll" (TODO) As TODO

.

TimerEventHandler

.

System.Threading.Timer

.

    static extern uint timeSetEvent(uint uDelay, uint uResolution, TimerCallback lpTimeProc, UIntPtr dwUser, uint fuEvent);

.

        GC.SuppressFinalize(this);

.

    /// The current timer instance ID

.

    /// Stop the current timer instance (if any)

.

    /// <param name="repeat">If true sets a repetitive event, otherwise sets a one-shot</param>

.

    public void Start(uint ms, bool repeat)

.

        fuEvent f = fuEvent.TIME_CALLBACK_FUNCTION | (repeat ? fuEvent.TIME_PERIODIC : fuEvent.TIME_ONESHOT);

.

        //Callback from the MMTimer API that fires the Timer event. Note we are in a different thread here

. .

C# Signature:

.

public static extern uint waveInAddBuffer(IntPtr hwi, ref WAVEHDR pwh, uint cbwh);

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Shared Function waveInAddBuffer(<MarshalAs(UnmanagedType.I4)> ByVal hwi As Integer, ByVal pwh As IntPtr, ByVal cbwh As UInteger) As MMRESULT

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Shared Function waveInAddBuffer(<MarshalAs(UnmanagedType.I4)> ByVal hwi As Integer, ByRef pwh As WAVEHDR, ByVal cbwh As UInteger) As MMRESULT

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MMRESULT

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When recording waveform audio, usually buffers are allocated with unmanaged functions and kept in an IntPtr() array; for this reason the function is provided in two versions, one processing a WAVEHDR ByRef and the other working with an IntPtr.

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Shared Function waveInClose(<MarshalAs(UnmanagedType.I4)> ByVal hwi As Integer) As MMRESULT

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MMRESULT

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Shared Function waveInGetNumDevs() As UInteger

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        CALLBACK_THREAD = 0x20000,

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        WAVE_FORMAT_DIRECT = 8

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  CALLBACK_THREAD = &H20000

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  WAVE_FORMAT_DIRECT = 8

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  CALLBACK_THREAD = &H20000

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  WAVE_FORMAT_DIRECT = 8

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static extern TODO waveInPrepareHeader3(TODO);

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Declare Function waveInPrepareHeader3 Lib "winmm.dll" (TODO) As TODO

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Documentation

[waveInPrepareHeader3] on MSDN

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Summary

The waveInReset function stops input on the given waveform-audio input device and resets the current position to zero.

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static extern uint waveInReset(IntPtr hwi);

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Shared Function waveInReset(<MarshalAs(UnmanagedType.I4)> ByVal hwi As Integer) As MMRESULT

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MMRESULT

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Documentation

[waveInReset] on MSDN

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Shared Function waveInStart(<MarshalAs(UnmanagedType.I4)> ByVal hwi As Integer) As MMRESULT

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MMRESULT

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Summary

The waveInUnprepareHeader function cleans up the preparation performed by the waveInPrepareHeader function.

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static extern MMRESULT waveInUnprepareHeader(IntPtr hwi, ref WAVEHDR pwh, uint cbwh);

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Shared Function waveInUnprepareHeader(<MarshalAs(UnmanagedType.I4)> ByVal hwi As Integer, ByVal pwh As IntPtr, ByVal cbwh As UInteger) As MMRESULT

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Shared Function waveInUnprepareHeader(<MarshalAs(UnmanagedType.I4)> ByVal hwi As Integer, ByRef pwh As WAVEHDR, ByVal cbwh As UInteger) As MMRESULT

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MMRESULT

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Documentation

[waveInUnprepareHeader] on MSDN

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Declare Auto Function waveOutClose Lib "winmm.dll" (ByVal hwo As IntPtr) As UInteger

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Summary

The waveOutGetDevCaps function fills the WAVEOUTCAPS structure with wave device capabilities.

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

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public static extern uint waveOutGetDevCaps(IntPtr hwo,ref WAVEOUTCAPS pwoc,uint cbwoc);

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

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Structures Used:

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VB.NET 2005 - Use the following structure: WAVEOUTCAPS

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Public Structure WAVEOUTCAPS

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     Public wReserved As Short

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End Structure

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C# 2005 version of structure

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     public short wReserved;

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

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

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        public short wReserved;

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        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 });

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        public short wReserved;

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        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 });

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            waveOutGetDevCaps(uDeviceID, ref waveOutCaps, Marshal.SizeOf(typeof(WAVEOUTCAPS)));

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        return list;

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        return null;

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    public static WAVEINCAPS[] GetDevCapsRecording()

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            waveInGetDevCaps(uDeviceID, ref waveInCaps, Marshal.SizeOf(typeof(WAVEINCAPS)));

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        return list;

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        return null;

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    public static extern uint waveInGetDevCaps(int hwo, ref WAVEINCAPS pwic, /*uint*/ int cbwic);

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    public static extern uint waveOutGetDevCaps(int hwo, ref WAVEOUTCAPS pwoc, /*uint*/ int cbwoc);

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Summary

The waveOutGetErrorText function retrieves a textual description of the error identified by the given error number.

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      /// This function gets a string describing the error returned from one of the wave functions.

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      /// <param name="mmrError">The error code</param>

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      /// <param name="pszText">String returning the text description</param>

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      /// <returns>NOERROR success, otherwise fail.</returns>

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      private static extern uint waveOutGetErrorText(uint mmrError, StringBuilder pszText, uint cchText);

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      /// This function gets a string describing the error returned from one of the wave functions.

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      /// <param name="mmrError">The error code</param>

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      /// <returns>The description</returns>

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      public static string waveOutGetErrorText(int mmrError)

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        uint errorResult = waveOutGetErrorText(mmrError, message, (uint)message.Capacity);

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        if (errorResult == 0)

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          return message.ToString();

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          return "waveOutGetErrorText failed.";

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Declare Function waveOutGetErrorText Lib "winmm.dll" (TODO) As TODO